Archive
Posts Tagged ‘OSPF ABR’
Basic OSPFv2 in depth
August 27, 2012
6 comments
OSPF is one of the core topics of the CCIE R&S lab exam and therefore one should be an expert at it before attending the lab exam.
In this post I would like to explore OSPFv2 and especially how OSPF uses its algorithm to find the best path to a destination. I will try to cover most of the general OSFP topics such as basic configuration, types of LSAs, Path selection, External path selection with LSA Type 5, Default routing, Conditional Default Routing, the different types of Stub areas, Virtual-links, LSA Type 3 filtering and Prefix filtering with route-maps. I have to admit that this post is quite long 🙂
For this post I will use the following topology:
IGP: OSPF
Platform/IOS: Cisco 2691/12.4(15)T11 Adv IP services
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Categories: OSPF, Routing Protocols
CCIE, CCIE R&S, OSPF ABR, OSPF adjacency, OSPF ASBR, OSPF BDR, OSPF capability transit, OSPF conditional default routing, OSPF default routing, OSPF DR, OSPF filtering with Route-Maps, OSPF forward address, OSPF LSA, OSPF LSAs Type 3 Filtering, OSPF network types, OSPF NSSA, OSPF RID, OSPF stub areas, OSPF stub flag, OSPF timers, OSPF v2, OSPF virtual-links
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