[c-nsp] Loop/Unreachable problem with C6500/SUP720

Juergen Marenda jm at ilk.net
Wed Aug 8 15:28:11 EDT 2012

(proxy-) ARP on wrong Interface / vlan ?
You have random /32 more specific host-routes,
compare mac-address table and arp-cache
for the current wrong routed ip.

Or are the ip's those found as ospf router-id ?

Hope this help's,


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tim Densmore
> Sent: Wednesday, August 08, 2012 8:04 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Loop/Unreachable problem with C6500/SUP720
> On 8/8/2012 10:29 AM, Xu Hu wrote:
> > If yes, it is a normal behaviour.
> Hi,
> Can you explain in what circumstance this would be normal?  
> has an AD of 110 and iBGP 200, so even if the routes weren't 
> known via 
> connected, how would they randomly compete for space in the FIB?  I 
> don't have OSPF or BGP running on any SVIs, so this is an honest 
> question, not snarkiness, since I may find myself in this scenario in 
> the not too distant future, albeit on 7600s rather than 
> 6500s.  Pointers 
> to docs would be great.
> Thanks,
> TD
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