In one of my project, the 6513 with dual fwsm installed as the core with backend firewall configuration. The outside fw zone
with secu level 0 contains dhcp server and the inside users getting the IP address dynamically.When the fwsm active module is up there is no problem users are getting their ip address.Sometime the active module is down and can not session to it by "session slot 1 pro 1"
cmd. At the same time the clents are not able to get the IP add eventhough the secondary fw module is become active. Except the dhcp client issue other all services are working.
What is the issue with the active fw suddenly not accessable?. The work around is to simply reload the 6513 switch.