[c-nsp] Changing vlan numbers

[Jeff Fitzwater]

That works but you must disable STP for those VLANS on both switches  
and disable CDP, otherwise you wil get PVST MISMATCH error and the  
vlans will not talk to each other.
I have also heard of VLAN rewriting but not sure what IOS or platform  
it is supported on.


Jeff Fitzwater
OIT Network Systems
Princeton University


On Oct 12, 2007, at 11:01 AM, Jon Lewis wrote:

> On Fri, 12 Oct 2007, Jeff Crowe wrote:
>
>> I have a catalyst 5500 with a trunk port setup doing dot1q and 3  
>> vlans
>> coming into that port (eg: 3,95,199). I need to take one of those  
>> vlans that
>> comes in (199) and change it to be vlan 48. Vlan 48 exists on the  
>> switch
>> already.
>>
>> Is there a way to re-write the vlan information so I can change  
>> vlan 199 in
>> this example to vlan 48 without having to create two access ports  
>> and put a
>> cross over between them?
>
> Do you control both ends?  If the 199 side thinks 199 is the native  
> vlan,
> and the side where you want it changed thinks 48 is the native  
> vlan, it'll
> just happen.
>
> i.e. A will send vlan199 traffic untagged.  B will receive the  
> untagged
> frames and assume they're for vlan 48.  I've never done this, but I've
> seen networks where it's happened.
>
> ----------------------------------------------------------------------
>   Jon Lewis                   |  I route
>   Senior Network Engineer     |  therefore you are
>   Atlantic Net                |
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