BGP Path Attributes
Lesson 1: BGP Path Selection
BGP Path Attributes define facts about a particular route or path through a network. Each PA defines something different about the path, so to truly understand BGP PAs, you need to examine each PA. This section begins by reviewing a few PAs that should now be familiar, and then this section introduces a few new PAs.
BGP uses the Autonomous System Path (AS_Path) PA for several purposes. This particular PA lists the ASNs in the end-to-end path. BGP uses the AS_Path PA as its primary loop-prevention tool. Specifically, when an eBGP peer receives an Update, if its own ASN is already in the received AS_Path, ...
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