By Sam Halabi
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Additional info for OSPF Design
128 subnet: Serial 1 and Ethernet 0 (E0 is obviously the wrong path). This happened because RTC gave that entry to RTA via OSPF and RTA gave it back via RIP because RTA did not learn it via RIP. This example is a very small scale of loops that can occur because of an incorrect configuration. In large networks this situation gets even more aggravated. In order to fix the situation in our example, you could stop RIP from being sent on RTA’s Ethernet 0 via a passive interface. This might not be suitable in case some routers on the Ethernet are RIP only routers.
They describe the states of the router’s link to the area. These are only flooded within a particular area. 2 Network Link advertisements. Generated by Designated Routers. They describe the set of routers attached to a particular network. Flooded in the area that contains the network. 3 or 4 Summary Link advertisements. Generated by Area Border routers. They describe inter-area (between areas) routes. Type 3 describes routes to networks, also used for aggregating routes. Type 4 describes routes to ASBR.
These adjacencies are fully capable of transmitting and receiving all types of OSPF routing protocol packets. In the Loading state, link-state request packets are sent to neighbors, asking for more recent advertisements that have been discovered but not yet received. Each router builds a list of required LSAs to bring its adjaceny up to date. A Retransmission List is maintained to make sure that every LSA is acknowledged. To specify the number of seconds between link-state advertisement retransmissions for the adjacency you can use: ip ospf retransmit-interval seconds.