Access1 (Servers, Internet) / \\ / \\ L2trunk_A / \\ L2trunk_D / \\ / \\ / \\ / \\
Dist1-----------------Dist2 (L2trunk) \\ / \\ / \\ / L2trunk_B \\ / L2trunk_C \\ / \\ / \\ / Access2 (Clients) / / L2 trunk / AP1
THE PROBLEM:
The way we are planning to be setup - add Dist2 and run HSRP for both Vlan1 and Vlan2. Dist1 will have higher priority in both HSRP and STP for VLAN1. Dist2, higher priority for HSRP and STP for VLAN2. Both Dist1 and Dist2 perform InterVlan Routing.
All servers and Internet devices are on Vlan1 (currently flat network).
Looking at the traffic pattern (client to server) according to this plan, a client on VLAN2 wired to Access2, will hit Dist2 cross Vlans to Vlan 1, then cross to Dist1 (since L2trunk_D will be effectively blocked by STP for VLAN1) and using L2trunk_A will get to the server.
The return path: From the Server wired to Access1, through L2trunk_A to Dist1, cross VLANs to VLAN2 (L2trunk_B blocked for VLAN2), get to Dist2 and down to Access2.
Obviosly not the most efficient way to switch/route traffic.
The HA Campus Design paper on Cisco's web site doesn't seem applicable here, because of the Access Points (spread all over campus) running multiple SSIDs on multiple VLANs, hence L2 trunking needed!
I'd appreciate any input from you!