IBM Books

Software User's Guide Version 3.3

Configuring and Monitoring Dial Circuits

This chapter describes how to configure dial circuits on a dial circuit interface mapped to a V.25bis , V.34, or ISDN interface. It contains the following sections:

Dial-in and Dial-out interfaces are special types of dial circuit interfaces.

Notes:

  1. PPP dial circuit interfaces can use an ISDN, V.25bis, or V.34 network as the base-network interface.

  2. FR dial circuit interfaces can use an ISDN or a V.25bis network as the base network interface.

  3. Switched SDLC Call-In dial circuit interfaces use a V.25bis network as the base-network interface.

  4. X.25 circuits can be used over ISDN D-channels for BRI.

  5. Dial-Out circuit interfaces use a V.34 network as the base-network interface.

  6. Dial-In circuit interfaces can use an ISDN network as the base-network interface.

For information on how to configure dial circuits for use with:

Adding a Dial Circuit On a Leased Line

Adding a dial circuit onto a leased line will set the following default values:

SET ANY_INBOUND

SET DESTINATION
default_address

SET IDLE
0

SET LIDS
no
Note:If you are configuring a V.34 interface to be in leased line mode, the following parameters cannot be configured:

Dial Circuit Configuration Commands

Table 71 describes the dial circuit configuration commands. Enter the dial circuit configuration commands at the Circuit Config> prompt. You must restart the router for configuration changes to take effect.

To access the Circuit Config> prompt, enter the network command followed by the interface number of the "dial circuit". (The dial circuit number was assigned when you entered the add device dial-circuit command.) You can enter the list devices command at the Config> prompt to display a list of the dial circuits that you added.

Table 71. Dial Circuit 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".
 Delete   Deletes the inbound call settings from the dial circuit configuration. 
 Encapsulator   Allows you to change the data-link protocol configuration. 
 List   Displays the dial circuit configuration parameters. 
 Set   Configures the dial circuit for inbound or outbound calls, maps the dial circuit to a serial line interface, and sets addresses, idle timeout, priority, lid_out address, inbound destination, and self-test delay. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

Delete

Use the delete command to remove the inbound call settings from the dial circuit configuration.

Syntax:

delete
inbound destination

inbound destination
Removes both the INBOUND destination and the ANY_INBOUND settings from the dial circuit configuration. This causes the dial circuit to accept calls only from callers that have a phone number that matches the destination parameter.

Encapsulator

Use the encapsulator command to enter the configuration process for the link-layer protocol (for example. PPP, Frame Relay, X.25 , dial-out, SDLC) that is running on the dial circuit interface.
Note:The default for a dial circuit interface created via the add device dial-circuit command is PPP. To change the link layer type, at the Config> prompt:

  • For Frame Relay, enter set data-link frame-relay.

  • For SDLC, enter set data-link sdlc.

  • For X.25 on the ISDN BRI D-channel, enter set data-link x25.

Syntax:

encapsulator
 

The following example shows that the PPP configuration process is entered when the encapsulator command is used for a PPP dial circuit or dial-in interface.

Example: 

encapsulator
Point-to-Point user configuration
PPP Config>

Be aware of the following when you configure a dial circuit that uses a V.25bis interface as the base network:

Be aware that you cannot configure HDLC parameters of the dial circuit configuration when you configure PPP or Frame Relay for ISDN. Physical layer parameters are configured on the ISDN interface.

For information on configuring the PPP protocol, refer to "Configuring Serial Line Interfaces" or refer to "Using Point-to-Point Protocol Interfaces".

For information on configuring the Frame Relay protocol, see "Using Frame Relay Interfaces" or "Configuring and Monitoring Frame Relay Interfaces".

For information on configuring or monitoring SDLC interfaces, see "Using SDLC Interfaces" or "Configuring and Monitoring SDLC Interfaces".

For more information on configuring dial-in and dial-out interfaces, see "Using a Dial-In Access to LANs (DIALs) Server" in the Using and Configuring Features.

For information on configuring or monitoring X.25 interface, see "Configuring and Monitoring the X.25 Network Interface".

To return to the Circuit Config> prompt, use the exit command.

List

Use the list command to display the current dial circuit configuration.

