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Problems when configuring BGP on 4506

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gsgranados at comcast

Aug 20, 2008, 1:51 PM

Post #1 of 3 (341 views)
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Problems when configuring BGP on 4506

I'm new with the 4506 so this may be an obvious problem.

In my case I have one 4506 that I'm using the layer 3 routing option. I'm
trying to send 1 full BGP feed for now for the purposes of testing,
eventually I'll add another to make the excersize meaningful. My problem is
this, when I turn up the session after a few seconds up to a minute the
routes withdraw and when I do a show ip BGP a.b.c.d I see the route entry
and it's indicated to have no path available unaccessible. When the routes
first install they have the path available and work. In parallel, I'm
noticing a series of IP Cef Distributed errors concerning low memory. (no
bgp log messages)

So, am I seeing a limitation in the number of routes I can install? The cpu
shows 512 megs installed, is there a software limit that I'm bumping in to?

The switch is running 12.1-19 ?

Is this a hardware / memory issue or should I check in other areas? What
would make a bgp table full of routes remove once the table is downloaded?

Thank you
Scott

P.S. Sorry if this is a n00by question, the 4506 is a new switch in my lab
and google hasn't yielded me to many usable pointers yet.

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cchurc05 at harris

Aug 20, 2008, 2:22 PM

Post #2 of 3 (336 views)
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Re: Problems when configuring BGP on 4506 [In reply to]

Scott,

The Sup 6E can hold up to 256K routes, all other 4500 Sups I
think are half that or less. If you want a full table these days, the
4500 can't do it. It's not a memory limitation, it's in the hardware.
Archives have it covered in great detail.

Chuck

-----Original Message-----
From: cisco-nsp-bounces [at] puck
[mailto:cisco-nsp-bounces [at] puck] On Behalf Of Scott Granados
Sent: Wednesday, August 20, 2008 4:51 PM
To: cisco-nsp [at] puck
Subject: [c-nsp] Problems when configuring BGP on 4506

I'm new with the 4506 so this may be an obvious problem.

In my case I have one 4506 that I'm using the layer 3 routing option.
I'm
trying to send 1 full BGP feed for now for the purposes of testing,
eventually I'll add another to make the excersize meaningful. My
problem is
this, when I turn up the session after a few seconds up to a minute the
routes withdraw and when I do a show ip BGP a.b.c.d I see the route
entry
and it's indicated to have no path available unaccessible. When the
routes
first install they have the path available and work. In parallel, I'm
noticing a series of IP Cef Distributed errors concerning low memory.
(no
bgp log messages)

So, am I seeing a limitation in the number of routes I can install? The
cpu
shows 512 megs installed, is there a software limit that I'm bumping in
to?

The switch is running 12.1-19 ?

Is this a hardware / memory issue or should I check in other areas?
What
would make a bgp table full of routes remove once the table is
downloaded?

Thank you
Scott

P.S. Sorry if this is a n00by question, the 4506 is a new switch in my
lab
and google hasn't yielded me to many usable pointers yet.

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archive at http://puck.nether.net/pipermail/cisco-nsp/
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christian.macnevin at gmail

Aug 20, 2008, 2:25 PM

Post #3 of 3 (348 views)
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Re: Problems when configuring BGP on 4506 [In reply to]

From your description, I think you're saying that you're sending
routes to a receiver who isn't injecting them into the table?
Enable soft-reconfiguration inbound to check whether it's still
receiving all the routes ('neighbor a.b.c.d soft-reconfiguration
inbound') then
Check this with 'sh ip bgp <neighbor> received-routes'. Then cross
reference with 'sh ip route bgp' to see what's getting in. if you're
getting them,
check the next hop being advertised is available. If the next hops
being advertised aren't reachable, then make sure the advertising
router is
set to 'next-hop-self'.

HTH and apologies if I'm off target..

On Aug 20, 2008, at 1:51 PM, Scott Granados wrote:

> I'm new with the 4506 so this may be an obvious problem.
>
> In my case I have one 4506 that I'm using the layer 3 routing
> option. I'm trying to send 1 full BGP feed for now for the purposes
> of testing, eventually I'll add another to make the excersize
> meaningful. My problem is this, when I turn up the session after a
> few seconds up to a minute the routes withdraw and when I do a show
> ip BGP a.b.c.d I see the route entry and it's indicated to have no
> path available unaccessible. When the routes first install they
> have the path available and work. In parallel, I'm noticing a
> series of IP Cef Distributed errors concerning low memory. (no bgp
> log messages)
>
> So, am I seeing a limitation in the number of routes I can install?
> The cpu shows 512 megs installed, isere a software limit that I'm
> bumping in to?
>
> The switch is running 12.1-19 ?
>
> Is this a hardware / memory issue or should I check in other areas?
> What would make a bgp table full of routes remove once the table is
> downloaded?
>
> Thank you
> Scott
>
> P.S. Sorry if this is a n00by question, the 4506 is a new switch in
> my lab and google hasn't yielded me to many usable pointers yet.
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/

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