[c-nsp] learned routes disappear

[harbor235]

Most likely the 5 routes are not reachable. If you just added the routes via
a supernet advertisement
and they do not exist elsewhere, either locally  connected or learned via an
IGP this behavior will happen.
This is normal and the correct way for BGP to operate.

mike

On Fri, Feb 6, 2009 at 12:47 PM, Paul A <razor at meganet.net> wrote:

> Thanks Walter.
>
> I really didn't want to mess with debug as it's a production router and I
> would have to do this late night, hopefully without crashing it. I really
> was hoping someone ran into this issue before.
>
> FYI the 1st update-source is from router A to my bgp customer on fa1/43 the
> other is from router A to router B on loop0
> So I think that's fine.
>
> -----Original Message-----
> From: Walter Keen [mailto:walter.keen at RainierConnect.net]
> Sent: Friday, February 06, 2009 12:40 PM
> To: Paul A
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] learned routes disappear
>
> I would turn on debugging and see if 1:15m corresponds to one of the BGP
> nexthop scanning or other events.  Don't leave debugging on any longer
> than needed on production systems.  If you can replicate in a lab
> scenario, that would be ideal.  One thing that looks odd, is that you
> have 2 different update-source interfaces listed on RouterA's neighbor
> configuration for RouterB
>
>
> Paul A wrote:
> > Hi, I'm having a bgp issue I can't figure out and hoping someone has ran
> > into this.
> >
> >
> >
> > I have two routers, router A and router B doing bgp.
> >
> >
> >
> > Router A is advertising 5 routes to router B, when the session 1st comes
> up,
> > router B has 5 routes received from router A. After 1:15 min the learned
> > routes on router B disappear.
> >
> >
> >
> >
> >
> > Router A
> >
> > Learns the routes from one of my bgp customers.
> >
> >
> >
> > neighbor 2xx.xx.xx.xx description xxx
> >
> >  neighbor 2xx.xx.xx.xx update-source FastEthernet1/43
> >
> >  neighbor 2xx.xx.xx.xx default-originate
> >
> >  neighbor 2xx.xx.xx.xx prefix-list PxxPL-IN in
> >
> >  neighbor 2xx.xx.xx.xx route-map PLIN in
> >
> >  neighbor 2xx.xx.xx.xx filter-list 109 in
> >
> >  neighbor 2xx.xx.xx.xx filter-list 2 out
> >
> >  neighbor 2xx.xx.xx.xx remote-as xxx
> >
> >  neighbor 2xx.xx.xx.xx update-source Loopback0
> >
> >  neighbor 2xx.xx.xx.xx next-hop-self
> >
> >
> >
> > it advertises them to the configured neighbor on router A
> >
> >
> >
> > neighbor 216.xxx update-source Loopback0
> >
> >  neighbor 216.xxx next-hop-self
> >
> >  neighbor 216.xxx filter-list 1 in
> >
> >  neighbor 216.xxx filter-list 1 out
> >
> >
> >
> > If I clear the bpg session or when the session 1st comes up on router B,
> I
> > see the routes but then they disappear after 1:15 min.
> >
> >
> >
> > Thanks PA
> >
> >
> >
> > _______________________________________________
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> >
>
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