Example Iii - 3Com MSR 50 Series Configuration Manual

518 C 27: D
HAPTER YNAMIC

Example III

R B C
OUTE ACKUP ONFIGURATION
[RouterB] ospf
[RouterB-ospf-1] area 0
[RouterB-ospf-1-area-0.0.0.0] network 10.0.0.0 0.255.255.255
[RouterB-ospf-1-area-0.0.0.0] network 20.0.0.0 0.255.255.255
[RouterB-ospf-1-area-0.0.0.0] network 40.0.0.0 0.0.0.0
[RouterB-ospf-1-area-0.0.0.0] import-route direct
Network requirements
Router A is connected to Router B through a X.25 network.
■
Router A and Router B are connected to the ISDN switched network through
■
ISDN BRI interfaces. Router A and Router B can dial each other through the
shared DCC. The telephone number of Router A is 8810010, and that of
Router B is 8810052.
As the master device of the dynamic route backup function, Router A monitors
■
the network segment 30.0.0.0/8 on Router B.
Normally, the X.25 link functions as the primary link between Router A and
■
Router B. When the route to the network segment where Router B resides
disconnects (for example, when the X.25 network fails), Router A will activate
the ISDN BRI link automatically.
Network diagram
Figure 146 Network diagram for dynamic route backup configuration
Router A
BRI3/0
20 .0.0.1/24
ISDN BRI Dedicated line
S2/0
10.0.0 .1/8
Configuration procedure
1 Configure Router A
# Configure a dialer rule and configure a local user database.
<RouterA> system-view
[RouterA] dialer-rule 1 ip permit
[RouterA] local-user userb
[RouterA-luser-userb] password simple userb
[RouterA-luser-userb] service-type ppp
[RouterA-luser-userb] quit
# Create a dynamic route backup group.
[RouterA] standby routing-rule 1 ip 30.0.0.1 32
# Configure the shared DCC on Dialer 0.
Router B
BRI3/0
20.0.0.2 /24
S2/0
10.0 .0.2/8
X.25
Loop 1
30.0.0 .0/8