ICMP spikes every 50 pings

[mbellears2]

I've got a strange situation were every 50 pings, the response times jump to 300-400m/sec for 2-3 pings, then return to normal.

We have a 7206, running at ~10% CPU Utilisation, with ~140Mb RAM free performing 802.1q

The ping fluctuations occur when I ping local servers, client DSL connections and also external addresses.

Testing 5 different connections simultaneously (3 DSL, one local Server, and one external Internet address) reveals the fluctuation occurs at exactly the same time on all connections.

ip-directed broadcasts are disabled on every interface.

Any assistance is greatly appreciated.

Regards,

MB

[lincolnp1]

It appears you may have some sort of rate limiting configured ...

Lincoln

[mbellears2]

Thanks for the reply - but I have found the cause of the issue:

We had recently started accepting the full BGP routing table from one of our upstreams.

BGP scanner was causing high-cpu once a minute.

Enabling cef appears to have fixed the issue.

Regards,

MB