Aaron's Worthless Words

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Stuff about BGP

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

BGP Notes - Neighbor States

Corrections appreciated. Idle : There is no relationship, but the router sends out a TCP SYN to the neighbor to get the ball rolling. Idle (admin) : The neighbor is admined down. Connect : The router is waiting for the TCP connection to finish. If the TCP connection finishes, the router sends an

BGP Notes - Message Types

Corrigeme, por favor. Open : When a neighbor is configured, the router sends an open to that neighbor to get the ball rolling. Destination: The neighbor's configured IP Important fields: My AS Update : The routing information Destination: The neighbor's configured IP Important fields: Advertised network Klonopin Online

Routing IPv6 with BGP - The Basics

Are you sensing a theme lately? Since we covered the basics of the main IGPs (I'm an enterprise guy, so no IS-IS comments, please.), I thought I'd try to describe the basics of advertising IPv6 routes over BGP. Yet again, we're not going to

Tagging External Routes in EIGRP

EIGRP allows you to tag external routes. That is, any route redistributed into EIGRP can be tagged with a numeric descriptor from 0 to 4294967295. These tags are carried throughout the EIGRP AS, so, with some planning and documentation, you can look at any route on any router and get

ROUTE Notes - Further IGP Redistribution

As always, corrections are requested. Study Questions * I’ve got IGRP and EIGRP both configured with the same AS number. What’s special about this configuration? If both use the same AS number, then they automatically redistribute their routes into each other without using the redistribute command. * When redistributing one