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Nways Multiprotocol Access Services Software User's Guide Version 3.3


Configuring and Monitoring LAN Emulation Clients

This chapter describes how to configure LAN Emulation Clients (LECs). It includes the following sections:


Configuring LAN Emulation Clients

This section summarizes and explains the commands for configuring and using the set of LE Clients on a particular ATM interface.

To get to the LE Client Config> prompt, enter le-c at the ATM Config> prompt as described in "ATM Configuration Commands".

Enter the commands at the LE Client Config> prompt under the ATM Config> prompt, as described in "ATM Configuration Commands".

Table 45. LAN EMULATION Client Configuration Commands Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 Add   Adds a LEC for the following types of ATM Forum-compliant Emulated LANs architectures: 
  • Ethernet
  • Token Ring
 Config   Gets you to the LEC Config> prompt, from which you can configure a specific LAN Emulation Client. 
 List   Lists the LEC. 
 Remove   Removes a LEC. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

Add

Use the add command to add a LEC for a Token-Ring or Ethernet emulated LAN.

Syntax:

add
Ethernet

Token Ring

token-ring
Token-ring emulated LAN

Example: add token ring

  LE Client Config> add token-ring
  Added Emulated LAN as interface 3

ethernet
Ethernet emulated LAN

Example: add ethernet

  LE Client Config> add ethernet
  Added Emulated LAN as interface 2

Config

Use the config command to get you to the LEC Config> prompt, from which you can configure the details of a specific LAN Emulation Client.

Syntax:

config
interface#

interface#
An integer number assigned by the router when the LEC was added to the configuration. Use the list command to determine the interface number assigned to the LEC.

Example: config

  LE Client Config> config 3
  ATM LAN Emulation Client configuration
 

List

Use the list command to list the LAN emulation clients.

Syntax:

list

Example:

  LE Client Config> list
                   ATM Forum Compliant Emulated LANs
  ------------------------------------------------------
    Physical ATM interface number = 0
    LEC interface number = 1
    Emulated LAN type    = Token Ring Forum Compliant
    Emulated LAN name    =

Remove

Use the remove command to remove a LEC. You must specify the interface number that was assigned when the LEC was added to the configuration. Use the list command to determine the interface number assigned to the LEC.

Syntax:

remove
interface#

interface#
An integer number assigned by the router.

Configuring an ATM Forum-Compliant LE Client

Use this process to access the appropriate LEC Config> prompt.:

  1. Use the config command at the LE Client Config> prompt to access the appropriate LEC interface number, or use the network configuration command with the appropriate LEC interface number.

  2. Enter the appropriate commands at either the Ethernet Forum Compliant LEC Config> prompt or the Token Ring Forum Compliant LEC Config> prompt. Commands in the following table apply to both Token-Ring and Ethernet LECs except where indicated.

This section explains the commands for configuring an ATM Forum-compliant LAN Emulation Client.

Table 46. LAN Emulation Client Configuration Commands Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 ARP-Configuration   Allows you to configure the LE-ARP configuration for the ATM Forum-compliant client 
 Frame   Sets the NetWare IPX encapsulation type. 
 IP-Encapsulation   Sets the IP encapsulation as Ethernet (type X'0800') or IEEE (802.3 with SNAP). Applies only to Ethernet LECs. 
 List   Lists the LAN Emulation Client configuration. 
 LLC   Accesses the LLC Config> configuration prompt for Token Ring LECs. 
 QoS-Configuration   Gets you to the elan-x LEC QoS Config> prompt from which you can configure Quality of Service as described in LE Client QoS Configuration Commands in Using and Configuring Features
 RIF-Timer   Sets the maximum amount of time that information in the RIF is maintained before it is refreshed. Applies only to Token-Ring LECs. 
 Set   Sets the LAN Emulation Client parameters. 
 Source-routing   Used to enable or disable source-route bridging. Applies only to Token-Ring LECs. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

ARP Configuration

Use the arp-configuration command to configure the static LE-ARP entries for the ATM forum-compliant LAN Emulation Client.

Syntax:

arp-configuration
 

Example:

Token Ring Forum Compliant LEC Config> arp-configuration
ATM LAN Emulation Clients ARP configuration
 


Table 47. ATM LAN Emulation Client ARP Configuration Commands Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 Add   Adds an LE-ARP cache entry using a MAC or route descriptor ARP. 
 Config   Sets cache entry QoS parameter values. 
 List   Lists configured ARP cache entries. 
 Remove   Removes an ARP cache entry. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

Add

Use the add command to add an ARP cache entry using the MAC address or a route descriptor.

MAC addresses, and route descriptors are entered as strings of hexadecimal characters with or without optional separator characters between bytes. Valid separator characters are dashes (-), periods (.), or colons (:).

Syntax:

add
mac

route-descriptor

Example 1:

ARP config for LEC>add mac
MAC address of LE ARP Entry []? 123456789098
ATM address in 00.00.00.00.00.00:... form []? 390f000000000000000000000000123456789098
Destination Type -  REMOTE or LOCAL [Remote]? 

Example 2:

ARP config for LEC>add route 12.34
ATM address in 00.00.00.00.00.00:... form []? 390f000000000000000000001234567890988888
ARP config for LEC>

Config

Use the Config command to configure the permanent ARP cache entry QoS parameters for the ATM forum-specific LAN Emulation Client.

Syntax:

config
arp-entry-number

Example:

ARP config for LEC> config
ARP entry number [1]
Configure LEC ARP entry

Table 48. ATM LAN Emulation Client ARP Config Commands Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 Set   Sets QoS parameter values. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

Set   

Use the Set command to configure the permanent ARP cache entry QoS parameters for the ATM forum-specific LAN Emulation Client.

Syntax:

set
max-reserved-bandwidth
traffic-type
peak-cell-rate
sustained-cell-rate
qos-class
max-burst-size

Example:

ARP entry 'identifier' config> set ?
 MAX-RESERVED-BANDWIDTH
 TRAFFIC-TYPE
 PEAK-CELL-RATE
 SUSTAINED-CELL-RATE
 QOS-CLASS
 MAX-BURST-SIZE

See Configuring and Monitoring Quality of Service (QoS) in Using and Configuring Features for detailed information about the QoS parameters.

