I seem to recall that one of the CSS should have an - ip redundancy master command. Could that be the reason why I am getting duplicate IP address messages on both CSS units - sometimes every 5 or 10 minutes and sometimes about 3 or 4 times a day. The keepalives are somehow getting lost. There are two CAT 4000 switches interconnecting the CSS on VLAN 21 which also report Host Flapping Messages for VRRP MAC address - which is probably the effect rather than the cause of the problem.
Does the config look OK.
I aksed the customer to make interface 1/2 just an access port - since it is only carrying one VLAN there is no need to make it a trunk port and make the adjacent CAT 4500 swith ports also access ports - and asked her to do this on both CSS and both CAT 4500 switches. She said when she did that she lost connectivity to the serverfarms. She immediately restored to roginal config without more troubleshooting.
SHOW TECH of both CSS units attached.
