802.1q tagging problem

[sasj0e]

Hi,
I have Cisco 4006 switch with Sup 2 and cat IOS 7.3(2).
I have a NIC which has been configured with 802.1q vlan in a server system.This server is connected to the switch through the vlan NIC.Some 802.1q vlan id has been assigned to the vlan on NIC. For example, let me put the configuration like this...
on Switch:
Default vlan : 1
Vlan mapping dot1q vlan:1020 isl vlan :1
Port is trunking for corresponding server port:"set trunk mod/port on dot1q" is what the cli entered to enable trunking.
Now at NIC vlan:
Port is on default vlan 1 and trunking
vlan id = 1020

With the above configuration I am able to connect to the machines in vlan 1. But if I change the vlan id 1020 on NIC, then connectivity goes OR if I change Native vlan id 1 and replace it 2 or 3, the connectivity fails.
Is there any thing that could be done on switch, so that if another server with same dot1q vlan on NIC is connected to the same switch can communicate?
For example if I bring up another server with same dot1q vlan as the other server, will it be able to communicate (regardless in which native vlan it is configured).
In other words, can one dot1q vlan be mapped to many isl vlans? or 1 isl vlan to many dot1q vlans ??
Pls put some thought to resolve it...
Thanks,
Sas

 

[jgercken]

If you want to keep the same ID then you don't need a mapping statement. Simply
set trunk 2/2 on 1020 dot1q
set trunk 2/3 on 1020 isl

the switch will automatically strip the isl encapsulation and add the dot1q tag.

To set the default or native vlan simply add the port like normal
set vlan 1 2/2

Why do you want to do single to multi mapping? I think you're trying to make it too complicated. Just put everything you want to connect into a single vlan and run with it.



-Jeff ----------------------------------------
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