What's the point of prepend communities?
Jason Lixfeld
jason+nanog at lixfeld.ca
Thu Oct 26 18:47:44 UTC 2017
Hi Bill,
> On Oct 26, 2017, at 2:37 PM, William Herrin <bill at herrin.us> wrote:
>
> BGP routing is based on "distance". Distance in BGP is primarily calculated as the number of ASNs in the AS Path. Prepends make a path more distance, encouraging routers to choose a different path if one is available.
I understand how prepends fit in the context of best path selection, but my question was more the difference between a customer signalling the ISP to prepend their AS using a BGP community stamped to a prefix vs. the customer prepending their own AS instead.
More information about the NANOG
mailing list