[c-nsp] Filtered BGP routes

[Daniel Faubel]

Maybe I am asking the question in the wrong way.

In a Foundry router when I type in this:
sh ip bgp neighbors IP_ADDRESS received-routes


I get this very near the top:
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
       E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED
F:FILTERED


Filtered being what I have filtered based off of prefix or as-path
lists.


On the Cisco I type in this:
sh ip bgp neighbors IP_ADDRESS received-routes

And get this near the top:
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete



I understand how to view the routes I am getting from the peer. How do I
view the filtered/blocked/denied routes?

Thanks again for your help,
Daniel Faubel


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Friday, December 14, 2007 12:04 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Filtered BGP routes

On Fri, 2007-12-14 at 10:55 -0800, Daniel Faubel wrote:
> I have a very quick question for you guys. I have prefix and filter
>  lists on my BGP peers. Using Foundry gear I am able to very quickly
>  see what routes I am not accepting from my peers by typing in:
> 
> "sh ip bgp neighbors IP_ADDRESS received-routes | inc EF"
> 
> How is this done using Cisco gear?

As Robert writes, you can do it with the completely similar command:
"show ip bgp neighbors IP_ADDRESS received-routes". Just remember that
you have to enable inbound soft reconfiguration ("neighbor IP_ADDRESS
soft-reconfiguration inbound"). Beware that this makes your router store
a copy of all the prefixes received from this neighbor, and that may use
a lot of memory.

Regards,
Peter Rathlev


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