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How do I bridging two vlans across WAN?

jraarons
Level 1
Level 1

I have a routed network, but I have a need to bridge two vlans together. What is the best method to do this? Here is a sample config I wrote, but I don't think it will work -jason

begin

hostname 3825

int ser0/0.1 point-to-point

encap hdlc

ip address 172.16.1.1 255.255.255.252

description T1 WAN carrying bridged and routed traffic

!

int fe0/0.250

ip address 10.128.250.1 255.255.254.0

description Routed traffic

!

int fe0/0.252

ip address 10.128.252.1 255.255.255.0

description Routed traffic

!

int fe0/0.253

description no ip address Bridged AP Traffic

bridge 10

!

int bvi0

bridge 10

!

bridge 10 irb

bridge 10 protocol ieee

bridge 10 route ip

end

begin

hostname 2811

!

int ser0/0/1 point-to-point

ip address 172.16.1.2 255.255.255.252

description T1 WAN

bridge 10

!

int fe0/0.240

ip address 10.128.240.1 255.255.254.0

description Routed traffic

!

int fe0/0.242

ip address 10.128.242.1 255.255.255.0

description Routed traffic

!

int fe0/0.253

description no ip address Bridged AP Traffic

bridge 10

!

int bvi0

bridge 10

!

bridge 10 irb

bridge 10 protocol ieee

bridge 10 route ip

end

2 Replies 2

Tony.henry
Level 1
Level 1

Jason,

Your right, this won't work. The 3825 hasn't got a bridge statement on its serial interface.

From a design perspective, another solution could be to build a GRE tunnel between both routers and have the tunnel belong to the bridge.

Benefits of this would be that the Bridged packets would be encapsulated in IP and would be subject to your IGP routing protocol. Could be encrypted if you so desired, and you won't have to do too much worrying about Spanning tree etc.

Downside would be that your router is going to be a bit busier encapsulating and decapsulating the packet at either end.

HTH

Tony

Why don't use DLSW+, that is easy way to do it

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