we're having problems with Microsoft NLB causing high cpu usage (peaks of 95%) on catalyst 4500s (IOS Version 12.2(31)SGA1, RELEASE SOFTWARE (fc3)). please see attached powerpoint slide for network diagram and configs (ip addresses aren't the real ones).
the 2003 servers are configured for IGMP multicast.
i've followed the http://www.cisco.com/warp/public/473/cat4500_high_cpu.pdf document to troubleshoot.
â¢ K2CpuMan Review was taking the most cpu
â¢ CPU queue L3 Fwd Low was getting a high volume of traffic so the document recommended a cpu monitor session
CPU monitor session showed:
â¢ High volume of traffic between NLB server (126.96.36.199) and proxy (188.8.131.52)
â¢ High volume of Client (both external/internal) traffic to proxy
switchport block multicast
switchport block unicast
on VLAN 222 but this made no difference to 4500 cpu
enabling cgmp on vlan 222 on 6500 but it's cpu jumped to 99% (from 1%) - the 4500s also went to 99% - cgmp switched off on 6500 vlan 222
the traffic we're seeing in the capture isn't unexpected but what can we do stop the high cpu on the 4500s.