BGP - EBGP SESSIONS

In this video we will explore eBGP sessions, the controls that the protocols implements for session establishment, TTL considerations and Next-Hop management.

Loading video...

NOTE: You can only see a limited low resolution version of the video, if you want to view the full version please sign up and get any of our plans!

Video Description

The sessions established between two routers in different autonomous systems are considered as External BGP (eBGP) 

The NLRI announcements of other ASes usually contains the next-hop of the external neighbor router. This can be an issue for the iBGP sessions within our AS. 

The next-hop is not modified when NLRIs are announced to a iBGP peer
It's common for the eBGP sessions to be established using the address of the physical interfaces that connect the routers. (RFC Compatible)

TTL-Security is an additional protection that we can implement to prevent certain attacks against the control plane. With it, we can discard attempts to start a session with a TTL < 255 - [CONF VALUE].

When a prefix is announced between eBGP peers, the AS-PATH attribute is altered to include the announcer AS. 

Rating

Global

Watch video in playlist

comments powered by Disqus