[c-nsp] Packet Lost on interface Loopback

[Rimestad, Steinar]

Hi.

We have been hitting the same issues recently and I am sure several other people on here has as well. Per default the 76xx with untweaked CEF maximum-routes allocation is 512k prefixes for IPv4+MPLS and 256k for IPv6+MC. Seeing as the internet routing table just hit 500k prefixes you should really consider tweaking the cef maximum-routes.

Default:

PE2#show mls cef maximum-routes 
FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS         - 512k (default)
 IPv6 + IP Multicast - 256k (default)

You have to consider your MPLS+MC+IPv6 needs and re-allocate accordingly, we are currently looking to deploy around 700k+ for IPv4 routes as some of our 7600 will live on for a few more years before being replaced.

Best Regards,
Steinar

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of dol meun
Sent: 3. mai 2014 05:13
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Packet Lost on interface Loopback

Dear All,

Has anyone used to meet the problem of packet lost on interface loopback for IPv4 and IPv6 is has no problem in Cisco CISCO7606-S. CPU process is normal 5% to 10%. but we have found the logging "
%MLSCEF-SP-4-FIB_EXCEPTION_THRESHOLD: Hardware CEF entry usage is at 95% capacity for MPLS protocol." but I am not sure it related to the packet lost on the  loopback interface or not. For the ping to the other interface in that router it works fine and traffic pass-through that router also fine.

Pleas help if anyone know that root of that problem.

Best Regards,
Dol
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