Software User's Guide Version 3.4
This chapter describes the SDLC configuration and operational
commands. It contains the following sections:
Changes made at the configuration command console (SDLC
CONFIG>) become part of the SRAM configuration when you restart the
router.
Conversely, SDLC monitoring commands entered within the SDLC monitoring
process take effect immediately. However, changes made with monitoring
commands do not become part of the router's static configuration.
When the router is restarted, the effects of the monitoring commands are
overwritten by the router's static configuration. Monitoring
consists of the following actions:
- Monitoring the protocols and network interfaces that are currently in use
by the router
- Making real-time changes to the SDLC configuration without permanently
affecting the SRAM configuration
- Displaying ELS (Event Logging System) messages relating to router
activities and performance
Use the CONFIG process to change the configuration of the router.
The new configuration takes effect when the router is restarted.
To enter the configuration process:
- Enter talk 6 (or t 6), at the OPCON (*)
prompt. This brings you to the CONFIG> prompt as shown in
the following example:
MOS Operator Console
For help using the Command Line Interface, press ESCAPE, then '?'
* talk 6
CONFIG>
If the CONFIG> prompt does not appear immediately, press the
Enter key again.
All SDLC configuration commands are entered at the SDLC
config> prompt. You can use the GWCON t 5 (See "The Operating/Monitoring Process (GWCON - Talk 5) and Commands") environment to make dynamic configuration
changes. However, these changes will disappear when the device is
restarted.
- At the Config> prompt, enter the set data-link
sdlc command. When prompted, enter the name of the interface to
associate with the SDLC device.
Config>set data-link sdlc
Interface number [0]? 2
Config>
- Next, enter the network command, plus the number of an SDLC
interface that you entered earlier.
Config>network 2
SDLC 2 Config>
Refer to "Getting Started" for information related to the configuration
environment.
The SDLC configuration commands allow you to create or modify the SDLC
interface configuration. This section summarizes and describes the
commands you can issue from the SDLC Config> prompt within the
network configuration console. Defaults for any command and its
parameters are displayed on the console, they are enclosed in brackets
immediately following the prompt.
| Note: | In addition to configuring SDLC using the commands described in this chapter,
you also need to configure SDLC in the DLSw or APPN protocol.
|
2212 supports SDLC connections over RS-232, X.21, and V.35
serial interfaces.
Table 56 lists SDLC configuration commands and their function.
Table 56. SDLC 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 SDLC end station. If stations are not added
specifically, they will be dynamically created with default values when DLSw
or APPN activates devices.
|
| Delete
| Removes an SDLC end station.
|
| Disable
| Prevents connections to one of the SDLC link stations.
|
| Enable
| Allows connections to one of the SDLC link stations.
|
| List
| Displays configured information for one of the SDLC link stations or
lines.
|
| Set
| Configures specific interface and link-station
information.
|
| Exit
| Returns you to the previous command level. See "Exiting a Lower Level Environment".
|
Use the add command to add an end station. The router is,
by default the primary end station. If you do not use this command and
if you configured an SDLC station in DLSw or in APPN, the end station is added
for you. The software assigns the following defaults to the
station:
- Maximum BTU is maximum allowable by the interface
- Tx and Rx Windows are 7 for MOD 8, 127 for MOD 128
If the defaults are satisfactory, you do not need to add SDLC
stations.
Syntax:
- add
- station
Example:
add station
Enter station address (in hex) [C4]?
Enter station name [SDLC_C4]?
Include station in router as secondary group poll list (Yes or [No]):
Enter router as primary group poll address (0 means disable) [00]?
Enter max packet size [2048]?
Enter "A" for 2-WAY-ALTERNATING or "S" for 2-WAY-SIMULTANEOUS [S]?
Enter router as secondary link station poll pause [0]?
Enter receive window [7]?
Enter transmit window [7]?
- Enter station address
- The station's SDLC address in the range 01 - FE.
- Enter station name
- The name designation of the SDLC station (maximum characters is 8).
- Include station in router as secondary group poll list
- Select whether or not to include this station in the secondary group poll
list for this interface. The SDLC software supports the IBM 3174 group
poll function for SDLC secondary station. You must add a group poll
address using the set link group-poll command for this parameter to
have an affect.
- Enter router as primary group poll address (0 means disable)
- Specifies the group address that is to be polled. The Primary Group
Poll Address is entered per station.
Valid Values: X'00' to X'FE', where 0
indicates not using group poll
Default Value: X'00'
- Enter max packet size
- The maximum packet size that can be sent to or received from the remote
link station. This value cannot be greater than that specified for the
link. This value is configured with the set link frame-size
command.
- Enter "A" for 2-WAY-ALTERNATING or "S" for 2-WAY-SIMULTANEOUS
- Specifies whether the link station operates in a 2-way-simultaneous or
2-way-alternating mode. The default is inherited from the interface
configuration.
- Enter router as secondary link station poll pause
- Specifies the amount of time a secondary station will delay sending poll
final after being polled.
