When you are ready to test the BSCI towards the coveted Cisco CCNP certification, to incorporate, you can quickly due to the sheer amount of BGP and OSPF knowledge you must demonstrate mastery will be overwhelmed. A number of details that some candidates to underestimate CCNP BSCI and the differences between the types of OSPF routers.
An OSPF router as a rule – it must have all its interfaces in a single area. It does not mean that the area to area must be 0.
An OSPF backbone router is a router with at least one unique area in the dorsal area OSPF-Range 0 A router can be both internal and backbone routers, if all its interfaces in the range 0.
An area border router has at least one interface in Area 0 and another interface in a non-backbone. ABR is also one of the two types of routers that can perform OSPF route summarization. (For a summary of a route OSPF area to another, use the wide range of SLA.)
Finally, a an ASBR router, the redistribution of OSPF route from the scene by the injection route from another source in OSPF. This is another OSPF router type that can perform a short road to routes redistributed into OSPF are combined, use the short address on the ASBR.
There are several commands that you use in order to determine the types of routers in a given area OSPF. The command “show ip OSPF” shows a little information about the local router, and that includes when the router as the ABR or ASBR operates. To see the roads to ABR and ASBR local router, run “show ip OSPF border router”.