The following set of commands in MSFC allows VLAN traffic to Cisco ACE assuming module 4 holds the ACE.
svclc module 4 vlan-group 11
svclc vlan-group 5 21,22,23,24,25,26
Do these VLANs also need to be created on the CAT6500 switch ports. If so, is it required only for server VLANs where physical connections to the switch ports are made or also for the client VLANs (i.e. where the requests come from).
With a pair of core switches a common configuration is to connect them via a Layer 2 trunk, actually ethernet trunk, but it's the same principle.
So for each vlan you have a L3 SVI for that vlan on both switches and both switches have the vlan at Layer 2. Typically you run HSRP/GLBP on the L3 interfaces and if the active switch fails then the standby switch takes over. Active/standby here refer to the L3 SVI's. The L2 trunk allows the HSRP/GLBP packets to travserse between the 2 core switches as well as vlan traffic within the same vlan.