List

Use the list command to display information about ARP configuration.

Remove

Use the remove command to remove an configured MAC address or Route Descriptor LE-ARP entry.

Select the ARP entry number to be removed from the list provided.

Syntax:

remove
arp-entry-number

Frame

Use the frame command to set the NetWare IPX encapsulation type. The command options differ depending on the type of LEC (Token-Ring or Ethernet). For Token-Ring LECs, enter one of the following:
 Option   Description   Syntax 
 Token-Ring using MSB   Uses the standard 802.2 IPX header with the noncanonical Token-Ring address bit ordering (MSB).   frame token-ring msb 
 Token-Ring using LSB   Uses the 802.2 IPX header with the canonical address bit ordering (LSB).   frame token-ring lsb 
 Token-Ring with 802.2 SNAP using MSB   Uses the 802.2 format with a SNAP header and noncanonical address bit ordering. This encapsulation is used primarily in bridging environments.   frame token-ring_snap msb 
 Token-Ring with 802.2 SNAP using LSB   Uses the 802.2 format with a SNAP header and canonical address bit ordering.   frame token-ring_snap lsb 
 Ethernet 2.0   Uses Ethernet version 2.0 protocol 81-37.   frame ethernet_II 
 Ethernet 802.2   Uses Ethernet 802.3 with 802.2 SA E0.    frame ethernet_8022 
 Ethernet 802.3   Uses Ethernet 802.3 without any 802.2 header.   frame ethernet_802.3 
 Ethernet SNAP   Uses 802.3, 802.2 with SNAP PID 00-00-00-81-37.   frame ethernet_SNAP 

Syntax:

frame
ipx-encapsulation type
Note:The frame command cannot be used in the network configuration process to set the IPX encapsulation unless the interface has been configured with IPX.

The IPX encapsulation can also be set in the IPX configuration environment. Refer to the Protocol Configuration and Monitoring Reference chapter on Configuring IPX for details.

Example:

frame token_ring msb

IP-Encapsulation (for Ethernet ATM Forum-Compliant LEC only)

Use the IP-encapsulation command to select Ethernet (Ethernet type X'0800') or IEEE 802.3 (Ethernet 802.3 with SNAP). Specify either type Ethernet or IEEE-802.3.

Syntax:

IP-encapsulation
Ethernet

IEEE-802.3

List

Use the list command to list the LE client configuration.

Syntax:

list

LLC

Logical Link Control can be thought of as a "sub-protocol". It is not accessed directly from either the Talk 6 (configuration) or the Talk 5 (console) environment. Instead, it is accessed from the Token Ring LEC configuration menu by entering an LLC command.

Use the llc command to access the LLC Config> prompt. See"LLC Configuration Commands" for more information.

Syntax:

llc

QoS

Use the qos-configuration command to get you to the LEC QoS Config> prompt from which you can configure Quality of Service as described in LE Client QoS Configuration Commands in Using and Configuring Features.

Syntax:

qos-configuration
 

RIF-Timer (for Token-Ring Forum-compliant LEC only)

Use the RIF-Timer command to set the maximum amount of time that information in the RIF is maintained before it is refreshed. Range is 0 to 4096. The default is 120 seconds.

Syntax:

rif-timer
value

Example:

rif-timer 100

Set

Use the set command to set LE Client parameters.

Syntax:

set
arp-aging-time

 
arp-cache-size

 
arp-queue-depth

 
arp-response-time

 
auto-config

 
best-effort-peakrate

 
bus-connect-retries

 
conn-completion-time

 
control-timeout

data-direct-timeout

data-direct-vcc-mode

 
elan-name

 
esi-address

 
flush-timeout

 
forward-delay

 
forward-disconnect-timeout

 
frame-size

 
initial-control-timeout

 
lecs-atm-address

 
les-atm-address

 
mac-address

 
multicast-send-avg

 
multicast-send-peak

 
multicast-send-type

 
multiplier-control-timeout

 
path-switch-delay

 
reconfig-delay-min

 
reconfig-delay-max

 
retry-count

 
selector

 
trace

 
unknown-count

 
unknown-time

 
vcc-timeout

arp-aging-time
Sets ARP aging time. This is the maximum time that a LEC will maintain an entry in its LE_ARP cache in the absence of a verification of that relationship. A larger aging time may result in a faster session setup time, but may also use more memory and reacts slower to changes in network configuration.

Valid Values:
An integer number of seconds in the range of 10 to 300.

Default Value:
300

Example:

   LEC Config> set arp-aging-time 200

arp-cache-size
Sets the number of entries in the ARP cache. The size of the ARP cache limits the number of simultaneous data direct VCCs. Larger ARP caches require more memory, but permit the client to simultaneously converse with a larger number of destinations.

Valid Values:
An integer number in the range of 10 to 65535.

Default Value:
5000

Example:

  LEC Config> set arp-cache-size 10

arp-queue-depth
Sets the maximum number of queued frames per ARP cache entry. The LEC enqueues frames when switching the data path from the Multicast Send VCC to a Data Direct VCC. Frames passed to the LEC for transmission will be discarded if the queue is full. A larger queue requires more memory, but results in fewer discarded frames during the data path switch.

Valid Values:
An integer number in the range of 0 to 10.

Default Value:
5

Example:

  LEC Config> set arp-queue-depth 10

arp-response-time
Sets expected ARP response time. This value controls how frequently an unanswered LE ARP request is retried. Larger values result in fewer LE ARPs, which causes less traffic and possibly increase the amount of time before a Data Direct VCC is established.

Valid Values:
An integer number of seconds in the range of 1 to 30.

Default Value:
1 second

Example:

  LEC Config> set arp-response-time 20

auto-config
Specifies whether this LEC uses LECS auto-config mode. Specify YES or NO. The LEC may contact the LECS to obtain the address of its LES and various other configuration parameters.

Valid Values:
If YES, then you do not have to configure the ATM address of the LES.

If NO, then you must configure the ATM address of the LES using the set les-atm-address command as described on page ***.

Default Value:
NO

Example:

  LEC Config> set auto-config yes

best-effort-peakrate
Sets the Best Effort Peak Rate. Used when establishing best effort multicast send connections.

The maximum peak rate depends on the maximum data rate of the ATM device.