For more information about I.430 and I.431, see "ISDN I.430 and I.431 Switch Variants".

Syntax:

list
 

Example:
Note:Options listed depend upon the type of interface used. All options may not be shown for all interface types. 

list
Any inbound             set
Bandwidth:              64
Base net:               1
Callback:               yes
Calls:                  inbound
Destination name:       remote-site-sanfrancisco
Idle char:              7E
Idle timer:             = 60 sec
Inbound calls           allowed
Inbound dst name:       local-1
LID out address:        1234
LID used:               enabled
Net #:                  2
Outbound calls          allowed
Priority:               8
SelfTest Delay Timer:   = 0 ms
Time slot:              1 4 5 8

Any inbound
Displays this setting when inbound calls that do not match any other dial circuit are mapped to this circuit and accepted as inbound calls.

Bandwidth
Displays the bandwidth value in Kbps.

Base net
Displays the name of the serial line interface to which this dial circuit is mapped.

Callback
Displays the setting of this option.

Calls
Displays the setting of this option.

Destination name
Displays the network address name to be called for outbound circuits, and the default comparison address used by the LID mechanism for inbound calls.

Idle char
Displays the idle character used for I.43x or channelized circuits.

Idle timer
Displays the idle timer setting in seconds. The range is 0 to 65535; 0 indicates that this is a dedicated circuit (leased line).

Inbound calls allowed
Displays this parameter when the circuit is configured to accept inbound calls.

Inbound dst name
Displays this parameter if the circuit is configured to accept inbound calls that do not match any other addresses. This is an alternate comparison address name used by the LID mechanism for inbound calls.

LID out address
Displays the name of the dial circuit connecting the routers.

LID used
Displays the setting of this option.

Net #
Displays the base circuit number.

Outbound calls allowed
Displays this parameter when the circuit is configured to initiate outbound calls.

Priority
Displays the setting of this parameter.

SelfTest Delay Timer
Displays the self-test delay timer setting in milliseconds. The range is 0 to 65535; 0 indicates no delay.

Time slot
Displays the list of slots to use for this dial circuit.

Set

Use the set command to map the dial circuit to an interface (for example: ISDN or V.25bis), configure the dial circuit for inbound and/or outbound calls, and set destination addresses, inbound addresses, idle timeout, and self-test delay.
Note:

Notes:

  1. If you are running SDLC, I.430, I.431, Channelized, or X.25 on a dial circuit, you will be unable to use the set command to change the following parameters as the software will use specific defaults:

  2. If you are running a dial circuit on V.34, you will be unable to change the following parameters:

Syntax:

set
any_inbound

bandwidth...

callback...

 
calls...

 
destination...

 
idle...

 
idle-char...

 
inbound destination...

 
lid_out_addr...

lid_used...

net...

 
priority...

 
selftest-delay...

timeslot...
Note:If you are configuring a V.34 interface to be in leased line mode, the following parameters cannot be configured:

  • callback

  • calls

  • destination name

  • destination address/subaddress

  • idle

  • inbound destination

  • lid_used

  • priority

any_inbound
Specifies that inbound calls that do not match any other dial circuit will be mapped to this circuit and accepted as inbound calls.

bandwidth kbps
Sets the bandwidth, in Kbps, for ISDN, I.430, and Channelized T1/E1 circuits .

Valid values:

For I.430: 64 or 128

For Channelized: 56 or 64

For ISDN: 56 or 64

Default value: 64

callback [Yes or No]
The callback feature uses the callers telephone number to verify the call against an authentication table and then disconnects the incoming call. Callback then makes an outgoing call to the same caller. Callback should always be disabled. The default is no.

calls [outbound or inbound or both]
Restricts this dial circuit to initiating outbound calls only, accepting inbound calls only, or both initiating and accepting calls. The default is both.

destination address_name
This parameter is required for the dial circuit to operate. It specifies the network dial address of the remote router to which this dial circuit will connect. The LID protocol uses this parameter as the default comparison address for incoming calls. This parameter must match an address name that you assigned using the Config> prompt with either the add isdn address command, the add v25-bis address command, or the add v34-address command.

