nanog mailing list archives
Re: honoring AS-path prepend from a peer or customer?
From: Avi Freedman <freedman () avi netaxs com>
Date: Thu, 18 Feb 1999 20:53:09 -0500
In article <99118.183518.5014 () avi netaxs com> you wrote: : If a peer (or transit customer) prepends their own AS to : their route announcements to you, do you ever strip off : the excessive As'es? That is, do you always honor them : in your announcements to your other customers (or peers)? : I do understand that any operator has full control over : deciding his own outbound policy, regardless of the : AS path. : I want to know what the industry practice is and whether : I should stipulate in my next upstream agreement that : they honor my prepends? : Thanks. Standard practice is to accept them, though you may need to tell the peer or upstream what regexps to allow if they filter by as-path as well as by prefix. (Always a good idea...) My side question is - what shipping routers will let you rewrite AS-Paths by doing anything other than just prepending? Just wondering if any 7007-type horrors are lurking in the wings. I believe Criscos, Bays, and gated boxes can't do this (without BGP->IGP->BGP redistribution). Avi
Current thread:
- honoring AS-path prepend from a peer or customer? Sanjay Dani (Feb 18)
- <Possible follow-ups>
- Re: honoring AS-path prepend from a peer or customer? Avi Freedman (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? Jared Mauch (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? Avi Freedman (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? Jared Mauch (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? I Am Not An Isp (Feb 19)
- Re: honoring AS-path prepend from a peer or customer? Jared Mauch (Feb 18)
- RE: honoring AS-path prepend from a peer or customer? Martin, Christian (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? Danny McPherson (Feb 18)
- Re: honoring AS-path prepend from a peer or customer? Danny McPherson (Feb 22)