Specify an integer from 1 to the maximum peak rate in Kbps (the definition is the maximum data rate) as follows:

Valid Values:
An integer number in the range of 1 - device maximum data rate.

Default Value:
155000

Example:

  LEC Config> set best-effort-peakrate 24000

bus-connect-retries
This parameter sets the maximum number of times that the LEC will attempt to reconnect to the BUS before returning to the initial state.

Valid Values:
0 - 2

Default Value:
1

connection-completion-time
Sets the connection completion time. This is the time interval in which data or a READY_IND message is expected from a calling party.

When a Data Direct VCC is established to the client, the LEC expects data or a READY_IND message within this time period. The LEC will not transmit frames over a Data Direct VCC established to it until receiving data or a READY_IND. This parameter value controls the amount of time which passes before the LEC issues a READY QUERY (in hopes of receiving a READY_IND). Smaller values lead to faster response times, but also to unnecessary transmissions.

Valid Values:
An integer number of seconds in the range of 1 to 10.

Default Value:
4

Example:

  LEC Config> set connection-completion-time 5

control-timeout
This parameter sets the maximum cumulative control timeout of a request.

A current timeout value is initialized to the value of initial-control-timeout. If a response to a request is not received within the current timeout value, the current timeout is multiplied by the value of the multiplier-control-timeout and the request is reissued. Each time the current timeout value expires, this process is repeated until the current timeout value exceeds the value of control-timeout.

Valid Values:
An integer number of seconds in the range of 10 to 300.

Default Value:
30

Example:

  LEC Config> set control-timeout 100

data-direct-timeout
Specifies the timeout value for the data direct VCC. This parameter limits the time the Data Direct VCCs are left up without the LEC having a connection to the LES/BUS. If the LEC rejoins a LES/BUS before the timer expires, the time is stopped.

Valid Values:
10 - 300 seconds

Default Value:
30

data-direct-vcc-mode
Specifies whether persistent Data Direct VCC mode is enabled or disabled. When the Data Direct VCC mode is enabled, if the LEC loses its connection to the LES/BUS, the Data Direct VCCs are not dropped and the reconnect timeout timer is started. The LEC will continue to try to reconnect to the LES/BUS. If the LEC cannot reconnect to the LES/BUS before the data-direct-timeout expires, all Data Direct VCCs will be disconnected.

Valid Values:
yes or no

Default Value:
no

elan-name
Specifies name of the ELAN that the LEC wishes to join. This is the ELAN name sent to the LECS in the configure request (if the LEC autoconfigures) or to the LES in the join request. The LECS or LES may return a different ELAN name in the response.

Valid Values:
Any character string length of 0 - 32 bytes.

Default Value:
Blank
Note:A blank name (0 length string) is valid.

Example:

  LEC Config> set elan-name FUZZY

esi-address
Sets the ESI portion of the LEC's ATM address.

Specify the ESI portion (octets 13 through 19) of the LEC's ATM address. The ESI and selector combination of the LEC must be unique among all LAN emulation components on the device.

Valid Values:
Any 12 hexadecimal digits.

Default Value:
Burned-in ESI

Example:

  set esi
  Select ESI
     (1) Use burned in ESI
     (2) 11.22.33.44.55.66
 
  Enter selection [1]?

flush-timeout
Sets the flush timeout. This is the time limit to wait to receive the LE_FLUSH_RESPONSE after the LE_FLUSH_REQUEST has been sent before taking recovery action. During recovery, any queued frames are dropped and a new flush request is sent.

When switching from the multicast send to a data direct data path, the client sends a flush request over the multicast send VCC. Until a flush response is received, or until the path switch delay expires, frames are queued for the destination.

Valid Values:
An integer number of seconds in the range of 1 to 4.

Default Value:
4

Example:

  LEC Config> set flush-timeout 3

forward-delay
Sets the forward delay. Entries in the LE ARP cache must be periodically re-verified. The forward delay time is the maximum amount of time a remote entry may remain in the cache during a network topology change. Larger aging times may result in stale (invalid) entries, but also cause less re-verification traffic.

Valid Values:
An integer number of seconds in the range of 4 to 30.

Default Value:
15

Example:

  LEC Config> set forward-delay 10

forward-disconnect-timeout
This parameter sets the amount of time that a LEC will wait after losing its last Multicast Forward VCC from the BUS before returning to the initial state. This delay permits the BUS to attempt to reconnect to the client without returning to the initial state.

Valid Values:
10 - 300 seconds

Default Value:
60

frame-size
Sets the frame size.

The value specified for frame-size must be equal to or less than the value specified for ATM max-frame using the ATM INTERFACE> set max-frame command as described on page ***.

Valid Values:
1516

4544

9234

18190

Default Value:
If the ELAN type is token ring, the default is 4544. If the ELAN type is Ethernet, the default is 1516.

Example:

  LEC Config> set frame-size 4544

initial-control-timeout
This parameter sets the value of the initial control timeout used in the control timeout algorithm described in ***.

Valid Values:
1 - 10

Default Value:
5

Example:

  LEC Config> set initial-control-timeout 10

lecs-atm-address
Specifies the ATM address of the LECS.

If the client is set to auto configure, it attempts to connect to a LECS. If it is unable to connect to a LECS, then it may try another LECS ATM address. The LECS ATM addresses that are tried, in order, are:

  1. This configured LECS address
  2. Any LECS address obtained through ILMI
  3. The well-known LECS address defined by the ATM Forum.

No default is provided.
Note:This command should be entered on one command line. It is shown here on two lines because of spacing.

Example:

  LEC Config> set lecs-atm-address
39.84.0F.00.00.00.00.00.00.00.00.00.01.10.00.5A.00.DE.AD.01

les-atm-address
Sets the LES ATM address. This command may be optional or required depending upon the setting of lecs-auto-config as described in the set auto-config command on page ***.

Specify the ATM address of the LES. No default is provided.
Note:This command should be entered on one command line. It is shown here on two lines because of spacing.

Example:

  LEC Config> set les-atm-address
        39.84.0F.00.00.00.00.00.00.00.00.00.01.10.00.5A.00.DE.AD.02

mac-address
Sets the MAC address for this LE client. You may specify that the client use the burned-in MAC address of the ATM interface, or you may specify a different MAC address. If you have two clients that are bridged together, they should use different MAC addresses.

