Eigrp To Bgp Redistribution Timers

1. Cisco Eigrp Redistribution

What motivated me to write this post is a state of the IP routing of some of the enterprise networks I’ve seen.A quick show ip route command reveals a non-disentanglable mixture of dynamic and static route with multiple points of redistribution and complex,rigid filtering rules, something you’d only see in your bad dream or a CCIE-level lab. It certainly takesa good engineer to understand how it works and even that can take up to several hours. I think the reason for thatis that people have generally been concentrated on learning about the routing protocol, how it works, all the knobs you can twistto influence a routing decision logic. However, one thing often overlooked is the routing protocols best practice design,i.e. When and how to use a particular protocol.And since the latter is often an acquired skill, a lot of not-so-lucky engineers end up with wrong ideas and conceptsin the heads.

So we should redistribute BGP into EIGRP on R4 and make sure R5's loopback can reach PE1's prefixes, which just happens to be the next task to complete. R4(config)#router eigrp 200 R4(config-router)#redistribute bgp 200 metric 1 1 1 1 1. Dec 28, 2011 - Thank You For Your Time And Best Of Luck! Thus, If RIP Is Being Redistributed Into EIGRP, The Routing Table Must Have An Entry For The.

Below I’ll try to list what I consider a best practice design of today’s enterprise networks.OSPF, EIGRP, BGP? Which one to use?Golden rule is to always use a protocol where it was designed to be used. Use and constrain IGP to a single autonomous system.For enterprise networks autonomous system can be:. a single, geographically-constrained office network. remote branch office network. campus network.

Cisco Eigrp Redistribution

data centreUse BGP to interconnect these systems. When there’s a choice to use iBGP vs eBGP, always prefer eBGP since it has less restrictions.However for some designs iBGP is a better fit (i.e. Hub-and-Spoke topologies). Almost for every WAN technology there’s a preferredWAN protocol, e.g. EBGP for L3VPN, iBGP for DMVPN/FlexVPN, so always check with the vendor’s design guide. IGP best practicesThe choice of a particular IGP is mainly irrelevant.

EIGRP scales better in a well-structured hierarchical network, whereas link-state protocol like OSPFdon’t require any underlying structure. In fact, best practice for OSPF design, for quite some time, has been to put all routers in a single Area 0 regardlessof their geographical location. This rule, like any, has its’ exceptions and special dampening/ advertisement containment rules need to be appliedto links prone to flapping (e.g. Aerial links).

However, both EIGRP and OSPF have proven to be quite stable and scalable even with not-so-good designs.I follow the these rules when designing an IGP:. Advertise all routers’ networks, i.e.