Configuring Calling Number AVP Formats

The E Series LAC generates L2TP Calling Number AVP 22 for incoming-call request (ICRQ) packets that the LAC sends to the LNS. By default, the E Series LAC generates the Calling Number AVP 22 in descriptive format.

You can also prevent the E Series LAC from sending the Calling Number AVP in ICRQ packets.

Note: You cannot change the L2TP Calling Number AVP on tunnel switched interfaces.

You use the aaa tunnel calling-number-format command to configure the router to generate AVP 22 in any of the following formats. Agent-circuit-id is suboption 1 of the tags supplied by the PPPoE intermediate agent from the DSLAM. Agent-remote-id is suboption 2.

Tasks for configuring the L2TP Calling Number AVP 22 include:

Calling Number AVP 22 Configuration Tasks

To set up the router to generate Calling Number AVP 22 for an Ethernet interface in fixed format that includes both an S-VLAN ID and a VLAN ID:

  1. Set the calling number format of the tunnel to fixed, and specify the optional stacked keyword to include the S-VLAN ID.
    host1(config)#aaa tunnel calling-number-format fixed stacked
  2. Set the format of the RADIUS Calling-Station-Id to fixed-format, and specify the optional stacked keyword to include the S-VLAN ID.
    host1(config)#radius calling-station-format fixed-format stacked

If you use a RADIUS server to authenticate the L2TP tunnel parameters, you must configure the format for both the L2TP Calling Number AVP 22 (by using the aaa tunnel calling-number-format command) and the RADIUS Calling-Station-ID [31] attribute (by using the radius calling-station-format command).

However, if you use an AAA domain map to authenticate the L2TP tunnel parameters, you need configure only the L2TP Calling Number AVP 22 format by using the aaa tunnel calling-number-format command. You need not configure the format of the RADIUS Calling-Station-ID [31] attribute in this case.

Configuring the Fallback Format

You can configure a fallback AVP 22 format. The E Series LAC uses the fallback format to generate the L2TP Calling Number AVP 22 in the event that the PPPoE agent ID is null or unavailable. The LAC uses the fallback format only when the configured calling number format includes either or both of the agent-circuit-id and agent-remote-id suboptions.

The calling number format determines what element triggers use of the fallback format, as shown in the following table:

Calling Number Format

Fallback Trigger

agent-circuit-id

agent-circuit-id is empty

agent-circuit-id include-agent-remote-id

Both agent-circuit-id and agent-remote-id are empty.

agent-remote-id

agent-remote-id is empty

descriptive include-agent-circuit-id

agent-circuit-id is empty

descriptive include-agent-circuit-id include-agent-remote-id

Both agent-circuit-id and agent-remote-id are empty.

descriptive include-agent-remote-id

agent-remote-id is empty

You use the aaa tunnel calling-number-format-fallback command to configure the router to generate any of the following fallback AVP 22 formats:

Disabling the Calling Number AVP

You can use the l2tp disable calling-number-avp command to prevent the E Series LAC from sending the Calling Number AVP in ICRQ packets. You use this command in special situations where you do not want the LAC to send this AVP.

For more information about setting up the router to generate Calling Number AVP 22 in a format that includes either or both of the agent-circuit-id and agent-remote-id suboptions of the tags supplied by the PPPoE intermediate agent, see Configuring PPPoE Remote Circuit ID Capture in the JunosE Link Layer Configuration Guide.

Calling Number AVP 22 Configuration Examples

The following examples show how you can synchronize the contents of RADIUS Calling-Station-Id (Attribute 31) and L2TP Calling-Number (AVP 22).

  • To send the PPPoE agent-circuit-id in RADIUS Attribute 31 and L2TP AVP 22 and specify that the fixed format is used when the PPPoE agent-circuit-id is unavailable, issue the following commands:
    host1(config)#radius calling-station-format fixed-format host1(config)#radius remote-circuit-id-delimiter # host1(config)#radius override calling-station-id remote-circuit-id host1(config)#radius remote-circuit-id-format agent-circuit-id host1(config)#aaa tunnel calling-number-format include-agent-circuit-id host1(config)#aaa tunnel calling-number-format-fallback fixed
  • To send the PPPoE agent-circuit-id and agent-remote-id in RADIUS Attribute 31 and L2TP AVP 22 and specify that the fixed format is used when both PPPoE agent-circuit-id and agent-remote-id are unavailable, issue the following commands:
    host1(config)#radius calling-station-format fixed-format host1(config)#radius remote-circuit-id-delimiter # host1(config)#radius override calling-station-id remote-circuit-id host1(config)#radius remote-circuit-id-format agent-circuit-id agent-remote-id host1(config)#aaa tunnel calling-number-format include-agent-circuit-id include-agent-remote-id host1(config)#aaa tunnel calling-number-format-fallback fixed