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# Sending Interface Descriptions to AAA

During authentication the router sends ATM interface descriptions to AAA. AAA passes the descriptions to RADIUS, and they can appear in the Calling-Station-Id attribute [31]. (For information about RADIUS and the Calling-Station-ID attribute, see JUNOSe Broadband Access Configuration Guide.)

By default, the router sends the major interface descriptions to AAA on the SRP. You can configure the router to send VP interface descriptions in place of the major interface descriptions, or to send ATM 1483 subinterface descriptions to AAA on the line module. As a result, the VP or ATM 1483 subinterface descriptions can provide a convenient way to identify or group broadband access subscribers.

If you set up multiple interface descriptions, they have the following precedence:

1. ATM 1483 subinterface description
2. VP interface description
3. Major interface description

## Assigning Descriptions to Virtual Paths

To assign a description to an individual VP on an ATM interface, use the atm vp-description command. The VP description does not affect existing descriptions configured for the ATM interface or ATM 1483 subinterface on which the VP resides. However, if you delete the ATM interface, the descriptions of all VPs residing on that interface are also deleted. In addition, if you decrease the VPI range by issuing the atm vc-per-vp command, the router deletes the descriptions of any VPs that are removed.

To display the VP description, use the show atm vp-description command, as described in Using ATM show Commands. Although you need not configure a VP tunnel to specify a VP description, the router also displays the VP description in the output of the show atm vp-tunnel command.

## Exporting ATM 1483 Subinterface Descriptions

To assign a description to an ATM 1483 subinterface and configure the router to send the ATM 1483 VC interface descriptions to the line module:

1. Configure a text description for ATM 1483 subinterfaces with the atm atm1483 description command. This description is included in the interface identifier that is sent to AAA.

   To configure this feature for ATM 1483 subinterfaces, enter this command in Profile Configuration mode. See Configuring ATM 1483 Dynamic Subinterfaces in Configuring Dynamic Interfaces Using Bulk Configuration.

   `
   host1(config-subif)#atm atm1483 description VC_atm1
   `
2. Set up the router to export ATM 1483 VC interface descriptions to the line module.
   `
   host1(config)#atm atm1483 export-subinterface-description
   `
3. (Optional) Display the configuration of the export ATM 1483 VC interface descriptions feature with the show atm atm1483 command.

       host1#show atm atm1483
       ATM1483 IF Descriptions exported

4. (Optional) Display the interface descriptions with the show atm subinterface atm command.

atm atm1483 description

- Use to assign a text description or alias to an ATM 1483 subinterface.
- The description can be a maximum of 255 characters.
- Example
  `
  host1(config-subif)#atm atm1483 description nyc33
  `
- Use the no version to remove the text description or alias.
- See atm atm1483 description.

atm atm1483 export-subinterface-description

- Use to export ATM 1483 VC interface descriptions to the line module. Descriptions for ATM 1483 subinterfaces are configured with the atm atm1483 description command.
- The description can have up to 255 characters; however, when the description is sent to the line module, it is truncated to 32 characters.
- Example
  `
  host1(config)#atm atm1483 export-subinterface-description
  `
- Use the no version to restore the default behavior, in which ATM 1483 interface descriptions are not exported to the line module.
- See atm atm1483 export-subinterface-description.

atm vp-description

- Use to assign a text description to an individual VP on an ATM interface or subinterface.
- You must specify the VPI of the VP to which you want to assign the description.
- The description string can be a maximum of 32 characters.
- The VP description is stored in NVS and persists after a reboot.
- Use the show atm vp-description command to display the text description.
- Example
  `
  host1(config-if)#atm vp-description 2 vpi2Subscribers
  `
- Use the no version to restore the default value, a null string.
- See atm vp-description.

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