[c-nsp] Filtered BGP routes

[Peter Nyamukusa]

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Daniel Faubel
> Sent: 14 December 2007 10:52 PM
> To: Peter Rathlev; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Filtered BGP routes
> 
> 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?

You could try to do debug ip bgp events/updates

> 
> 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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