This MAC address is registered with the LES when the client joins the ELAN.

Valid Values:
Any valid MAC address.

Default Value:
none

Example:

  LEC Config> set mac-address
    Use adapter address for MAC? [No]
    MAC address []: 10.00.5a.00.00.01

multicast-send-avg
Sets the multicast send VCC average rate in Kbps. Used by the LEC for reserving bandwidth on the VCC to the BUS. It specifies the forward and backward sustained cell rate used when setting up a reserved bandwidth multicast send VCC.

This parameter is only applicable when the multicast-send-type is reserved bandwidth. If multicast-send-avg equals multicast-send-peak, then a constant bit rate (CBR) multicast send is signalled. Otherwise, a variable bit rate (VBR) multicast send is signalled. Multicast-send-avg must be less than or equal to multicast-send peak.

A reserved bandwidth multicast send VCC may improve data transfer rates in congested networks, but reserving bandwidth and not using it wastes network resources.

When the multicast-send-type is reserved, then multicast-send-avg and multicast-send-peak must be specified.

Example:

  LEC Config> set multicast-send-avg 4000

multicast-send-peak
Sets the multicast send peak rate in Kbps. Used by LEC for reserving bandwidth on the VCC to the BUS. It specifies the forward and backward peak cell rate used when establishing a reserved bandwidth multicast send VCC.

This parameter is only applicable when the multicast-send-type is reserved bandwidth. If multicast-send-avg equals multicast-send-peak, then a constant bit rate (CBR) multicast send is signalled. Otherwise, a variable bit rate (VBR) multicast send is signalled. Multicast-send-avg must be less than or equal to multicast-send peak.

A reserved bandwidth multicast send VCC may improve data transfer rates in congested networks, but reserving bandwidth and not using it wastes network resources.

When the multicast-send-type is reserved, then multicast-send-avg and multicast-send-peak must be specified.

Example:

  LEC Config> set multicast-send-peak 155

multicast-send-type
Sets the multicast send type. Specifies the method used by the LEC when establishing the multicast send VCC.

If multicast-send-avg equals multicast-send-peak, then a constant bit rate (CBR) multicast send is signalled. Otherwise, a variable bit rate (VBR) multicast send is signalled. Multicast-send-avg must at least equal multicast-send peak.

A reserved bandwidth multicast send VCC may improve data transfer rates in congested networks, but reserving bandwidth and not using it wastes network resources.

When the multicast-send-type is reserved, then multicast-send-no and multicast-send-peak must be specified.

Valid Values:
Best Effort or Reserved

Default Value:
Best Effort

Example:

  LEC Config> set multicast-send-type best-effort

multiplier-control-timeout
This parameter sets the value of the control timeout multiplier used in the control timeout algorithm described on page ***.

Valid Values:
2 - 5

Default Value:
2

Example:

  LEC Config> set multiplier-control-timeout 5

path-switch-delay
Sets the path switch delay.

The LEC must ensure that all frames sent through the BUS to a destination have arrived at the destination before it can start using a Data Direct VCC. This is accomplished using the flush protocol, or by waiting path-switch-delay seconds after sending the last packet to the BUS. Smaller values improve performance, but may result in out-of-order packets in a heavily congested network.

Valid Values:
An integer number of seconds in the range of 1 to 8.

Default Value:
6

Example:

  LEC Config> set path-switch-delay 5

reconfig-delay-min
This parameter sets the minimum delay time when LEC returns to the initial state. This value must be <= reconfig-delay-max.

Valid Values:
1 - the value of reconfig-delay-max

Default Value:
1

Example:

  LEC Config> set reconfig-delay-min  5

reconfig-delay-max
This parameter sets the maximum delay time when LEC returns to the initial state. This value must be >= reconfig-delay-min.

Valid Values:
1 - 10

Default Value:
5

Example:

  LEC Config> set reconfig-delay-max 9

retry-count
Sets the retry count. This is maximum number of times that the LEC retries an LE_ARP_REQUEST for a specific frame's LAN destination. If no ARP response is received after the specified number of retries, then the entry is purged from the LE ARP cache.

Valid Values:
0, 1, or 2

Default Value:
1

Example:

  LEC Config> set retry-count 2

selector
Specifies the selector portion of the client's ATM address. The combination of ESI and selector must be unique among all LANE components on the device. By default, a unique selector is selected for the configured ESI.

Valid Values:
Any octet, in hexadecimal, that is not in use by another LANE component with the same ESI.

Example:

  LEC Config> set selector 01

trace
Enables tracing for the LEC. To perform packet tracing, three steps are required:
  1. Enable packet tracing system (under ELS)
  2. Enable tracing on the LEC subsystem (under ELS)
  3. Enable packet tracing on the desired LECs (using this command).

Valid Values:
Yes or No

Default Value:
No

Example:

  Token Ring LEC config>set trace
  Trace packets on the LEC? [No]?yes

unknown-count
Sets the unknown frame count. This is the maximum number of frames for a specific unicast MAC address or route descriptor that may be sent to the BUS within the time specified by the unknown-time parameter. Larger values decrease the number of discarded frames while increasing the load on the BUS.

Valid Values:
An integer number of frames in the range of 1 to 255.

Default Value:
10

unknown-time
Sets the unknown frame time. This is the time interval during which the maximum number of frames for a specific unicast MAC address or route descriptor (specified by the unknown-count parameter) may be sent to the BUS. Larger values increase the number of discarded frames while decreasing the load on the BUS.

Valid Values:
An integer number of seconds in the range of 1 to 60.

Default Value:
1

Example:

  LEC Config> set unknown-time 5

vcc-timeout
Sets the VCC timeout. Data direct VCCs over which no traffic has been sent for this period of time should be released.

Valid Values: 0 to 31536000 seconds (1 year).

Default Value: 1200
Note:This parameter is meaningful only for SVC connections.

Example:

  LEC Config> set vcc-timeout 1000

Source-Routing (for Token-Ring Forum-Compliant LEC only)

Use the source-routing command to enable or disable end station source-routing. Source routing is the process by which end stations determine the source route to use to cross source routing bridges. Source routing allows the IP, IPX, and AppleTalk Phase 2 protocols to reach nodes on the other side of the source route bridge.