Notes:
- This value should be less than the poll timeout for the primary
station.
- Values other than 0 on multipoint links can cause poor response
time.
Valid Values: 0 to 25.5 seconds in increments of
0.1 seconds
Default Value: 0
- Enter receive window
- The maximum number of packets that the router can receive without sending
an acknowledgement.
| Note: | Ensure that the receive window size is sufficiently large, because the router
will disconnect the station if the window size is exceeded. Set the
receive window to the maximum value for the configured
modulo. Unless there is some reason to closely monitor the receive
window size, it should be set to the maximum value for the modulo being
used.
|
- Enter transmit window
- The maximum number of packets that the router can transmit without
receiving an acknowledgement.
Use the delete command to remove the specified end station
(station name or address) from the SDLC configuration. The router is
considered the primary end station (default).
Syntax:
- delete
- station name or address
Use the disable command to prevent connections from being
created with a SDLC link station.
Syntax:
- disable
- link
-
- station . . .
- link
- Prevents the transmitting and receiving of data to all configured SDLC
link stations on the interface.
- station name or address
- Prevents the transmitting and receiving of data to the specified end
station (station name or address).
Use the enable command to enable connections to remote SDLC link
stations.
Syntax:
- enable
- link
-
- station
- link
- Allows subsystems in the router (for example, DLSw) to use SDLC's
facilities.
- station name or address
- Allows connections to the specified secondary remote end station (link
station name).
Use the list command to display configuration information on one
or all SDLC link stations.
Syntax:
- list
- link
-
- station name or all
- link
- Displays the SDLC interface's configuration.
Example:
list link
Link configuration for: LNK00001 (ENABLED)
Role: PRIMARY Type: POINT-TO-POINT
Modulo: 8 Frame Size: 2048
Sc Gp Poll: 00 Dflt protcl: ALTERNATE
Timers: XID/TEST response: 2.0 sec
SNRM response: 2.0 sec
Poll response: 2.0 sec
Inter-poll delay: 0.0
Primary poll pause: 0.5 sec
Dflt sec poll pause: DISABLED
RTS hold delay: DISABLED
Inactivity timeout: 30.0 sec
Counters: XID/TEST retry: 8
SNRM retry: 6
Poll retry: 10
SDLC 1 Config>
- Link configuration
- The name and status of SDLC link station that are in the router's
configuration.
- Role
- The primary, secondary, or negotiable role for link stations that you
configure using the set link role command.
- Type
- The type of link, multipoint or point-to-point. IF role
is secondary, a value of multipoint for this parameter
causes RTS to be lowered when not transmitting.
- Duplex
- Specifies the hardware capability of the line. For two-way
simultaneous link management, full duplex hardware capability is
required.
- Modulo
- The sequence number range to use on the link: MOD 8 (0-7) or MOD 128
(0 - 127).
- Idle state
- The bit pattern (FLAG or MARK) transmitted on the line when the interface
is not transmitting data.
- Speed
- The physical data rate of the interface. When the clocking is
internal, this is the data rate generated by the internal clock. This
parameter has no effect for externally clocked lines.
- Group Poll
- Address used for the group poll feature. Secondary stations having
group inclusion coded as yes will respond to unnumbered polls
received from this address. This address must be non-zero for the group
poll feature to be in effect for any secondary stations under this
link. Each secondary station will still have a specific station address
in addition to the group address.
- Cable
- Specifies the type of cable in use (RS-232, V.35, V.36, or
X.21).
- Encoding
- Configures the SDLC transmission encoding scheme as NRZ (Non-Return to
Zero) or NRZI (Non-Return to Zero Inverted).
- Clocking
- Interface clocking, external or internal.
- Frame Size
- The maximum frame size that can be sent over the interface.
- Timers:
- All the timers listed below have a 100ms resolution.
- XID/TEST resp.
- The time to wait for an XID or TEST response message before retransmitting
the XID or TEST frame. A value of 0 indicates that the router will not
delay the retry past its next poll list turn.
- SNRM response
- The maximum time to wait for a UA response message before the station
retransmits SNRM(E).
- Poll response
- The maximum time to wait for a response from any polled station before
retrying.
- Inter-poll delay
- The amount of time the router (with a primary role) waits after receiving
a response, before polling the next station.
| Note: | Primary Poll Pause is the preferred poll timer. Inter-Poll Delay
causes end user response time problems. See page *** for more information about primary poll pause.
|
- RTS hold delay
- The amount of time that the primary router waits before dropping RTS low
after the transmission of a frame. The RTS hold delay parameter is
specific to half-duplex and secondary multipoint operation.
- Interframe delay
- Specifies an amount of time to inject flags between frames. The
maximum value of 120 injects about 15 flags between frames for a 9600 baud
line.
- Leading Flags
- The number of flags sent if the interframe delay is not sufficient for a
response to the device on the other end of this link. This is a time
unit with a maximum value of 100.
- Inactivity timeout
- For idle NRM/E secondary stations, sets the time after which the interface
changes the station to its recovery state. A 0 (zero) causes the
station to remain idle indefinitely.
