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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

EIGRP Notes - Authentication

Corrections – I invite them. 1. Create the keys in the keychain. R101(config)#key chain KEYCHAIN R101(config-keychain)#key 1 R101(config-keychain-key)#key-str R101(config-keychain-key)#key-string MYKEY 2. Enable authentication on an interface. R101(config-if)#ip authentication mode eigrp 1 md5 3. Associate keychain with EIGRP. ip authentication key-chain eigrp

OSPF Notes - Authentication

Corrections appreciated. Type 0 : No authentication. This is the default type. R0(config-if)#ip ospf authentication null ----- R0(config-router)#area 1 virtual-link 2.2.2.2 authentication null Type 1 : Clear text authentication ----- R0(config-if)#ip ospf authentication - or - R0(config-router)#area 1 authentication R0(config-if)

BGP Notes - Path Decision

This is required blogging…and reading for that matter. A good chunk of this is taken from my CCNP posts from last year. Corrections, please. —– How does a BGP router decide which BGP route is the best? Next-hop : Does the router have a route to the next-hop? Weight : This is

BGP Notes - Path Attribute Categories

Make my corrections! Please! Well-known mandatory : These PAs must be recognized by all BGP routers and passed along to other peers. Well-known discretionary : These PAs do not need to be in every update, but they must be recognized by all BGP routers. Optional transitive : These PAs don’t have to