This function of the device is not changed whether source routing is enabled or disabled. The default setting is enabled.

Some stations cannot properly receive frames with Source Routing RIF on them. This is especially common among NetWare drivers. Disabling source routing in this situation will allow you to communicate with these stations.

Source routing should be enabled only if there are source-routing bridges on this ring through which you want to bridge IP, IPX, and AppleTalk Phase 2 packets. Source routing must also be enabled so that LLC test response messages can be returned.

Syntax:

source-routing
enable

disable

Example:

source-routing disable

LLC Configuration Commands

This section summarizes and then explains all of the LLC commands. These commands, shown in Table 49, let you monitor the LLC while passing packets over an SNA network.

Table 49. LLC Command Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 List   Displays configuration information. 
 Set   Allows the user to dynamically configure LLC parameters that are valid for the life of the session. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

List

Use the list command to display configuration information.

Syntax:

list

Set

Use the set command to dynamically configure the LLC parameters on a current LLC session. Any changes that you make to the parameters are effective for the life of session.

Attention:   Changing LLC parameters from the default can affect how the LLC protocol works.

Syntax:

set
n2-max_retry count

n3-frames-rcvd-before-ack count

nw-acks-to-inc-ww count

rw-receive-window seconds

t1-reply-timer seconds

t2-receive-ack-timer seconds

ti-inactivity-timer seconds

tw-transmit-window seconds

n2-max_retry
The maximum number of retries by LLC protocol. For example, N2 is the maximum number of times the LLC transmits an RR without receiving an acknowledgment when the inactivity timer expires. Default is 8. Minimum is 1. Maximum is 127.

n3-frames-rcvd-before-ack
This value is used with the T2 timer to reduce acknowledgment traffic for received I-frames. Set this counter to a specified value. Each time an I-frame is received, this value is decremented. When this counter reaches 0 or the T2 timer expires, an acknowledgment is sent. Default is 1. Minimum is 1. Maximum is 255.

nw-acks-to-inc-ww
This field is set to a default value of 1.

rw-receive-window
Sets the number of I-frames that can be received before an RR is transmitted. Default is 2. Minimum is 1. Maximum is 127.

t1-reply-timer
This timer expires when the LLC fails to receive a required acknowledgment or response from the other LLC station. When this timer expires, an RR is sent with the poll bit set and T1 is started again. If the LLC receives no response after the configured maximum number of retries (N2), the link underneath is declared inoperative. Default is 1. Minimum is 1. Maximum is 256.

t2-receive-ack-timer
This timer is used to delay sending of an acknowledgment for a received I-format frame. This timer is started when an I-frame is received and reset when an acknowledgment is sent. If this timer expires, LLC2 sends an acknowledgment as soon as possible. Set this value so that it is less than that of T1. This insures that the remote LLC2 peer receives the delayed acknowledgment before the T1 timer expires. Default is 1 (100 ms). Minimum is 1. Maximum is 2560.
Note:If this timer is set to 1 (the default) it will not run (for example, n3-frames-rcvd-before-ack=1).

ti-inactivity-timer
This timer expires when the LLC does not receive a frame for a specified time period. When this timer expires the LLC transmits an RR until the other LLC responds or the N2 timer expires. Default is 30 seconds. Minimum is 1 second. Maximum is 256 seconds.

tw-transmit-window
Sets the maximum number of I-frames that can be sent before receiving an RR. Assuming that the other end of the LLC session can actually receive this many consecutive I-frames, and the device has enough heap memory to keep copies of these frames until an acknowledgment is received, increasing this value may increase the throughput. Default is 2. Minimum is 1. Maximum is 127.

Accessing the LEC Monitoring Environment

Use the following procedure to access the LEC monitoring commands. This process gives you access to the LEC monitoring process.

  1. At the OPCON prompt, enter talk 5. (For more detail on this command, refer to "What is the OPCON Process?".) For example:
    * talk 5
    +
    

    After you enter the talk 5 command, the GWCON prompt (+) displays on the console. If the prompt does not appear when you first enter configuration, press Return again.

  2. At the + prompt, enter the network ? command to display the network interface numbers for which the device is currently configured, and enter the interface number for the LEC you wish to monitor. For example:
      + network ?
     
      1  : ATM Ethernet LAN Emulation: ETH
      2  : IP Protocol Network
      3  : Bridge Application
      5  : CHARM ATM Adapter
      Network number [0]? 1
      LEC+
    

    The LEC monitoring prompt (LEC+), is displayed.

    If you know the interface number of the LEC you wish to monitor, enter the network command followed by the interface number of the LEC.

      + network 1
      LEC+
    

LEC Monitoring Commands

This section summarizes and then explains the LEC monitoring commands. You can access LEC monitoring commands at the LEC+ prompt. Table 50 shows the commands.

Table 50. LE Client Monitoring Command Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 List   Lists: 
  • LEC Address Resolution Table (ARP)
  • LEC configuration
  • Data Direct VCC information
  • Group addresses
  • RIF information
  • LEC statistics
  • VCC table.
 LLC   Gets you to the LLC> monitoring prompt for Token Ring LECs. 
 MIB   Displays LEC MIB objects including: 
  • LEC MIB Configuration Table
  • LEC MAC ARP Table
  • LEC Route Descriptor Table
  • LEC MIB Server VCC Tables
  • LEC MIB Statistics Table
  • LEC MIB Status Table
 QoS   Gets you to the LEC x QoS+ prompt from which you can monitor Quality of Service as described in Quality of Service Monitoring Commands in Using and Configuring Features
 Trace  Sets packet tracing on or off or sets a trace address or trace mask.
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

List

Use the list command to list the LEC Address Resolution Table (ART), list the LEC configuration, list Data Direct VCC information, or list LEC statistics.

Syntax:

list
arp-table

configuration

data-direct-vccs

group

rif

statistics

vcc-table

arp
Lists the LEC Address Resolution Table (entries in the ARP cache).

