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LAC Interoperation with Third-Party LNS Devices
In some network environments, the LAC may need to interoperate with an LNS configured on a device from another vendor that does not run Junos OS. Interoperation with Cisco Systems devices requires the LAC to communicate a NAS port type, but the LAC does not provide this information by default. You can enable interoperation with Cisco devices by configuring the LAC to send information to the LNS about the NAS port and port type.
You can use either of the following ways to specify the LAC’s NAS port method, which controls whether the LAC sends the NAS port information to the LNS:
- Include the nas-port-method statement in the tunnel profile configured on the LAC at the [edit access tunnel-profile] hierarchy level. Specify cisco-avp as the method.
- Include the Tunnel-Nas-Port-Method VSA [26–30] in your RADIUS server configuration with the value set to 1 to indicate Cisco CLID.
The value configured in RADIUS has precedence over the value configured in the CLI when both are configured.
Both methods cause the LAC to include the Cisco Nas Port Info AVP (100) when it sends an incoming call request (ICRQ) to the LNS. The AVP includes information that identifies the NAS port and indicates whether the port type is ATM or Ethernet.
When the LNS is a Cisco device, it uses the AVP to facilitate interoperation. When the LNS is an MX Series router, the LNS simply ignores this AVP, unless the LNS is configured for L2TP tunnel switching. In that case, the LNS preserves the value of the AVP and passes it along when it switches tunnels for the LAC.
