Unable to see Nexus is a hop when traceroute

Unanswered Question
Dec 31st, 2009


I have nexus 7010 running ospf. When I traceroute from one of the  far remote sites (6hops away) I cant see the nexus as a hop. Where as  from another site which is 5 hops away I can see it.

Anybody have any idea why i cant see it. Is there anything to be done in COPP.

Thanks & regards


I have this problem too.
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francisco_1 Thu, 12/31/2009 - 04:05

I beleieve when you bring up your NX-OS device for the first time, the NX-OS software installs the default copp-system-policy policy to protect the supervisor module from DoS attacks which blocks traceroute. I think you have to modify the CoPP policy to allow traceroute.

see http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_1/nx-os/security/configuration/guide/sec_cppolicing.html

sachidananda panda Sat, 01/02/2010 - 12:39


Thanks for your reply. But the problem is the traceroute shows when it is only 3-4 hops. As soon as the no. of hops increases it crosses the nexus without showing it(only shows * * * *). This looks strange to me.




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