Vlan stretching?

[Luisantia]

I have 5 sites connected by Our Own 20G fiber(2-3 miles apart)

1. What is the best way to stretch my server vlan 10 across the sites

2. Since i have a 20 G fiber can i just treat the sites as a "LAN" and trunk vlans? 

Define Vlans in all the cores ?  that way i can just move anything between sites 

Vlan 2 192.168.1.1

Vlan 3 192.168.2.1  "Site 1

....._> Vlan 15 15.1

Vlan 16 16.1

Vlan 17 17.1  "Site 2"

Vlan 18 18.1

[Francesco Molino]

Hi

What type of devices do you have on each site?

The simplest way is to do trunk between all sites.
However, just to be sure, on your design we see same vlans 1-12 on all sites but IP addresses are different. What do you want to achieve? Each site has its own subnets + some shared subnets? It's just a clarification.

[Luisantia]

I have 3750 cores in all sites, the current design has different subnets in each site "switchport access", i am wondering if i rearrange the vlans to make it the same subnets in all sites that way i can have "site specific" subnets + share the other site vlans. i will have 60 vlans instead of 12 

the main Goal is to be able to move servers back and forth 

[Francesco Molino]

Ok understood. Then you can specific vlans spanned across your sites for server use only and you can add one to make a dynamic routing between your sites to keep L3.

[Luisantia]

Any recommendation on how to do this ? 

The Cores are currently connected trough fiber(20G) using port channel " switchport access vlan x"

question #1 is that the best way to have them connected 

question 2 how i stretch trough port channel 

[Francesco Molino]

Yes you can add vlans on your port-channel in trunk mode the same way you do with a single interface, like:
interface port-channel x
switchport mode trunk
switchport trunk allowed vlan 2-5,7,10,99

Let's say all vlans are your data vlans except the 99. The vlan 99 can be used to build up a L3 routing protocol and get all sites connected in L3 except very few vlans (for specific servers) on which you want to move vm machines.

[Joseph W. Doherty]

If you have a L2 connection between sites, you can treat it just as you would if it were at the same site LAN. However, LAN or MAN, as you have L3 switches, the optimal logical topology might not be just L2.