Are you running WCCP w/GRE Return in your environment? We just tried to go from 4.1.1c to 4.1.3 Sunday evening, and had significant problems. The remote WAE's went offline to the CM, and no TCP connections between sites were working. Based on our previous experience with WAAS updates, we were expecting a no-hassle update so we didn't allow a lot of time for troubleshooting and ended up reverting back to 4.1.1c.
Directed Mode with GRE return may cause high cpu utilization on routers
Data transfer on optimized connections may slow down due to high CPU utilization on the Catalyst switch.
When Directed Mode feature is configured on an edge or a core WAE and edge WAE is configured with wccp any non-encapsulating egress methods (L2 / IP) whereas core WAE is configured with wccp GRE or GGRE return method. Only WAAS 4.1.x software is affected by this problem.
Configure wccp GRE or GGRE return method on the edge WAE or reduce tcp mss size by configuring 'tfo tcp optimized-mss 1432' command on the edge WAE.
Further Problem Description:
Verify for packet fragmentation that may be causing high cpu utilization by executing 'show stats wccp gre' command if the wccp return egress method is GRE or 'show stats generic-gre' for GGRE method
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