- Written by Sidharth
- Posted on February 26, 2024
- Updated on February 26, 2024
- 760 Views
The EOS implementation of OSPF uses an alternate Area Border Router (ABR) behavior as specified in the IETF draft document. This is implemented as an optimization over the standard OSPF so that the packets would not be dropped when a router loses Active backbone connection which could otherwise be successfully forwarded.
- Written by Haris S M
- Posted on August 31, 2023
- Updated on September 4, 2023
- 2671 Views
Configuring OSPF as PE-CE protocol enables us to distinguish between the “real external routes” and intra network routes between the sites that are stretched across VPN. But the problem arises when VPN sites are in the same area and have a backdoor connection. With OSPF as PE-CE protocol redistribution, CE routers end up getting inter-area routes(assuming the VRFs on the PE devices that connect the CE sites, are configured with the same OSPF domain id) that actually belong to the same area and just happen to be multihomed to the backbone.