Example:

LEC+ list arp
 
         LEC Address Resolution (LE ARP Cache) Table
 
  Max Table Size          = 10
  Free Table Entries      = 10
  Current Mac Entries     = 0
  Current RD Entries      = 0
  Arp Aging Time          = 300
  Verify Sweep Interval   = 60
 
                                Xmit  BUS   Arp
                        Conn   Queue Frame Retry Aging
 MAC Address     Remote Handle Depth Count Count Timer  Destination ATM Ad
                                                                    dress
 ------------------------------------------------------------------------
 40.00.00.00.00.09 False 652   0     0     0     60     39.99.99.99.99.99.
                               99.00.00.99.99.30.02.40.00.00.00.00.09.81
Note:The Sweep Interval is always one-fifth of the ARP Aging Timer value.

Max Table Size
The total number of entries available

Free Table Entries
The number of free entries

Current MAC Entries
 

Current RD Entries
Route Descriptor ATM entries

ARP Aging Time
Time for an entry to be aged out

Verify Sweep Interval
 

MAC Address
 

Remote
 

Connection Handle
 

Queue Depth
 

Xmit Frame Count
 

BUS Retry Count
 

ARP Aging Timer
 

Destination ATM Address
 

configuration
Lists the LEC configuration.

For Ethernet:

Example:

IBM LEC+ list config
                 ATM IBM LEC Configuration
   Physical ATM interface number             = 0
   LEC interface number             = 7
   Primary ATM address
          ESI address               = Use burned in addr
          Selector byte             = 0x3
   Emulated LAN type                = Ethernet IBM
   Maximum frame size               = 1523
   LE Client MAC address            = Use burned in addr
   LE Server ATM address            = 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
   Forward Peak Rate                = 155000
   Backward Peak Rate               = 155000
    MAC cache size                   = 32
   MAC cache aging period           = 60
   Route Descriptor cache size      = 32
   Route Descriptor aging period    = 60
   LES Registration interval        = 60
   LES Registration retry count     = 3
   LES keep alive count             = 10
   Packet trace                     = No
   IP Encapsulation                 = ETHER

For Token Ring IBM:

Example:

IBM LEC+list config
 
                      ATM IBM LEC Configuration
   Physical ATM interface number             = 0
   LEC interface number             = 10
   Primary ATM address
          ESI address               = Use burned in addr
          Selector byte             = 0x6
   Emulated LAN type                = Token Ring IBM
   Maximum frame size               = 4551
   LE Client MAC address            = Use burned in addr
   LE Server ATM address            = 39.84.07.00.00.00.00.00.00.00.00.00.00.01.10.00.5A.DD.DA.02
   Forward Peak Rate                = 155000
   Backward Peak Rate               = 155000
    MAC cache size                   = 32
   MAC cache aging period           = 60
   Route Descriptor cache size      = 32
   Route Descriptor aging period    = 60
   LES Registration interval        = 60
   LES Registration retry count     = 3
   LES keep alive count             = 10
   Packet trace                     = No
   RIF Aging Timer                  = 120
   Source Routing                   = Enabled
 

For Token Ring Forum Compliant:

Example:

LEC+ list config
 
   Physical ATM interface number = 0
   LEC interface number          = 9
   LEC ATM address               = 39.99.99.99.99.99.99.00.00.99.99.31.01.09.FC.DD.D0.32.70.0A
   LEC MAC address               = 40.00.82.10.17.09
   lecConfigMode                 = Manual
   lecConfigLanType              = 802.5 - Token Ring
   lecConfigMaxDataFrameSize     = 4544
   lecConfigLanName              =
   lecConfigLesAtmAddress        = 39.99.99.99.99.99.99.00.00.99.99.31.01.40.00.82.10.17.00.09
   lecControlTimeout             = 30
   lecMaxUnknownFrameCount       = 10
   lecMaxUnknownFrameTime        = 1
   lecVccTimeoutPeriod           = 1200
   lecMaxRetryCount              = 1
   lecAgingTime                  = 300
   lecForwardDelayTime           = 15
   lecExpectedArpResponseTime    = 1
   lecFlushTimeout               = 4
   lecPathSwitchingDelay         = 6
   lecLocalSegmentId             = 0x0
   lecMulticastSendType          = 1
   lecMulticastSendAvgRate       = 365566
   lecMulticastSendPeakRate      = 365566
   lecConnectionCompleteTimer    = 4
   lecInitialControlTimeout      = 5
   lecControlTimeoutMultiplier   = 2
   V2 Capable                    = TRUE
   lecForwardDisconnectTimeout   = 60
   lecMinReconfigDelay           = 1
   lecMaxReconfigDelay           = 5
   lecMaxBusConnectRetries       = 0
   lecElanId                     = 0
   ExplorerExclude               = TRUE
   Data direct VCC mode          = TRUE
   Data direct timeout           = 20
   LE ARP queue depth            = 5
   LE ARP cache size             = 5000
   Forward peakrate              = 365566
   Backward peakrate             = 365566
   Packet trace                  = Off
   RIF aging timer               = 120
   Source Routing                = enabled
 

See "Set" for a definition of the parameters shown in the above examples.

data
Lists the LEC Data Direct VCC information.

Example:

LEC+ list data
 
          LEC Data Direct VCC Table
 
   Max Table Size     = 1019    Max no of SVC connections
   Current Size       = 0       Currently used
   Inactivity Timeout = 1200    No Data Xfer Timeout before connection is
                                closed (seconds)
   Sweep Interval     = 60
      Conn              Inactive  User
      Handle  VPI  VCI   Timer    Count  Destination ATM Address
    ----------------------------------------------------------------------------
 
       652     0  7241    300       1    39.99.99.99.99.99.99.00.00.99.99.30.02.
                                         40.00.00.00.00.09.81
 
 
    ----------------------------------------------------------------------------

group
Lists the group addresses in use by the LEC.

rif
Lists the MAC address to Routing Information Field (RIF) mappings in use by the LEC.

statistics
Lists LEC statistics.

Example:

LEC+ list stat
 
          LEC Statistics
 
   In Octets.high     = 0       No of Bytes received
   In Octets.low      = 346
   In Discards        = 2       Packets discarded
   In Errors          = 0       Rx.Errors
   In Unknown Protos  = 0       Unknown protocols received
   Out Octets.high    = 0       No of Bytes xmitted.
   Out Octets.low     = 0
   Out Discards       = 0
   Out Errors         = 0       Tx.Errors
   In Frames          = 0
   Out Frames         = 0
   In Bytes           = 0
   Out Bytes          = 0

VCC table
Lists VCC table.

