#JNCIP-ENT: BGP, TCP MSS, and MTU Discovery

July 1, 2013

Came across this one while studying for the JNCIP-ENT.

http://www.juniper.net/techpubs/en_US/junos12.1/topics/usage-guidelines/routing-configuring-mtu-discovery-for-bgp-sessions.html

Quick Summary:

mtu-discovery is disabled by default
TCP MSS for non-direct peerings: 512-byte
thus convergence can be improved by enabling mtu-discovery