cisco 3620 router not responding to ping

[tian-lu]

our gateway x.y.z.1 is on a cisco 3620 router. In my system log, the message like the below happens several time a day for the last couple of weeks:

15-4-2002 10:23:58 WARNING NextHopRouter x.y.z.1 Is Not Responding to Ping

15-4-2002 10:24:05 INFO NextHopRouter x.y.z.1 up

The interval between not responding to up is about 4-20 seconds. It happens during the day, and at midnight as well. Cables have been changed, but not help.

Could any one gives hints how to troubleshooting this problem?

Tanks.

[Gilles Dufour]

enable logging buffer on the router and check the router logs to see if any error

is reported.

do some 'sh inter ' and see if you have any drops.

Monitor the CPU, to see if during the non-response time you have a high cpu.

Make sure you run a recent software version.