- Counters:
-
- XID/TEST retry
- The maximum number of times the router sends an XID or TEST frame without
receiving a response before timing out. A value of 0 indicates that the
router will retry indefinitely.
- SNRM
- The maximum number of times the router will send an SNRM(E) frame without
receiving a response before timing out. A value of 0 indicates that the
router will retry indefinitely.
- Poll retry
- The maximum number of times the router polls the station without receiving
a response before timing out. A value of 0 indicates that the router
will continue to retry indefinitely.
| Note: | Physical layer parameters such as duplex type, speed,
cable type, encoding, clocking, leading
flags, and inter-frame delay do not apply for SDLC dial
circuit interfaces and are not displayed by the list link
command.
|
- station all or address or link station
name
- Displays information for the specified SDLC link station or for all link
stations.
Example:
list station c1
Addr-A/S Rx Tx Secondary Primary
(Sec Gp) Name Status Max BTU Window Window Poll Pause GP Addr
-------- -------- ---------- ------- ------ ------ ----------- -------
C1 A SDLC_C1 ENABLED 2048 7 7 0.0 sec 00
Example:
list station all
Addr-A/S Rx Tx Secondary Primary
(Sec Gp) Name Status Max BTU Window Window Poll Pause GP Addr
-------- -------- ---------- ------- ------ ------ ----------- -------
C1 A SDLC_C1 ENABLED 2048 7 7 0.0 sec 00
C2 A SDLC_C2 ENABLED 2048 1 7 0.0 sec 00
- Address
- The address of the SDLC link station. The address in parentheses is
the "router as secondary" Group Address of the interface which is used by the
station if the station has group inclusion set, link is secondary, and the
secondary group address is non-zero.
- Name
- The character string name designation of SDLC link station.
- Status
- The status of the SDLC link station, ENABLED or DISABLED.
- Max BTU
- The frame size limit of the station. This frame size must not be
larger than the maximum Basic Transmission Unit (BTU) packet size configured
with the set link frame-size command.
- Rx Window
- The size of the receive window.
- Tx Window
- The size of the transmit window.
Use the set command to configure specific information for one or
all SDLC link stations.
Syntax:
- set
- link
-
- cable*
-
- clocking*
-
- duplex* . . .
-
- encoding* . . .
-
- frame-size
-
- group poll* ...
-
- idle* . . .
-
- inactivity ...
-
- inter-frame delay*
-
- modulo . . .
-
- name
-
- poll . . .
-
- role* . . .
-
- snrm
-
- speed*
-
- type* . . .
-
- xid/test
-
- station
-
- address. . .
-
- group-inclusion
-
- gp-address-prim
-
- max-packet
-
- name
-
- protocol
-
- receive-window
-
- secondary-phase
-
- transmit-window
| *Note: | These commands are not available for SDLC dial circuit interfaces.
|
- link cable type
- Sets the cable connected to this interface. The options are
V.36 and the following DCE and DTE types: RS-232, V.35,
and X.21.
A DTE cable is used when you are attaching the router to some type of DCE
device (for example, a modem or a DSU/CSU).
A DCE cable is used when the router is acting as the DCE and providing the
clocking for direct attachment.
- link clocking internal or external
- To connect to a modem or DSU, configure external clocking and select the
appropriate DTE cable with the set link cable command.
To connect directly to another DTE device, configure internal clocking,
select the appropriate DCE cable with the set link cable command,
and configure the clocking/line speed with the set link speed
command.
Default: external
- link duplex full or half
- Configures the SDLC line for full-duplex or
half-duplex signaling. Half-duplex means that the
2212 raises RTS and expects to see CTS before it will transmit data.
Full-duplex means that the 2212 does not wait for CTS to be raised
before is transmits data.
| Note: | The duplex type does not control how SDLC operates at the SDLC protocol level
(two-way simultaneous or two-way alternating).
|
- link encoding nrz or nrzi
- Configures the SDLC transmission encoding scheme as NRZ (Non-Return to
Zero) or NRZI (Non-Return to Zero Inverted). NRZ is the default.
- link frame-size
- Configures the maximum size of the frames that can be transmitted and
received on the data link. Valid entries are shown in Table 57.
Table 57. Valid Values for Frame Size in Link Frame-Size Command
| Minimum
| Maximum
| Default
|
| 262
| 8187
| 2048
|
Set the link frame size greater than or equal to the maximum packet size
that you configured with the set station xxx max packet
command. Otherwise, the router automatically resets the maximum packet
size to the link frame size and issues the following ELS message:
SDLC.054: nt 3 SDLC/0 Stn xx-MaxBTU too large for Link adjusted (4096->2048)
Example: set link frame-size
Frame size in bytes (262 - 8187)[2048]?
- link group-poll
- Sets a group poll address for router as secondary stations on the
link. The SDLC software supports the IBM 3174 group poll
function. Use the add station or the set station
group inclusion command to include a station in the group poll
list.