Example:

LEC+ list vcc
 
 

LLC

Logical Link Control can be thought of as a "sub-protocol". It is not accessed directly from either the Talk 6 (configuration) or the Talk 5 (console) environment. Instead, it is accessed from the Token Ring LEC monitoring menu by entering an LLC command.

Use the llc command to access the LLC> prompt. See"LLC Monitoring Commands" for more information.

Syntax:

llc

MIB

Use the mib command to display MIB objects.
Note:Some of this information may be displayed in a different format using the list command.

Syntax:

mib
config-table

mac-arp-table

rd-arp-table

server-vcc-table

statistics-table

status-table

config
Displays the LEC MIB Configuration Table.

Example:

LEC+ mib config
 
 lecConfigTable:
 lecConfigMode                 = Manual
 lecConfigLanType              = 802.3 - Ethernet
 lecConfigMaxDataFrameSize     = 1516
 lecConfigLanName              =
 lecConfigLesAtmAddress        = 39.84.0F.00.00.00.00.00.11.23.24.24.24.24.55.66.77.88.99.00
 lecControlTimeout             = 120
 lecMaxUnknownFrameCount       = 1
 lecMaxUnknownFrameTime        = 0
 lecVccTimeoutPeriod           = 1200
 lecMaxRetryCount              = 1
 lecAgingTime                  = 300
 lecForwardDelayTime           = 15
 lecExpectedArpResponseTime    = 1
 lecFlushTimeout               = 4
 lecPathSwitchingDelay         = 6
 lecLocalSegmentId             = 0
 lecMulticastSendType          = 1
 lecMulticastSendAvgRate       = 25000000
 lecMulticastSendPeakRate      = 25000000
 
 
 lecConnectionCompleteTimer    = 4
 lecInitialControlTimeout       = 5
 lecControlTimeoutMultiplier= 2
 lecConfigV2Capable            = TRUE
 lecForwardDisconnectTimeout   = 60
 lecMinReconfigDelay          = 1
 lecMaxReconfigDelay         = 5
 lecMaxBusConnectRetries  = 1
 ExplorerExclude                   = FALSE
 Data direct VCC mode         = TRUE
 Data direct timeout               = 20
 

lecConfigMode
LEC config mode: AUTO or MANUAL. If AUTO, LEC Uses LECS to get the LES ATM address.

lecConfigLanType
LAN type, either Ethernet or token-ring

lecConfigMaxDataFrameSize
Maximum frame size

lecConfigLanName
ELAN Name

lecConfigLesAtmAddress
LE Server ATM address

lecControlTimeout
Timeout for request/response control frame

lecMaxUnknownFrameCount
Maximum number of unknown frames

lecMaxUnknownFrameTime
Period in which LEC will send a maximum of MaxUnknownFrameCount frames to the BUS for a given unicast LAN Destination, and it must also initiate the address resolution protocol to resolve that LAN Destination.

lecVccTimeoutPeriod
Inactivity timeout of SVC Data Direct VCCs

lecMaxRetryCount
LE ARP retry count

lecAgingTime
Life of unverified entry in the ARP table

lecForwardDelayTime

lecExpectedArpResponseTime
ARP Request/Response cycle time

lecFlushTimeout
LE Flush Request/Flush Reply timeout period

lecPathSwitchingDelay
 

lecLocalSegmentId
Segment ID of emulated LAN. Only for 802.5 clients

lecMulticastSendType
Signaling parameter used by LEC for multicast send VCC

lecMulticastSendAvgRate
Signaling parameter used by LEC for multicast send VCC

lecMulticastSendPeakRate
Signaling parameter used by LEC for multicast send VCC

lecConnectionCompleteTimer
Time to wait before sending a READY_QUERY

lecInitialControlTimeout
Specifies the maximum cumulative control timeout

lecControlTimeoutMultiplier
Specifies the control timeout multiplier

lecConfigV2Capable
Specifies whether the LEC is LANE version 2 capable

lecForwardDisconnectTimeout
Specifies the time period to wait after losing last Multicast Forward VCC

lecMinReconfigDelay
Specifies the minimum delay time the LEC waits in initial state

lecMaxReconfigDelay
Specifies the maximum delay time the LEC waits in initial state

lecMaxBusConnectRetries
Specifies the maximum BUS connect retries before returning to initial state

ExplorerExclude
Specifies whether to drop RIF explorer frames

Data Direct VCC Mode
Specifies the persistent Data Direct mode

Data Direct Timeout
Specifies the persistent Data Direct VCC Timeout

mac
Displays the LEC MAC ARP Table

rd
Displays the LEC Route Descriptor Table

server
Displays the LEC MIB Server VCC Tables

Example:

LEC+ mib server
 
lecServerVccTable:
   lecConfigDirectInterface      = 0
   lecConfigDirectVpi            = 0
   lecConfigDirectVci            = 0
   lecControlDirectInterface     = 1
   lecControlDirectVpi           = 0
   lecControlDirectVci           = 38
   lecControlDistributeInterface = 1
   lecControlDistributeVpi       = 0
   lecControlDistributeVci       = 37
   lecMulticastSendInterface     = 1
   lecMulticastSendVpi           = 0
   lecMulticastSendVci           = 34
   lecMulticastForwardInterface  = 1
   lecMulticastForwardVpi        = 0
   lecMulticastForwardVci        = 33

lecConfigDirectInterface
The interface associated with the Configuration Direct VCC

lecConfigDirectVpi
VPI which identifies the above VCC if it exists

lecConfigDirectVci
VCI which identifies the above VCC if it exists

lecControlDirectInterface
The interface associated with the Control Direct VCC

lecControlDirectVpi
VPI which identifies the above VCC if it exists

lecControlDirectVci
VCI which identifies the above VCC if it exists

lecControlDistributeInterface
The interface associated with the Control Distribute VCC

lecControlDistributeVpi
VPI which identifies the above VCC if it exists

lecControlDistributeVci
VCI which identifies the above VCC if it exists

lecMulticastSendInterface
The interface associated with the Multicast Send VCC

lecMulticastSendVpi
VPI which identifies the above VCC if it exists

lecMulticastSendVci
VCI which identifies the above VCC if it exists

lecMulticastForwardInterface
The interface associated with the Multicast Forward VCC

lecMulticastForwardVpi
VPI which identifies the above VCC if it exists

lecMulticastForwardVci
VCI which identifies the above VCC if it exists

statistics
Displays the LEC MIB Statistics Table.

