C - connect, S - static, r - rip, o - ospf, b - bgp
# DST-ADDRESS G GATEWAY DISTANCE INTERFACE
0 Do 192.168.0.0/24 r 10.1.0.2 110 to_main
1 Io 10.3.0.0/24 110
2 DC 10.3.0.0/24 r 0.0.0.0 0 backup
3 Do 10.2.0.0/24 r 10.1.0.2 110 to_main
4 Io 10.1.0.0/24 110
5 DC 10.1.0.0/24 r 0.0.0.0 0 to_main
On OSPF_peer_2:
[admin@OSPF_peer_2] > ip route print
Flags: X - disabled, I - invalid, D - dynamic, J - rejected,
C - connect, S - static, r - rip, o - ospf, b - bgp
# DST-ADDRESS G GATEWAY DISTANCE INTERFACE
0 Do 192.168.0.0/24 r 10.2.0.2 110 to_main
1 Io 10.3.0.0/24 110
2 DC 10.3.0.0/24 r 0.0.0.0 0 to_peer_1
3 Io 10.2.0.0/24 110
4 DC 10.2.0.0/24 r 0.0.0.0 0 to_main
5 Do 10.1.0.0/24 r 10.2.0.2 110 to_main
Functioning of the Backup
If the link between routers OSPF_MAIN and OSPF_peer_1 goes down, we have the following
situation:
The OSPF routing changes as follows:
Routes on OSPF_MAIN router:
[admin@OSPF_MAIN] ip route> print
Flags: X - disabled, I - invalid, D - dynamic, J - rejected,
C - connect, S - static, r - rip, o - ospf, b - bgp
# DST-ADDRESS G GATEWAY DISTANCE INTERFACE
Page 120 of 695
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