nanog mailing list archives
Re: What's the point of prepend communities?
From: Brett Frankenberger <rbf+nanog () panix com>
Date: Sun, 29 Oct 2017 08:26:10 -0500
On Sun, Oct 29, 2017 at 07:01:13AM -0500, Mike Hammett wrote:
If I understand the OP correctly, I will use this real world example: https://onestep.net/communities/as174/ 174:3001 through 174:3003 as compared to doing the prepending yourself. What is the functional difference? BGP neighbors of 174 will see just as many AS hops either way, but non-BGP customers of 174 would see you just one hop away. It's just another method of traffic engineering.
According to the link you provided, 3001..3003 are effective on "ALL peer[s]" (which is differnet from all BGP neighbors). So BGP-speaking customers of 174 will not see the prepending if you use 174:3001..3003, but peers will; but if you do the prepending yourself, then all 174's peers and all 174's BGP-speaking customers see it. -- Brett
Current thread:
- Re: What's the point of prepend communities?, (continued)
- Re: What's the point of prepend communities? William Herrin (Oct 26)
- RE: What's the point of prepend communities? Naslund, Steve (Oct 26)
- Re: What's the point of prepend communities? Brett Frankenberger (Oct 26)
- Re: What's the point of prepend communities? Steve Dodd (Oct 28)
- Re: What's the point of prepend communities? Leo Bicknell (Oct 26)
- Re: What's the point of prepend communities? Clinton Work (Oct 26)
- RE: What's the point of prepend communities? Naslund, Steve (Oct 26)
- Re: What's the point of prepend communities? Leo Bicknell (Oct 30)
- Re: What's the point of prepend communities? Michael Hallgren (Oct 30)
- Re: What's the point of prepend communities? Mike Hammett (Oct 29)
- Re: What's the point of prepend communities? Brett Frankenberger (Oct 29)