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 Numbx``er 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.

• Descriptive format—This is the default format, and includes the following elements:

  <interface ID> <delimit> <UID> <delimit> <interface description> <delimit> <connect info> <delimit> <PPPoE description>

• Descriptive include-agent-circuit-id format—This format includes the following elements:

  <interface ID> <delimit> <UID> <delimit> <interface description> <delimit> <connect info> <delimit> <PPPoE description> <delimit> <agent-circuit-id>

• Descriptive include-agent-circuit-id include-agent-remote-id format—This format includes the following elements:

  <interface ID> <delimit> <UID> <delimit> <interface description> <delimit> <connect info> <delimit> <PPPoE description> <delimit> <agent-circuit-id> <delimit> <agent-remote-id>

• Descriptive include-agent-remote-id format—This format includes the following elements:

  <interface ID> <delimit> <UID> <delimit> <interface description> <delimit> <connect info> <delimit> <PPPoE description> <delimit> <agent-remote-id>

• Fixed format—This format is similar to the fixed format of RADIUS attribute 31 (Calling-Station-Id). If you set up the router to generate the Calling Number AVP in fixed format, the router formats the AVP as follows (the maximum number of characters for each field is shown in brackets):
  • For ATM: <system name [4]> <slot [2]> <port [1]> <VPI [3]>
    <VCI [5]>
  • For Ethernet interfaces without an S-VLAN ID:
    <system name [4]> <slot [2]> <port [1]> <VLAN [8]>
  • For Ethernet interfaces with an S-VLAN ID:
    <system name [4]> <slot [2]> <port [1]> <S-VLAN [4]> <VLAN [4]>

    By default, the fixed format Calling Number AVP for Ethernet interfaces does not include a stacked VLAN (S-VLAN) ID. To include a 4-byte S-VLAN ID in the fixed format for Ethernet interfaces, you must issue the aaa tunnel calling-number-format fixed stacked command. The S-VLAN ID is displayed in decimal format in the range 0–4095.

    The S-VLAN ID field in the Calling Number AVP is set to 0 (zero) under the following conditions:

    • You do not specify the optional stacked keyword.
    • You specify the optional stacked keyword but the Ethernet interface does not have an S-VLAN ID.
  • Example—Ethernet interface with S-VLAN ID and VLAN ID

    The following example shows the fixed format Calling Number AVP for an Ethernet interface with system name western (west in example), slot number 4 (04 in example), port number 3 (3 in example), S-VLAN ID 8 (0008 in example), and VLAN ID 12 (0012 in example).

    west04300080012

• Include-agent-circuit-id format—This format includes the following element:

  <agent-circuit-id>

• Include-agent-circuit-id include-agent-remote-id format—This format includes the following elements:

  <agent-circuit-id> <delimit> <agent-remote-id>

• Include-agent-remote-id format—This format includes the following element:

  <agent-remote-id>

1. Calling Number AVP 22 Configuration Tasks
2. Configuring the Fallback Format
3. Disabling the Calling Number AVP

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 stackedkeyword 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. You can specify either descriptive format or fixed format.

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

• To configure the fallback AVP format:

  host1(config)#aaa tunnel calling-number-format-fallback fixed

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.

• To prevent the LAC from sending the Calling Number AVP:

  host1(config)#l2tp disable calling-number-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:

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:

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.