Technical Documentation
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Overriding LNS Out-of-Resource Result Codes 4 and 5
When the number of L2TP sessions reaches the configured maximum value, the LNS sends an out-of-resource result code (4 or 5) in a CDN (Call-Disconnect-Notify) message to the LAC. This signals the LAC to fail over to another LNS that has the resources for more sessions.
Some third-party LAC implementations fail over only when they receive result code 2 sent in the CDN from the LNS. You can override result codes 4 and 5 with result code 2 on the LNS to enable such routers to fail over to another LNS. These codes have the following meanings:
- 2—Call disconnected for the reason indicated in error code
- 4—Call failed due to lack of appropriate facilities being available (temporary condition)
- 5—Call failed due to lack of appropriate facilities being available (permanent condition)
The following sections describe how to override the result codes and how to display the current code values.
Overriding the Result Codes
You can override the out-of-resource result codes 4 and 5 by issuing the session-out-of-resource-result-code-override command on the LNS.
- To override result codes 4 and 5:
Displaying the Current Override Setting
You can view the current override setting for the LNS result codes in the L2TP destination profile.
- To display the current override setting:
ERX(config)#show l2tp destination profile boston
L2TP destination profile boston
Configuration
Destination address
Transport ipUdp
Virtual router default
Peer address 10.10.76.12
Statistics
Destination profile current session count is 0
Host profile attributes
Remote host is LAC
Configuration
Tunnel password is TunnelPass
Local host name is LNS
Local ip address is 46.1.1.2
Disconnect-cause avp is enabled
Tunnels are single-shot
Override out-of-resource-result-code is enabled
Statistics
Current session count is 0
1 L2TP host profile found