L2 Vlan stretch over L3 didicated gig link

[mvsheik123]

Hello Experts,

We have a L3 gig link between 2 locations (6513 <-->4507). Each location got its own addressing scheme and vlan interfaces on the edge switches.

For our new exchange servers, I received a requirement on having the possibility of single vlan at both locatons. so that the all the replicaton traffic between both location servers (Prod/DR). Ex: Create a new vlan at 6500 site with an addressing scheme 192.168.100.x and having the same addressing scheme vlan stretched over the L3 link to 4500. The link is not MPLS. I read few posts in the forum and seems it is possible if we have MPLS.  OSPF is the routing protocol. Please suggest.

6513:

interface GigabitEthernet6/6

description :GIG LINK to DR

ip address 10.60.10.1 255.255.255.252

logging event link-status

speed nonegotiate

udld port aggressive

!

4507R

interface GigabitEthernet1/1

description :GIG LINK to PROD

ip address 10.60.10.2 255.255.255.252

logging event link-status

speed nonegotiate

udld port aggressive

!

Thanks in advance

MS

[Jon Marshall]

MS

Without MPLS you could do this -

1) use 2 vlans - one for peering and one for the exchange servers eg.

vlan 100 - peering

vlan 101 - exchange

2) make the link a trunk link -

int gi/6/6

switchport encpasulation dot1q

switchport mode trunk

switchport trunk allowed vlan 100,101 <-- this is important, you need to make sure only those 2 vlans are allowed on the trunk

same config on 4500 end

3) create L3 vlan interfaces for vlan 100

int vlan 100

ip address 10.60.10.1 255.255.255.252

same on 4500

int vlan

ip address 10.60.10.2 255.255.255.252

4) then you peer with OSPF on vlan 100

With this setup communication between subnets/vlans in the 2 sites has to be routed over vlan 100 except for vlan 101 which can be L2 switched.

Jon

[Edison Ortiz]

You need to encapsulate your L2 traffic in order to traverse a L3 backbone.

With a 6500, the only option is EoMPLS which as you stated it requires MPLS in the backbone.

There isn't any option with the 4500 as the edge router.

If you have a budget, you can purchase a pair of router and form a L2TPv3 tunnel between locations.

This will extend your 100.x subnet

These routers can be placed behind the 6500 and 4500 switches so you don't need to change your topology much.

[mvsheik123]

Hi Jon and Edison,

Thank you very much for your reply.

Jon,  when we make the swithports that are connecting to carrier equipment on both ends as trunks (from L3), I assume

that might cause issues.

Edison, I will check on the L2TPv3 docs. Also, we just found a doc which is showing the 'DAG' need not to be on single

vlan.

http://technet.microsoft.com/en-us/library/dd638104.aspx#NR

Thank you

MS