BGP prefix with 0 in its as-path

thinkmano · 05-14-2009, 01:28 AM

Hi All,

I am having a doubt in BGP behavior, when a peer advertises prefix with 0 in its as-path.

For example:

Prefix : 1.1.1.1
as-path : 1 2 0 3 4

When I googled, AS 0 is reserved and it is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.

I am not able to find what should be the behavior when DUT receives prefix with AS 0 in its as-path. Is there any RFC/Draft which tells what should be the behavior?

Thanks.

Prometheus_Fire · 07-05-2009, 04:39 AM

Hi thinkmano,

Out of curiosity, as 0 is reserved, never advertised and would not be accepted by BGP; why would you want to waste time figuring out something that wouldn't happen?

Anyway, here's the RFCs you will find useful: http://www.bgp4.as/rfc. Happy reading! ;-)

Regards,

Pro

05-14-2009, 01:28 AM	#1 (permalink)
thinkmano Registered User Join Date: May 2009 Posts: 1 OS: routing protocol	BGP prefix with 0 in its as-path Hi All, I am having a doubt in BGP behavior, when a peer advertises prefix with 0 in its as-path. For example: Prefix : 1.1.1.1 as-path : 1 2 0 3 4 When I googled, AS 0 is reserved and it is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS. I am not able to find what should be the behavior when DUT receives prefix with AS 0 in its as-path. Is there any RFC/Draft which tells what should be the behavior? Thanks.

07-05-2009, 04:39 AM	#2 (permalink)
Prometheus_Fire Registered User Join Date: Jan 2007 Posts: 134 OS: Win2K, WinXP, Win Vista, Win2K3, Win2K8, IOS	Re: BGP prefix with 0 in its as-path Hi thinkmano, Out of curiosity, as 0 is reserved, never advertised and would not be accepted by BGP; why would you want to waste time figuring out something that wouldn't happen? Anyway, here's the RFCs you will find useful: http://www.bgp4.as/rfc. Happy reading! ;-) Regards, Pro __________________ Scintillate, scintillate, asteroid minific; Feign do I fathom your nature's specific Exaltedly set on the aether capacious A reasonable facsimile of a gem carbonaceous.