VLANS across routers

Is the following setup possible:

(VLAN10)--Switch1--Router1--WAN--Router2--Switch2--(VLAN10)

Basically, having the same VLAN across multiple locations, that are segmented by routers.

Ex:

Router1:
Fast 0/0: 172.25.4.1 /23
Fast 0/0.10: 172.25.18.2 /23
Ser 0/0: 172.25.0.17 /30

Router2:
Fast 0/0: 172.25.10.1 /23
Fast 0/0.10: 172.25.18.5 /23
Ser 0/0: 172.25.0.18 /30

The idea is to have the 172.25.18.1-172.25.19.254 network distributed across 8 buildings (VoIP phones, to be precise). Each building must maintain its current 172.25.x.x /23 scheme. My guess is that since each router thinks the 172.25.18.x network is directly connected, this may not work.

Any ideas?

Thanks

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Comments

georgemc

Won't work across routers. You can't have the same subnet on 2 separate routers unless they are in the same local segment, such as when running HSRP.

What kind of backbone network are you running between the buildings (ATM, GIG-E, T1/E1, etc.)?

deneb829

Can you bridge the VLAN through the routers?

mp3spy

deneb829 wrote:

Can you bridge the VLAN through the routers?

Still won't work because Routers break up the Broadcast domain. Routers can fowards packets to other LAN segments/VLANS. Just utilize a class C and break the network into seperate subnets within that range...