I am about to delve into a topic I know little on, so forgive my ignorance. For reference purposes, I am working on this since the company I work for is being bought out and this has to be accomplished by end of day tomorrow for the merger work to happen over the weekend.
I am attempting to understand 802.1q vlans in a tagged and untagged sense. As well as how to implement it properly.
The current setup is fairly simple:
* A stack of 3 Force10 S50V switches that have two vlans, configured as follows
* A single Cisco 3925 router with only the standard 3 GigabitEthernet interfaces, configured as follows
The switches are partitioned into two vlans. Ports 1-36 are in vlan 14 while ports 37-48 are in vlan 10. Vlan 14 connects to GigabitEthernet 0/2 on the router. Vlan 10 connects to GigabitEthernet 0/0 on the router. GigabitEthernet 0/1 connects to our metro Ethernet network for inter site connectivity. DHCP is enabled on the router and services GigabitEthernet 0/2 and vlan 14.
Both vlans 10 and 14 are untagged vlans. The switches are layer 3 but are not being used to route between the vlans. Both vlans have different class C subnets. I have Shoretel phones on both vlans that require PoE and the workstations at those desks are daisy chained off the phone.
Vlan 10 must be adjusted for the merger. It will become 3 vlans. Vlans 10, 11, and 13 will be created on the same ports 37-48 for each switch. I do not have enough ports to use untagged vlans.
I have to use tagged vlans... I think. This is where I leave my map behind.
My requirements, given by the new corporate overlords, are as follows:
3 vlans numbered 10, 11, and 13; 10 for regular use, 11 for management, and 13 for WiFi. Each with its own class C address space delineated as: 10.y.71.x where y is the vlan number.
What I have figured out is:
On the switches, set ports 37-48 as untagged in vlan 10 and tagged in vlans 11 and 13.
On the router, set the following:
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.10
description RadOnc-LAN
encapsulation dot1Q 10 native
ip address 10.0.71.1 255.255.255.0
!
interface GigabitEthernet0/0.11
description RadOnc-MGMT
encapsulation dot1Q 11
ip address 10.11.71.1 255.255.255.0
!
interface GigabitEthernet0/0.13
description RadOnc-WiFi
encapsulation dot1Q 13
ip address 10.13.71.1 255.255.255.0
Is this correct? Will it work? IF it does, how can I put DHCP for each class C on the appropriate vlan? I think there is a way to have the switch act as a DHCP forwarder particular to each vlan but don't quote me on that as that is again out of my depth.