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.
Next-hop : Does the router have a route to the next-hop?
Weight : This is a numeric value where bigger is better. Weight is not passed onto other peers and is a Cisco proprietary feature.
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 be recognized but they must be passed along to other BGP peers if they are present in an update.
Per the standard rules, please correct anything that’s wrong.
One of EIGRP’s big features is the ability to use unequal cost paths for load balancing. This is done with the variance command.
variance : A multiplier used to calculate which feasible successors can be used as active routes. The router takes integer and multiplies it by the successor’s feasible distance, and any FS with a an FD less than this new number gets submitted to the routing table manager.
Corrections, please. I skipped a bunch of BGP intro stuff to get to the juicy center. I’ll see if I can come back later and finish the other parts for posterity.
Study Notes
Yes. If you ask 1000 network guys the best way to influence BGP, you’ll probably get 1000 different answers.
You don’t. Weight is a Cisco-proprietary thing.