Example: set destination remote-site-sanfrancisco

idle # of seconds
Specifies a timeout period for the circuit. If there is no protocol traffic over the circuit for this specified time period, the dial circuit hangs up. The range is 0 to 65535, and the default is 60 seconds. A setting of zero specifies that there is no timeout period and that this is a dedicated circuit.

Notes:

  1. For WAN Restoral operations, you must set the idle timeout to 0.

  2. On a I.43x, X.25 or Channelized circuit, you cannot set this parameter.

idle-char
Specifies the idle character used for I.43x or channelized circuits.
Note:You cannot configure this parameter for regular ISDN circuits.

Valid values: 7E or FF

Default value: 7E

Example: set idle-char 7E

inbound-destination address_name
Set this parameter if the dial circuit is set up for both inbound and outbound calls and if this router's local dial address is different from the destination dial address that the remote router dials. For example, the numbers would be different if one of the routers must go through a PBX, international, or inter-LATA exchange. This parameter must match an address name that you assigned at the Config> prompt with either the add isdn address command, the add v25-bis address command, or the add v34-address command. The inbound destination number is used to match the incoming LID or CallerID with the dial circuit. If there is a match that dial circuit gets the call.

Example: set inbound remote-site-1

lid_out_addr address_name
The lid_out_addr is the name of a dial circuit between two routers. When more than one circuit is configured between two routers (parallel circuits), then there needs to be a way to unambiguously know which dial circuit connects between them. For this purpose, a lid_out_addr is sent from the router at one end (the caller). At the receiving end the other router configures the same string as the inbound destination name. The lid_out_addr must be an address name that has previously been added using ADD ISDN-ADDRESS from the config> prompt.

lid_used [enabled or disabled]
Suppresses the exchange of logical ids for circuits to devices that do not support logical ids.

Valid values: Enabled or disabled

Default value: Disabled

net  #
Sets the base network number of the interface to the # of the serial line interface to which you want to map this circuit.
Note:The interface must be a V.34 net for dial-out interfaces. You are prompted for this if you add the device.

Example: 

Circuit Config> set net
Base net for this circuit [ ]? 2

priority
The priority field allows an outbound dial-on-demand circuit to preempt another when no channels are available. If a call request is made and all the channels are in use, then the priority of the requesting dial-on-demand circuit is checked against all the active dial-on-demand circuits. If there is an outbound dial-on-demand circuit with lower priority, then that circuit is disconnected and a call is made for the higher priority dial-on-demand circuit. Only the priority on the outbound end of a connection is considered. An inbound dial-on-demand call will not be taken down in favor of a higher priority outbound call. An inbound dial-on-demand call cannot cause a lower priority call to be taken down.

selftest-delay # of milliseconds
Use this parameter to delay the time between when the call is established and the time when the initial packet is sent. Setting a selftest-delay can prevent initial packets from being dropped. The range is 0 to 65535, and the default is 150.

For V.25bis dial circuits, adjust this setting if your modems take extra time to synchronize.

For ISDN dial circuits, you may need to adjust this setting for dial-on-demand links because some ISDN switches start to deliver data before signalling the complete establishment of the circuit at the destination end.

timeslot list of slots
Specifies a slot or list of slots to use for this dial circuit. Your service provider will issue the number of the slots you can use for the circuit. Specify the list as slot numbers separated by blanks.
Note:You can only use this parameter for Channelized T1/E1 circuits.

Valid values:

For Channelized T1: 1 to 24

For Channelized E1: 1 to 31

Default value: None

Example: set timeslot 1 4 5 8

Dial Circuit Monitoring Commands

Table 72 describes the dial circuit monitoring commands. Enter the dial circuit monitoring commands at the Circuit Config> prompt. You must restart the router for monitoring changes to take effect.

Table 72. Dial Circuit 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".
 Callback   Adds, deletes, or lists the information in the authentication cache. 
Exit Returns you to the previous command level. See "Exiting a Lower Level Environment".

Callback

Use the callback command to add, delete or list the information in the authentication cache.

Syntax:

callback
add

delete

list

add
Adds a callback number to the authentication lists.

delete
Deletes a callback number from the authentication lists

list
Lists the callback numbers and other information in the authentication list.

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