Consider the routing table on R1 router:
esr# show ip route
C * 10.0.0.0/24 [0/0] dev gi1/0/12, [direct 00:49:34]
O * 10.0.1.0/24 [150/20] via 10.0.0.1 on gi1/0/12, [ospf1 00:49:53] (0.0.0.3)
O * 192.168.20.0/24 [150/30] via 10.0.0.1 on gi1/0/12, [ospf1 00:50:15] (0.0.0.3)
C * 192.168.10.0/24 [0/0] dev lo1, [direct 21:32:01]
Review the routing table on R3 router:
esr# show ip route
O * 10.0.0.0/24 [150/20] via 10.0.1.1 on gi1/0/12, [ospf1 14:38:35] (0.0.0.2)
C * 10.0.1.0/24 [0/0] dev gi1/0/12, [direct 14:35:34]
C * 192.168.20.0/24 [0/0] dev lo1, [direct 14:32:58]
O * 192.168.10.0/24 [150/30] via 10.0.1.1 on gi1/0/12, [ospf1 14:39:54] (0.0.0.1)
Since OSPF considers virtual link as the part of the area, R1 routes received from R3 are marked as an
intrazone and vice versa.
To view the neighbors, use the following command:
esr# show ip ospf neighbors 10
To view OSPF routing table, use the following command:
11.5 BGP configuration
BGP protocol is designed to exchange subnet reachability information among autonomous systems (AS), i.e.
router groups united under a single technical control that uses interdomain routing protocol for defining packet
delivery routes to other AS. Transmitted information includes a list of AS that are accessible through this
system. Selection of the optimal routes is based on effective rules for the network.
In the firewall, you should enable OSPF protocol (89).
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