Wednesday, November 5, 2008

Double Traceroute In MPLS

If you are getting double traceroutes in MPLS cloud then definately you are running with cisco bug CSCef16357. From one of the thread Click Here I come to know about that bug.

Cisco has clearly mentioned that this is the hardware issue of sup720 in 6500 chassis.

CSCef16357 Bug Details

MPLS/SUP720 : egress CE appears twice in traceroute

In a MPLS/VPN environment, egress CE is seen twice in traceroute.

This problem is seen if both following conditions are met :
- egress PE is a cat6k with sup720
- MPLS core is hidden (no tag-switching ip propagate-ttl
is configured on
ingress PE)

N.B. Same problem is seen in a simple MPLS environment (without VPN)


Further Problem Description
This is an hardware problem and cannot be fixed by software.
It impacts all software versions

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