# 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
- Displaying the Current Override Setting

## 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:

host1:boston(config-l2tp-dest-profile-host)#session-out-of-resource-result-code-override

## 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

#### Related Documentation

- session-out-of-resource-result-code-override
- show l2tp destination profile