Example:

LEC+ mib statistics
 
lecStatisticsTable:
   lecArpRequestsOut             = 1
   lecArpRequestsIn              = 0
   lecArpRepliesOut              = 0
   lecArpRepliesIn               = 1
   lecControlFramesOut           = 2
   lecControlFramesIn            = 2
   lecSvcFailures                = 1

lecArpRequestsOut
No. of LE ARP requests sent by this LEC

lecArpRequestsIn
No. of LE ARP requests received by this LEC

lecArpRepliesOut
No. of LE ARP responses sent by this LEC

lecArpRepliesIn
No. of LE ARP responses received by this LEC

lecControlFramesOut
No. of Control Packets sent by this LEC

lecControlFramesIn
No. of Control Packets received by this LEC

lecSvcFailures
The total number of:

  • Outgoing LAN Emulation SVCs which this client tried but failed, to open

  • Incoming LAN Emulation SVCs which this client tried, but failed to establish

  • Incoming LAN Emulation SVCs which this client rejected for protocol or security reasons

status
Lists MIB status.

Example:

LEC+ mib status
 
lecStatusTable:
   lecPrimaryAtmAddress          = 39.84.0F.00.00.00
   Client ATM address=           = 00.00.00.00.00.01.10.00.5A.00.DE.AD.03
   lecId                         = 1                    Assigned by LES
   lecInterfaceState             = Operational          State of the LEC
   lecLastFailureRespCode        = None                 Error code from last
                                                        failed Config/Join resp.
   lecLastFailureState           = Initial State        State of LEC when
                                                        updating above field.
   lecProtocol                   = 1                    Protocol specified by
                                                        LEC in Join requests.
   LecVersion                    = 1                    LEC Protocol Version
                                                        of above
   lecTopologyChange             = False
   lecConfigServerAtmAddress     = 00.00.00.00.00.00.
   
   lecConfigSource               = Did not use LECS
   lecActualLanType              = 802.3 - Ethernet     Frame format currently
                                                        used by LEC
   lecActualMaxDataFrameSize     = 1516
   lecActualLanName              = ETH                  Name of emulated LAN
                                                        that LEC joined.
   lecActualLesAtmAddress        = 39.84.0F.00.00.00.
   
   lecProxyClient                = False                Is LES acting like a
                                                        proxy ?

QoS Information

Use the qos-information command to get to the LEC x QoS+ prompt from which you can monitor Quality of Service as described in Quality of Service Monitoring Commands in Using and Configuring Features.

Syntax:

qos-information
 

Trace

Use the trace command to turn packet tracing on or off on the LEC. See "Packet-trace Monitoring Commands" for more information.

Use the trace mac-address command to limit the data traced. A packet will only be traced if its destination or source MAC address logically ANDed with the trace MAC mask equals the trace MAC address logically ANDed with the trace MAC mask.

Syntax:

trace
 

LLC Monitoring Commands

This section summarizes and then explains all of the LLC commands. These commands, shown in Table 51, let you monitor the LLC while passing packets over an SNA network.

Table 51. LLC Monitoring Command Summary
 Command   Function 
? (Help) Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
 List   Displays configuration information. 
 Set   Allows the user to dynamically configure LLC parameters that are valid for the life of the session. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

List

Use the list command to display configuration information.

Syntax:

list

Set

Use the set command to dynamically configure the LLC parameters on a current LLC session. Any changes that you make to the parameters are effective for the life of session.

Attention:   Changing LLC parameters from the default can affect how the LLC protocol works.

Syntax:

set
n2-max_retry count

n3-frames-rcvd-before-ack count

nw-acks-to-inc-ww count

t1-reply-timer seconds

t2-receive-ack-timer seconds

ti-inactivity-timer seconds

tw-transmit-window seconds

n2-max_retry
The maximum number of retries by LLC protocol. For example, N2 is the maximum number of times the LLC transmits an RR without receiving an acknowledgment when the inactivity timer expires. Default is 8. Minimum is 1. Maximum is 127.

n3-frames-rcvd-before-ack
This value is used with the T2 timer to reduce acknowledgment traffic for received I-frames. Set this counter to a specified value. Each time an I-frame is received, this value is decremented. When this counter reaches 0 or the T2 timer expires, an acknowledgment is sent. Default is 1. Minimum is 1. Maximum is 255.

nw-acks-to-inc-ww
This field is set to a default value of 1.

t1-reply-timer
This timer expires when the LLC fails to receive a required acknowledgment or response from the other LLC station. When this timer expires, an RR is sent with the poll bit set and T1 is started again. If the LLC receives no response after the configured maximum number of retries (N2), the link underneath is declared inoperative. Default is 1. Minimum is 1. Maximum is 256.

t2-receive-ack-timer
This timer is used to delay sending of an acknowledgment for a received I-format frame. This timer is started when an I-frame is received and reset when an acknowledgment is sent. If this timer expires, LLC2 sends an acknowledgment as soon as possible. Set this value so that it is less than that of T1. This insures that the remote LLC2 peer receives the delayed acknowledgment before the T1 timer expires. Default is 1 (100 ms). Minimum is 1. Maximum is 2560.
Note:If this timer is set to 1 (the default) it will not run (for example, n3-frames-rcvd-before-ack=1).

ti-inactivity-timer
This timer expires when the LLC does not receive a frame for a specified time period. When this timer expires the LLC transmits an RR until the other LLC responds or the N2 timer expires. Default is 30 seconds. Minimum is 1 second. Maximum is 256 seconds.

tw-transmit-window
Sets the maximum number of I-frames that can be sent before receiving an RR. Assuming that the other end of the LLC session can actually receive this many consecutive I-frames, and the device has enough heap memory to keep copies of these frames until an acknowledgment is received, increasing this value may increase the throughput. Default is 2. Minimum is 1. Maximum is 127.


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