BGP RIB Out AS Path

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Announcements

BGP RIB Out AS Path

L2 Linker

I am using BGP between two ISP's. On one of them my AS number is listed one time by each prefix. On the other ISP my AS number is listed 6 times by each prefix. The ISP with 6 AS numbers is a lower preference.

 

Anyone know why?

2 REPLIES 2

Hi @GFN182 ,

 

If I understand you correctly, I believe you are talking about "AS path prepending". This is commond technique used to design which path will be primary and which backup. If you recall from BGP path selection, route with shortest AS path will be prefer. In addition AS path is one of the first critieria which device will use to compare paths to same destination.

 

AS path prepend will copy the last AS from the path and append it n-times.

It was a setting under one of our Export rules.

  • 1902 Views
  • 2 replies
  • 0 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!