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EZVPN and phantom routes?

Posted on 2010-04-09
Medium Priority
Last Modified: 2012-05-09
Hello Experts-

I have an existing VPN 800 series router that is connecting to a 7600 series fine.  crypto ISAKMP reaches the QM_IDLE state.  RRI is enabled and the reverse route is being injected into the 7600.  The problem is there is an additional route on the 7600 pointing to the IP this VPN connected yesterday and I cannot clear it out.  

7600 -  sh ip route static  (my vpn network IP's are changed for security purposes)

                            [1/0] via       <<THIS IS THE VALID ROUTE

When I clear the route:      clear ip route

S /29 [1/0] via

This route will not clear out of the routing table.  After I reset the VPN session the valid route is re-inserted but the destination will not remove from the routing table.

Here is a ping to my network across the VPN

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
. ! . ! .
Success rate is 40 percent (2/5)

This is obviously due to the router attempting to load balance across the 2 static routes.

I have debugged the route:   debug ip routing static route
and the invalid route updates the same time as the valid route.  I have reviewed the configs on the local (7600) and the remote (800) routers and all is good.  

Any thoughts on how to clear the invalid route or determine where it is coming from?  I have 4 other VPN routers that are connected and operational.

Thoughts, comments, solutions?


Question by:skindt

Assisted Solution

Nothing_Changed earned 2000 total points
ID: 30210671
Does the 800 router's VPN terminate at the 7600, or in something else that is injecting the route into the 7600's route table? (looking for cure)

Can you successfully delete all routes to, and let just the good one be re-injected? (treating symptom for now)

Accepted Solution

skindt earned 0 total points
ID: 30211916
The problem was I could not clear the incorrect route.  I even cleared the entire route table.  It just kept coming back.  Since I was strapped for time, I simply had to reboot the router (7600) which cleared the phantom route and now things are running smooth again.  I wish I could have troubleshoot the issue longer since I think a reboot is a cop-out.  If I find any additional information I will be sure to post for other users.

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