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Redistribution Notes - AD Manipulation

* Manipulating administrative distance (AD) is another way to help with a mutual redistribution scenario. * EIGRPs has different ADs for internal and external (redistributed) routes * OSPF and RIP have the same AD no matter where the route orginated. * This means that routes redistributed into OSPF may be used instead of a

Redistribution Notes - Tagging

* Tagging provides a way to mark common or similar routes to manipulate later. * In redistribution scenarios with mutual redistribution on two different routers, any routes that gets redistributed from one route process to another are tagged. * When the other router sees those tags on the route, that route to keep

CCIE R&S Written Materials

I’m scheduled to take the CCIE R&S Written exam on 10 July at Cisco Live, and I’ve been asked by a handful of people on Twitter exactly what materials I’m using. I figured it would be a good idea to let everyone know so that

BGP Notes - Synchronization

* With synchronization on, route must be synchronized to an IGP in order for that routes to be able to be voted ‘best” by BGP. * That means the exact route must already be in the routing table via an IGP. * Static routes don’t count. * This is traditionally accomplished by redistributing

BGP Notes - Route Reflectors

* Route reflectors remove the requirement of having a full mesh iBGP network. * Any iBGP route a router reflector learns is sent to all route reflector clients. * Non-client iBGP neighbors do not get the new route per iBGP rules. * RR clients are configured like normal iBGP routers. * All RR client config

BGP Notes - Confederations

* RFC 3065 * BGP confederations reduce the size of full mesh iBGP ASes by dividing it up into different areas. * Confederations also remove the need for BGP synchronization since all iBGP routers will have all routes. * In effect, your iBGP AS gets chopped up into different sub-ASes. * Each router is a

BGP Notes - Authentication

Corrections welcome. It’s simple as pie to enable MD5 auth to a BGP peer. R102(config-router)#neigh 192.0.2.101 pass MYKEY