[c-nsp] 1 port 2 vlans

[Cord MacLeod]

A good idea, unsure why I didn't think of that.  Thanks!

On Apr 30, 2009, at 5:17 PM, Lee wrote:

> On 4/30/09, Cord MacLeod <cordmacleod at gmail.com> wrote:
>
>> I found a CatOS way of doing this, set port auxiliaryvlan 3/1 30.
>
> I think that requires incoming traffic to have an 802.1q tag of vlan
> 30 to work..
>
>> However, I was unable to find an IOS way, does one exist?
>
> switchport voice vlan 30
> But that still requires incoming traffic to have a vlan 30 tag.
>
>> I'm attempting move machines from one subnet to another, and rather
>> than do this one at a time, 2 vlans would be ideal.
>
> Why not one vlan & two subnets?
>
> If you're starting out with, say
>
> interface vlan 20
>  ip address 192.168.20.1 255.255.255.0
>  ip helper-address 192.168.100.10
>
> change it to
>
> interface vlan 20
>  ip address 192.168.30.1 255.255.255.0
>  ip address 192.168.20.1 255.255.255.0 secondary
>  ip helper-address 192.168.100.10
>
> Fix the DHCP server to give out 192.168.30.xxx addresses, reconfigure
> the machines with static addresses to use the new subnet & when
> they're all moved over + all the old leases have expired, remove the
> secondary address.
>
> Regards,
> Lee