ASBR vs ABR - Cisco Learning Network
When we want to connect a different routing protocol to an OSPF domain, say EIGRP (Exterior Interior Gateway Routing Protocol) we use an ASBR (Autonomous System Boundary Router) …
can an ABR also be an ASBR in ospf - Cisco Learning Network
R2#show ip ospf | inc ^ It is a. It is an autonomous system boundary router . R2 is still an ASBR but is no longer an ABR even though it technically borders two areas because it lacks …
ABR vs ASBR - Cisco Learning Network
An Autonomous System Boundary Router (ASBR) is a router that is running multiple protocols and serves as a gateway to routers outside the OSPF domain and those operating with …
OSPF: Multiple ASBR in AREA 0 - Cisco Learning Network
If I check R4 and R5's "routing table" and "ospf database" both routers are taking routes from R3 (ASBR) not from R2(ASBR). I have tried everything like clear ospf process on both ASBRs, or …
ASBR OSPF - Cisco Learning Network
An ASBR can summarize routes it's getting from another routing protocol. Let's take the following topology for example: R1 ---- R2 ----- R3 . R1 and R2 speak EIGRP, whereas R2 and R3 …
OSPF ASBR selection - Cisco Learning Network
Hi, When we are talking about external routes in ospf, I know E1 route is preferred over E2. But what if my router R3 is learning same prefix(4.4.4.4) from three asbr with same type-2 metric. …
OSPF Type 5 LSA filtering at ASBR - Cisco Learning Network
“OSPF does allow some route filtering, however, taking advantage of the fact that OSPF uses distance vector logic with Type 3 LSAs (and Type 5 LSAs used for external routes). Because …
Redistribution and summarization between OSPF and EIGRP
Imagine that we have an ASBR that sits between and OSPF and and EIGRP routing domain. On the EIGRP side there is a block of addresses of 172.16.0.1, 172.16.1.1, 172.16.2.1, and …
OSPF LSAs, NSSAs and external routes... - Cisco Learning Network
OK, to mirror back what I feel solid on. BR1 is an ASBR relative to the corporate network's OSPF process. It would carry the redistribute commands to inject its IGP routes into OSPF. Since the …
OSPF LSA (4/5) - Cisco Learning Network
They are flooded to all areas (except stub areas). For "External Type 1" LSAs routing decisions are made by adding the OSPF metric to get to the ASBR and the external metric from there …