Re: BGP advertisement logic?

Hi.
Can you send BGP configuration as well as "show ip bgp' output from both
sides?

Cheers
A.

On 11/20/2011 8:48 PM, Keller Giacomarro wrote:
> While doing some of the INE Vol1 BGP labs with 'debug ip bgp *neighbor' *turned
> on, I noticed a strange behavior that I cannot explain.
>
> I am doing a hard reset between two peers. R3 is in AS200, R1 is in AS100.
> From the debug of reset on R3, what is happening is that R3 is advertising
> all of its prefixes to R1, then withdrawing all the prefixes that contain
> AS 100 in their AS_PATH.
>
> Full debug logs @ http://pastebin.com/raw.php?i=cRxBGbwm
>
> I understand the logic behind not wanting to advertise a route into an AS
> that is originated from, but doesn't R1 handle that too (DENIED due to:
> AS-PATH contains our own AS)? And R1 knows what AS R3 is in -- why is it
> sending the updates in the first place? Is there some other mechanism that
> is making R3 withdraw the routes it JUST sent?
>
> As I study for the lab, I'm trying to ensure I don't just know commands,
> but understand the guts of how the protocols work. Your insight is
> appreciated!
>
> Keller Giacomarro
> keller.g_at_gmail.com
>
>
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Received on Sun Nov 20 2011 - 21:23:19 ART