VLAN class statement

Simon Hobson dhcp1 at thehobsons.co.uk
Wed Mar 3 18:36:24 UTC 2010

Everitt, Andrew C wrote:

>We have a Cisco network that's configured to place the Cisco phones 
>into vlan 2.  When the phones send out a DHCP request the server 
>logs reflect the fact its come from vlan 2.  I would like to use the 
>fact that all phones are on vlan 2 to populate the phone (VoIP) 
>After some research I thought that option code 191 is used by the 
>DHCP server for vlan's.  So I set the following class statement up.

You don't need to do any of that - if it's in a different VLAN, then 
it's in a different network and the server will take care of things 
automagically. That's the same whether they are remote (ie the other 
side of a router), or directly attached to the server. Just define 
subnets appropriate to the networks in use and it "will just work".

Think of VLANs as like having multiple non-connected switches and 
NICs and you'll not be far wrong. In essense, VLANs simply allow the 
partitioning to be done inside the switch rather than having multiple 
separate switches.

Simon Hobson

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