The problem is, that you want to use the routing power from the switch for internal, but have the same vlans on ISA. The only solution the I think is trunking all together and give the switch and ISA IP addresses in the client networks. Then set on every client a network route to the other vlan through switch IP and default gateway the ISA. Same on the other side.
Rupesh, Couldn't this all be simplified by not doing inter-VLAN routing on the switch and let the ISA handle everything? I can understand how the ISA failing would have a larger impact on the network that way, but I don't see how you're going to have different Web Filtering policies for the different VLANs any other way. That is, except for the manual workaround CiscoMax is talking about, but I would think it would have a higher potential for ongoing issues than the likelihood of the ISA failing. I think you might be over complicating this.
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