Example:
set link group-poll
Enter group poll address router as secondary (in hex) [00:]?f3
Group poll support enabled
- link idle flag
- Configures the transmit idle state for SDLC framing. The default is
the flag option which provides continuous flags (7E) between frames.
Example: set link idle flag
The link will receive a flag idle transparently.
- link idle mark
- Configures the transmit idle state for SDLC framing. The mark
option puts the line in a marking state (OFF, 1) between frames.
- link inactivity #-of-seconds
- For idle NRM/E secondary stations, sets the time after which the interface
changes the station to its recovery state. The range is 0 to 7200
seconds. The default is 30. A 0 (zero) causes the station to
remain idle indefinitely.
Example:
set link inactivity
Enter secondary link station inactivity timeout :[30.0]?
- link inter-frame delay
- Allows the insertion of a delay between transmitted packets. This
command ensures a minimum delay between frames for compatibility with older,
slower serial devices at the other end. This parameter is the amount of
time between frames.
Valid values: 0 to 120
Default value: 0
Example:
set link inter-frame
Transmit Delay Counter [0]?
- link modulo 8 or 128
- Specifies the sequence number range to use on the link: MOD 8 (0-7)
or MOD 128 (0 - 127). Default is MOD 8.
| Note: | When you change this value, the window sizes become invalid. Use the
set station command to change the receive window and transmit
window sizes. Valid window sizes are 0 through 7.
|
Also, when link modulo is 128, a SNRME rather than a
SNRM is used at connection start-up and supervisory frame headers are expanded
by an additional byte.
- link name
- Establishes a character string for the link that you are
configuring. This parameter is for informational purposes only.
Example:
set link name
Enter link name: [LINK_0]?
- link poll delay
- Sets the time delay between each poll that is sent over the
interface. link poll delay is less preferred than link
poll ppause. link poll delay puts a delay between
every poll, and thus causes response time problems even when the link is
lightly utilized. If link poll ppause is set > 0, then
link poll delay must be set to 0.
Example:
set link poll delay
Enter delay between polls [0]?
You can also use the t 5 command set link poll
ppause to set primary poll pause.
- link poll ppause
- Sets the primary poll pause.
This parameter determines the minimum time to restart the polling
cycle. For example, if there are 5 stations on a multi-dropped link and
all 5 station are polled in 0.2 seconds and PPAUSE is set to 0.5
seconds, then the poll of the first station will wait 0.3 more
seconds. If data had been received from some stations, then the time to
complete the polling of all 5 station probably would have taken longer than
0.5 seconds and the poll of the first station would not have been
delayed.
Example:
set link poll ppause
Enter delay between polls [0.5]?
- link poll retry
- Sets the number of times the interface retries to poll the secondary SDLC
link station before it closes the connection.
Example:
set link poll retry
Enter poll retry count (0 = forever) [10]?
- link poll timeout
- Sets the amount of time the interface waits for a poll response before
timing out.
Example:
set link poll timeout
Enter poll timeout [2.0]?
- link role primary or secondary or
negotiable
- Configures the interface as an SDLC primary, secondary, or negotiable link
station (default is primary).
Notes:
- For DLSw, negotiable uses X'FF' (broadcast address) for
the initial poll.
When using broadcast address to negotiate the role, the link initially uses
a default SDLC configuration and then resolves to a configured station if the
specific address matches.
When primary is the link role, the link performs an initial poll
to a specific address.
- For APPN point-to-point or negotiable, the broadcast address is used for
the initial poll. For primary multipoint, the specific address is
used.
- For switched SDLC, the device must be primary, so link role
type is not configurable for SDLC dial circuit interfaces.
- link snrm timeout or retry
- Configures the following SNRM(E) information for primary stations:
- timeout
- The time to wait for an Unnumbered Acknowledgements (UA) response before
retransmitting an SNRM(E).
- retry
- The number of times to retransmit an SNRM(E) without receiving a response
before giving up.
Example:
set link snrm timeout
Enter SNRM response timeout [2.0]?
Example:
set link snrm retry
Enter SNRM retry count (0=forever) [6]?
- link speed
-
For internal clocking, use this command to specify the speed of the
transmit and receive clock lines.
For external clocking, this command does not affect the operation of the
WAN/serial line.
Valid Values:
Internal Clocking: 2400 to 2 048 000 bps
External Clocking: 2400 to 6 312 000 bps
| Note: | If you want to use a line speed greater than 2 048 000 bps when external
clocking is configured, you can only do this on:
- port 1 of the integrated WAN ports
- port 1 of the 4-port WAN CPCI or PMC adapter
All other WAN ports on the same adapter must be clocked at 64 000 bps or
less.
|
Example:
set link speed
Line Speed [64000]?
- link type multipoint or point-to-point
- Configures the SDLC link to either a multipoint link or a point-to-point
link. If the router is secondary, this parameter determines whether RTS
is controlled.
| Note: | For switched SDLC, the link is always point-to-point, so link type
is not configurable for SDLC dial circuit interfaces.
|
- link xid/test timeout or retry
- Configures the following XID/test information for primary stations:
- timeout
- The maximum amount of time to wait for an XID or TEST frame response
before retransmitting the XID or TEST frame.
