Jaycee's Networking

August 10, 2009

Anycast DNS

Filed under: BGP, Information — Tags: — Jaycee @ 9:24 pm

DNS Anycast Service-Provision Architecture

IPv4 Anycast Routing

* Local and global nodes:

a. Anycast deployment on the Internet differs between local and global nodes:

1) Local nodes are often more intended to provide benefit for the direct local community.

2) Local node announcements are often announced with the no-export BGP community to prevent peers from announcing them to their peers (i.e. the announcement is kept in the local area).

3) Where both local and global nodes are deployed, the announcements from global nodes are often AS prepended (i.e. the AS is added a few more times) to make the path longer so that a local node announcement is preferred over a global node announcement.

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