HP X.25/9000 User's Guide HP-UX 11i v3 (5900-1523, August 2011)

Figure 17 Before the failover
When the lan0 (the primary LAN card) fails, the XOL interface stops on lan0, and a XOL interface
is brought up automatically on lan1 (the standby LAN card on system A) using the same
configuration file. An attempt is made to configure lan0 with the factory default MAC address,
and uMAC is assigned to lan1 on system A during the local failover. The X.25 connection must
be re-established on the XOL interface. When the card lan0 comes up later, it is configured with
the factory default MAC address.
Figure 18 After the failover
To configure XOL local failover, complete the following steps:
Configuring the high availability feature for X.25 over LLC2 63