- retry
- The maximum number of times an XID or TEST frame is resent before giving
up. A 0 (zero) causes the router to retry indefinitely.
- remote-secondary address or link_station_name
address <argument>
- Changes the remote station's SDLC address in the range 02 - FE.
Example: set remote-secondary SDLC_C1 address
ce
- station address or name address
- Changes the station's SDLC address in the range 01 to FE.
Example:
set station c1 address
Enter station address (in hex) [C1]?
- station address or link station name group-inclusion
no or yes
- For SDLC secondary stations, set whether to include this station in the
group poll list for this link. For this to be effective, add a
secondary group poll address using the set link group-poll
command.
Example: set station c1 group-inclusion
yes
- station gr-address-prim
- Specifies the router as primary group address that is to be polled.
A specific address cannot also be used as a group address.
Valid Values: X'00' to X'FE', where
X'00' indicates not using group poll
Default Value: X'00'
- station address or name max-packet
- The maximum size of the packet that the station can receive
(default: 2048). Do not set the maximum packet size larger than
the link frame size that is configured with the set link frame-size
command; if you do, the router automatically resets the maximum packet
size to the link frame size and issues the following ELS message:
SDLC.054: nt 3 SDLC/0 Stn xx-MaxBTU too large for Link adjusted (4096->2048)
Example:
set station c1 max-packet
Enter max packet size [2048]?
- station address or name name
- The name of the SDLC station.
Example:
set station c1 name
Enter station name [SDLC_C1]?
- station protocol
- Defines whether the station runs as 2-way-alternating (TWA) or
2-way-simultaneous (TWS).
| Note: | TWS requires full-duplex hardware.
|
- station address or name receive window
- The maximum number of frames the router can receive before sending a
response. The range is 1 to 7. The default is 7.
Example:
set station c1 receive-window
Enter receive window [7]?
| Note: | Ensure that the receive window size is sufficiently large, because the router
will disconnect the station if the window size is exceeded. Set the
receive window to the maximum value for the configured
modulo.
|
- station secondary-pause
- Specifies the amount of time the secondary station will delay sending poll
final after being polled.
Notes:
- This value should be less than the poll timeout for the primary
station.
- Values greater than 0 on multipoint links can cause poor response
time.
Valid Values: 0 to 25.5 seconds in increments of
0.1 seconds. A value greater than 0 is most useful on TWS
point-to-point links since it allows both directions to send at the same
time.
Default Value: 0
- station address or name transmit-window
- The maximum number of frames the router can transmit before receiving a
response frame. The range for MOD 8 is 1 to 7. The range for MOD
128 is 8 to 127.
Example:
set station c1 transmit-window
Enter transmit window [7]?
The monitoring environment is the GWCON process. To enter the GWCON
process:
- Enter talk 5 (or t 5) at the OPCON (*)
prompt. This brings you to the GWCON (+) prompt as shown in the
following example:
MOS Operator Console
For help using the Command Line Interface, press ESCAPE, then '?'
* talk 5
+
- Next, enter the network # command using the number
that identifies the interface that you previously configured for the SDLC
device.
+ network 2
SDLC Console
SDLC-2>
You enter all GWCON (Monitoring) commands at the + prompt.
Refer to "Getting Started" for information related to the monitoring environment.
This section summarizes and then explains the SDLC console and related
commands. Use these commands to gather information from the
database. Table 58 lists SDLC monitoring commands and their
function.
Table 58. SDLC Monitoring 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 SDLC link station
|
| Clear
| Clears the counters on the SDLC interface.
|
| Delete
| Dynamically removes an SDLC link station.
|
| Disable
| Disables connections to one SDLC link station.
|
| Enable
| Enables connections to one SDLC link station.
|
| List
| Displays SDLC link stations configurations and link station
information.
|
| Msgsz
| Permits monitoring bytes in data not otherwise visible.
Between 12 and 50 bytes for SDLC ELS messages 50 - 53 can be
displayed.
|
| Set
| Configures specific interface and link station
information.
|
| Test
| Tests the link between the router and the SDLC link
station.
|
| Exit
| Returns you to the previous command level. See "Exiting a Lower Level Environment".
|
Use the add command to add an end station. The router is,
by default the primary end station. If you do not use this command and
if you configured an SDLC station in DLSw or APPN, the end station is added
for you.
Syntax:
- add
- station
For an example and for additional information on the add
command, see "Add".
Use the clear command to clear counters for the interface, for a
station, or for all stations. Use the list all stations
command to list stations.
- Syntax: clear
- link
-
- station ...
- link name or address
- Clears the counters for an SDLC interface.
- station name or address or all
- Clears counters for a specific station or for all stations.
Use the delete command to terminate an existing SDLC connection
without affecting the SDLC configuration in SRAM. This command
terminates any SDLC session that may be in progress on the link
station. The router is considered the primary end station by
default.
