Lowen is right, you can actually map all of your VLANs to the module with a single group. Then inside the system context you decide which VLANs map to which contexts.
In answer to your question lowen, yes you can map multiple groups to one module. I acutally do that sometimes, even though there isn't a practical reason to do so.
I don't understand the question. If you're talking about firewall vlan-groups on the switch/router, you only need 1 vlan-group for each fwsm (or failover pair), regardless of the number of contexts. Can you actually assign multiple firewall vlan-groups to a module?
If you're talking about the vlans in a firewall vlan-group, where does this information about the restriction come from? You could have 16 vlans for a single transparent context (with 8 bvi's), which would imply you could have 320 vlans w/20 contexts. I've never seen anything about a restriction related to vlan-groups.
Lowen is right, you can actually map all of your VLANs to the module with a single group. Then inside the system context you decide which VLANs map to which contexts.
In answer to your question lowen, yes you can map multiple groups to one module. I acutally do that sometimes, even though there isn't a practical reason to do so.
