Carl Zellers asked an excellent question on how EIGRP works when run over FlexVPN with IP unnumbered, considering that routers will not be on a common subnet. I thought this was a great question so I took some help from
EIGRP Network Design
Introduction Enhanced Interior Gateway Routing Protocol (EIGRP) is a routing protocol developed by Cisco based on the DUAL algorithm. EIGRP was previously proprietary but has recently been opened up by Cisco with an IETF draft. EIGRP has been accused of
EIGRP named configuration
You might think that EIGRP being around for so long is not getting any attention from Cisco, not true. EIGRP is still being developed and in later releases you can run what is called named configuration. Doing this you can
EIGRP draft released
Donnie Savage, Russ White, Don Slice, J. NG and Steven Moore all from Cisco have published the IETF draft for EIGRP. You can find it here. Why would you want to read this draft? If you are a CCIE candidate
Route redistribution – Route-maps and tagging
Earlier I have done some posts on route redistribution and on route filtering in different protocols. I wanted to expand on this by showing different ways we can tag and do filtering with route-maps when doing route redistribution. We start
Filtering routes in EIGRP
EIGRP is often called a hybrid because it has some similar features to link state protocols and also has distance vector features but the truth is that it is a distance vector protocol. Even though it is distance vector it
EIGRP on secondary interfaces – quiz
When we configure EIGRP on interfaces that are not on the same subnet we will get a message from EIGRP telling us this. What happens if we configure EIGRP on secondary interfaces? Try this setup with two routers: R1: Primary
Enhanced Interior Gateway Protocol (EIGRP) – notes
Cisco proprietary Uses IP protocol 88 as transport Support for MD5 authentication (no clear text) Sends updates to 224.0.0.10 Distance vector but has some link state like features Timers Uses a hello and a hold timer. Neighbors discovered via hello