Syntax:
- delete
- station name or address
Use the disable command to disable connection establishment on
one or all SDLC link stations without affecting the SDLC configuration in
SRAM. The disable command also terminates any existing
connection to the station.
- Syntax: disable
- link
-
- station . . .
- link
- Prevents connection on all configured SDLC link stations on the interface
by terminating all connections.
- station name or address
- Prevents connection to the specified end station (link station name) by
terminating any existing connection.
Use the enable command to enable connection establishment with
remote SDLC link stations without affecting the SDLC configuration
SRAM.
Syntax:
- enable
- link
-
- station . . .
- link
- Allows subsystems (for example, DLSw) to use SDLC's facilities.
- station name or address
- Allows connections to the specified end station.
Use the list command to display statistics specific to the data
link layer and the interface.
Syntax:
- list
- link configuration
-
- link counters
-
- station . . .
- link configuration
- Displays information for all configured SDLC link stations on the
interface.
For an example and for additional information on the list
command, see "List".
- link counters
- Displays information for the SDLC counters since the last router restart
or the last clear counters.
- I-Frames
- Total number of Information frames received and transmitted.
- I-Bytes
- Total number of Information bytes received and transmitted.
- Re-Xmit
- Total number of frames that were retransmitted.
- UI-Frames
- Total number of Unnumbered Information frames received and
transmitted.
- UI-Bytes
- Total number of Unnumbered Information bytes received and
transmitted.
- RR
- Total number Receive-Ready (RRs) received and transmitted.
- RNR
- Total number Receive-Not-Ready (RNRs) received and transmitted.
- REJ
- Total number of Rejects received and transmitted.
- UP
- Unnumbered Polls (group poll) received and transmitted.
- station all or address or link station
name
-
Displays the status of the specified SDLC link station or all
stations. The software displays an * next to the stations that
were not explicitly configured using the add station command but
were added to the configuration because they were defined and activated in the
protocol layer (DLSw or APPN).
Displays information for the specified SDLC link station (link station
name) on the interface.
- Address
- The address of the SDLC link station. The address in parentheses is
the group address of the station. A (00) indicates that a group address
is not defined.
- Name
- The character string name designation of SDLC link station.
- Status
- The status of the SDLC link station:
- Enabled
- Enabled, but not allocated
- Idle
- Allocated, but not in use
- Connected
- Connected
- Disconnected
- Disconnected
- Connecting
- Connection establishment in progress.
- Discnectng
- Disconnection in progress
- Recovering
- Attempting to recover from a temporary data link error.
- Max BTU
- The frame size limit of the remote station. This frame size must
not be larger than the maximum Basic Transmission Unit (BTU) packet size
configured with the set link frame-size command. The default
is 2048 bytes.
- Rx Window
- The size of the receive window.
- Tx Window
- The size of the transmit window.
- station name or address counters
- Displays frame transmit and receive counts for the specified link
station.
- I-Frames
- Number of information frames received and transmitted
- I-Bytes
- Number of information bytes received and transmitted
- Re-Xmit
- Number of frames retransmitted
- UI-Frames
- Number of Unnumbered Information frames received and transmitted
- UI-Bytes
- Number of Unnumbered Information bytes received and transmitted
- XID-Frames
- Number of Exchange Identification frames received and transmitted
- RR
- Number of Receive Ready frames received and transmitted
- RNR
- Number of Receive Not Ready frames received and transmitted
- REJ
- Number of Rejects received and transmitted
- TEST
- Number of Test frames received and transmitted
- SNRM
- Number of Set Normal Response Mode frames received and transmitted
- DISC
- Number of Disconnect frames received and transmitted
- UA
- Number of Unnumbered Acknowledgment frames received and transmitted
- DM
- Number of Disconnected Mode frames received and transmitted
- FRMR
- Number of Frame Reject frames received and transmitted
- UP
- Unnumbered Polls (group poll) received and transmitted.
Example:
SDLC-2> list link counters
I-Frames I-Bytes Re-Xmit UI-Frames UI-Bytes
-------- ------- ------- --------- --------
Send 0 0 0 0 0
Recv 0 0 0 0
RR RNR REJ UP
------- ------ ---- ---------
Send 0 0 0 0
Recv 0 0 0 0
SDLC-2> list station c1
Addr-A/S Rx Tx Secondary Primary
(Sec Gp) Name Status Max BTU Window Window Poll Pause GP Addr
-------- -------- ---------- ------- ------ ------ ----------- -------
C1 A SDLC_C1 ENABLED 2048 7 7 0.0 sec 00
Example:
SDLC-2> list station all
Addr-A/S Rx Tx Secondary Primary
(Sec Gp) Name Status Max BTU Window Window Poll Pause GP Addr
-------- -------- ---------- ------- ------ ------ ----------- -------
C1 A SDLC_C1 ENABLED 2048 7 7 0.0 sec 00
C2 A SDLC_C2 ENABLED 2048 1 7 0.0 sec 00
Example:
SDLC-2> list station c1 counters
I-Frames I-Bytes Re-Xmit UI-Frames UI-Bytes XID-Frames
---------- ---------- --------- ---------- ---------- ----------
Send 9 384 0 0 0 6
Recv 29 42792 0 0 3
RR RNR REJ TEST SNRM DISC
---------- ---------- --------- ---------- ---------- ----------
Send 598 0 0 0 1 0
Recv 587 0 0 0 0 0
UA DM FRMR UP
---------- ---------- --------- ---------
Send 0 0 0 0
Recv 1 0 0 0
Use the msgsz command to display between 12 and 50 bytes of SDLC
ELS messages 50 - 53.
