3Com MSR 50 Series Configuration Manual page 515

[RouterA] interface bri 3/0
[RouterA-Bri3/0] rip metricin 2
# Enable the dynamic route backup function.
[RouterA-Bri3/0] standby routing-group 1
2 Configure Router B
# Enable X.25 on Router B.
<RouterB> system-view
[RouterB] x25 switching
# Enable switching interfaces for X.25.
[RouterB] interface serial 2/0
[RouterB-Serial2/0] link-protocol x25 dce ietf
[RouterB-Serial2/0] quit
[RouterB] interface serial 2/1
[RouterB-Serial2/1] link-protocol x25 dce ietf
[RouterB-Serial2/1] quit
# Create two SVC routes.
[RouterB] x25 switch svc 10 interface serial 2/0
[RouterB] x25 switch svc 15 interface serial 2/1
3 Configure Router C
# Configure a dialer rule.
<RouterC> system-view
[RouterC] dialer-rule 1 ip permit
# Configure dialup parameters for BRI 3/0.
[RouterC] interface bri 3/0
[RouterC-Bri3/0] ip address 20.0.0.2 8
[RouterC-Bri3/0] dialer enable-circular
[RouterC-Bri3/0] dialer-group 1
[RouterC-Bri3/0] quit
# Configure Serial 2/1 and enable X.25 on it.
[RouterC] interface serial 2/1
[RouterC-Serial2/1] link-protocol x25 dte ietf
[RouterC-Serial2/1] x25 x121-address 15
[RouterC-Serial2/1] x25 map ip 10.0.0.1 x121-address 10 broadcast
[RouterC-Serial2/1] ip address 10.0.0.2 8
[RouterC-Serial2/1] quit
# Configure the interface loopback 1.
[RouterC] interface loopback 1
[RouterC-Loopback1] ip address 30.0.0.1 32
[RouterC-Loopback1] quit
Dynamic Route Backup Configuration Example 515