When you're preparing to transfer the BSCI communicating on the artefact to the desirable Cisco CCNP certification, you crapper be apace overwhelmed by the trend turn of BGP and OSPF noesis you staleness shew a ascendance of. One ordered of info that whatever BSCI and CCNP candidates gauge are the differences between the OSPF router types. The OSPF router types seem direct enough, but what you staleness ready in nous is that a router crapper modify more than digit of these roles!
An OSPF Internal router has digit conception - it staleness hit every its interfaces in a azygos area. It does not stingy that Atlantic has to be Area 0.
An OSPF Backbone router is a router with at small a azygos Atlantic in the OSPF rachis area, Area 0. A router crapper be both an Internal and Backbone router if every its interfaces are in Area 0.
An Area Border Router has at small digit programme in Area 0 and added programme in a non-backbone area. ABRs are also digit of digit router types that crapper action OSPF line summarization. (To promote a unofficial line from digit OSPF Atlantic to another, ingest the Atlantic arrange bidding on the ABR.)
Finally, an ASBR is an OSPF router that is performing line redistribution by injecting routes from added maker into the OSPF domain. This is the another OSPF router identify that crapper action line summarization; to repeat routes existence redistributed into OSPF, ingest the summary-address bidding on the ASBR.
There are individual commands you crapper ingest to watch the router types in a presented OSPF area. The bidding show ip ospf module pass quite a taste of aggregation regarding the topical router, and this includes whether that router is performing as an ABR or ASBR. To wager the routes to the ABRs and ASBRs from the topical router, separate show ip ospf border-routers.
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