Syntax:
- msgsz
-
- Enter between 12 and 50 bytes
- Specifies the number of bytes to be displayed. The default is 12
bytes.
Use the set command to dynamically configure specific
information for one or all SDLC link stations without affecting the SRAM
configuration. In the SDLC monitoring environment, the set
command can be executed only on disabled links or stations. All time
values are entered in seconds, with a 0.1 second resolution.
Syntax:
- set
- link
-
- group poll* ...
-
- inactivity ...
-
- modulo . . .
-
- name
-
- poll . . .
-
- protocol . . .
-
- role* . . .
-
- secondary-pause . . .
-
- snrm
-
- type* . . .
-
- xid/test
-
- station
-
- address. . .
-
- group-inclusion
-
- gp-address-prim
-
- max-packet
-
- name
-
- protocol
-
- receive-window
-
- secondary-pause
-
- transmit-window
| *Note: | These commands are not supported on SDLC dial circuit interfaces.
|
- link group-poll address
- Sets a group poll address for secondary stations on the link. The
SDLC software supports the IBM 3174 group poll function. Use the
add station or the set station group inclusion
command to include a station in the group poll list.
Example:
set link group-poll
Enter group poll address (in hex) [00:]?f3
Group poll support enabled
- link inactivity
- For idle NRM/E secondary stations, sets the time after which the interface
changes the station to its recovery state. The range is 0 to 7200
seconds. The default is 30. A 0 (zero) causes the station to
remain idle indefinitely.
Example:
set link inactivity
Enter secondary link station inactivity timeout :[30.0]?
- link modulo
- Dynamically changes the range of sequence numbers to be used on the data
link without affecting the SRAM configuration. Modulo 8 specifies a
sequence number range 0 - 7, and modulo 128 specifies 0 - 127. Default
is 8.
| Note: | When you change this value, the transmit and receive window sizes become
invalid. Use the set station command to change the
receive-window and transmit-window sizes.
|
- link name
- Dynamically changes the name of the link without affecting the SRAM
configuration. A maximum of 8 characters can be entered. This
parameter is for informational purposes only.
Example:
set link name
Enter link name: [LINK_0]?
- link poll delay or timeout or retry
- Dynamically changes the following poll information without affecting the
SRAM configuration.
- delay
- Configures the delay between each poll that is sent over the
interface.
- timeout
- Configures the amount of time the router waits for a poll response before
timing out.
- retry
- Configures the number of times the interface retries to poll the remote
SDLC link station before it closes the connection.
Example:
set link poll delay
Enter delay between polls [0.2]?
- link protocol
- Defines whether the station runs as TWA or TWS.
| Note: | TWS requires full-duplex hardware.
|
- link role primary, secondary, or
negotiable
- Configures the interface as an SDLC primary, secondary, or negotiable link
station. The default is primary. Use of this command does not
affect the SRAM configuration.
Notes:
- For DLSw, negotiable uses X'FF' (broadcast address) for
the initial poll.
When using broadcast address to negotiate the role, the link uses a default
SDLC configuration.
When primary is the link role, the link performs an initial poll
to a specific address.
- For APPN point-to-point or negotiable, the broadcast address is used for
the initial poll. For primary multipoint, the specific address is
used.
- For switched SDLC, the device must be primary, so link role
type is not configurable for SDLC dial circuit interfaces.
- link secondary-pause
- Specifies the amount of time the secondary station will delay sending poll
final after being polled.
Notes:
- This value should be less than the poll timeout for the primary
station.
- Values greater than 0 on multipoint links can cause poor response
time.
Valid Values: 0 to 25.5 seconds in increments of
0.1 seconds. A value of > 0 is most useful on TWS point-to-point
links since it allows both directions to send at the same time.
Default Value: 0
- link snrm timeout or retry
- For primary stations, dynamically changes the following SNRM(E)
information without affecting the SRAM configuration.
- timeout
- The time to wait for an Unnumbered Acknowledgment (UA) response before
retransmitting an SNRM(E).
- retry
- The number of times to retransmit an SNRM(E) without receiving a response
before giving up.
Example:
set link snrm timeout
Enter SNRM response timeout [2.0]?
- link type multipoint or point-to-point
- Dynamically changes the SDLC link to either a multipoint link or a
point-to-point link without affecting the SRAM configuration.
| Note: | For switched SDLC, the link is always point-to-point, so link type
is not configurable for SDLC dial circuit interfaces.
|
- link xid/test timeout or retry
- For primary stations, dynamically changes the following XID/test
information without affecting the SRAM configuration.
