By William Parkhurst
This is the step by step consultant to configuring, designing, and imposing a community utilizing OSPF (Open Shortest course First), Cisco's preferred routing protocol. It covers the newest model, OSPF 2, and likewise discusses the protocols's constraints. an important reference for all Cisco community engineers and technicians--especially these learning for the notoriously tough CCIE examination, which calls for complete wisdom of OSPF to move.
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Extra info for Cisco Router OSPF: Design & Implementaton Guide
RTA is not running OSPF. RTB is redistributing BGP routes into OSPF. According to OSPF, RTB is an ASBR advertising external routes. 0) RTB. This makes sense because there is no need to make the extra hop. An important thing to remember is that routers inside the OSPF domain should be able to reach the forwarding address via OSPF in order for the external routes to be put in the IP routing table. If the forwarding address is reached via some other protocol or not accessible, the external entries would be in the database but not in the IP routing table.
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. 5 AS external link advertisements. Originated by ASBR.
This might not be suitable in case some routers on the Ethernet are RIP only routers. In this case, you could allow RTC to send RIP on the Ethernet; this way RTA will not send it back on the wire because of split horizon (this might not work on NBMA media if split horizon is off). Split horizon does not OSPF DESIGN GUIDE-NSA group April 25, 1996 42 allow updates to be sent back on the same interface they were learned from (via the same protocol). Another good method is to apply distributelists on RTA to deny subnets learned via OSPF from being put back into RIP on the Ethernet.