- timeout
- The maximum amount of time to wait for an XID or TEST frame response
before retransmitting the test frame.
- retry
- The maximum number of times an XID or TEST frame is resent before giving
up. A 0 (zero) causes the router to retry indefinitely.
-
-
| Note: | Examples for, and explanations of, the following parameters can be found in
the SDLC configuration chapter at "Set".
|
- station address or name address
- Changes the station's SDLC address.
- station group-inclusion
- For SDLC secondary stations, set whether to include this station in the
group poll list for this link. For this to be effective, add a
secondary group poll address using the set link group-poll
command.
Example: set station c1 group-inclusion
yes
- station gp-addres-prim
- Specifies the group address that is to be polled. A specific
address cannot also be used as a group address.
Valid Values: X'00' to X'FE', where
X'00' indicates not using group poll
Default Value: X'00'
- station address or name max-packet
- Maximum size of packet that this station can receive.
- station address or name name
- Name of the SDLC station.
- station protocol
- Defines whether the station runs as TWA or TWS.
| Note: | TWS requires full-duplex hardware.
|
- station address or name receive-window
- Maximum number of frames the router receives before an acknowledgement is
required.
- station secondary poll pause
- Specifies the amount of time the secondary station will delay sending poll
final after being polled.
Notes:
- This value should be less than the poll timeout for the primary
station.
- Values greater than 0 on multipoint links can cause poor response
time.
Valid Values: 0 to 25.5 seconds in increments of
0.1 seconds. A value greater than 0 is most useful on TWS
point-to-point links since it allows both directions to send at the same
time.
Default Value: 0
- station address or name transmit-window
- Maximum number of frames router transmits before receiving a response
frame.
Transmits a specified number of TEST frames to the specified station and
waits for a response. Use this command to test the integrity of the
connection. Press any key to cancel the test.
| Note: | Disable the specified link station before using this command
|
Syntax:
- test
- station name or address
#frames-to-send frame-size
Example:
test station c1
Number of frames to send [1]? 5
Frame length [265]?
Starting echo test -- press any key to abort
5 frames sent, 5 frames received, 0 compare errors, 0 timeouts
- Number of test frames to send
- Total number of frames to send.
- Frame length
- Length of frames to be sent. Frame length cannot be larger than the
maximum frame length of the specified station.
The test may be aborted by pressing any key.
While the SDLC interface has a console process for operational purposes,
the 2212 also displays complete statistics for installed interfaces when you
use the interface command from the GWCON environment. (For
more information on the interface command, refer to "The Operating/Monitoring Process (GWCON - Talk 5) and Commands".)
Using the interface command, you can display statistics for SDLC
devices without entering the SDLC monitoring process. To do this, enter
the interface command and an interface number at the +
prompt.
- Nt
- Indicates the interface number as assigned by software during initial
configuration.
- Nt'
- Indicates the interface number as assigned by software during initial
configuration.
| Note: | For SDLC interfaces, the Nt' interface number is always the same as the
Nt interface number.
|
- Slot
- Indicates the slot number of the interface that is running SDLC.
- Port
- Indicates the port number of the interface that is running SDLC.
- Self-test passed
- Indicates the total number of times the SDLC interface passed its
self-test.
- Self-test failed
- Indicates the total number of times the SDLC interface was unable pass its
self-test.
- Maintenance failed
- Indicates the number of maintenance failures.
The following parameters are displayed only if a cable is connected.
The information displayed depends on the cable that is connected.
Different parameters are displayed with other cables.
- Adapter cable
- Indicates the type of adapter cable that the level converter is
using.
- V.24 circuit
- Indicates the circuits being used on the V.24.
- Nicknames
- Indicates the signals being used on the V.24 circuit.
- RS-232
- The EIA 232 (RS 232) circuit names.
- State
- Indicates the state of V.24 circuits, signals, and pin assignments
(ON or OFF).
- Line speed (configured)
- Indicates the currently configured line speed for the SDLC
interface.
- Last port reset
- Indicates how long ago the port was last reset.
- Input frame errors
- Indicates the input frame error type (CRC error, too short, aborted,
alignment, too long, DMA/FIFO overrun) and the total number of errors that
have occurred.
- Output frame counters
- Indicates the total number of DMA/FIFO overruns and output aborts sent for
output frames.
- Missed frame
- When a frame arrives at the device and there is no buffer available, the
hardware drops the frame and increments the missed frame counter.
- L & F bits not set
- On serial interfaces, the hardware sets input-descriptor information for
arriving frames. If the buffer can accept the complete frame upon
arrival, the hardware sets both the Last and First bits of the frame,
indicating that the buffer accepted the complete frame. If either of
the bits is not set, the packet is dropped, the L & F bits not
set counter is incremented, and the buffer is cleared for reuse.
| Note: | It is unlikely that the L & F bits not set counter will be
affected by traffic.
|
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