Bridge across WAN link question

Unanswered Question
Oct 16th, 2008
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I have a link to our DR site that has several bridge gtroups configured to bridge three different subnets.


Two are verified up and working because we have devices in those subnets are the DR side.


The third, I have no devices in the remote side, so I cannot test unless I go there.


But I see something different in the config on the third group. Both of the other two (bridge group 1 and 2)have the bridge group applied to etherent interfaces on both sides of the bridge.


The DR side on Bridge group 3 does not have an etherent interface, only a serial.


I thought you have to have bridge group applied to ethernet AND serial.


Am I correct?


Local side

Bridge Group 3 is running the IEEE compatible Spanning Tree protocol

Port 87 (FastEthernet0/1.40 DOT1Q) of bridge group 3 is forwarding

Port 89 (Serial1/0.41 Frame Relay) of bridge group 3 is forwarding



DR side

Bridge Group 3 is running the IEEE compatible Spanning Tree protocol

Port 22 (Serial6/0.40 Frame Relay) of bridge group 3 is forwarding

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Giuseppe Larosa Thu, 10/16/2008 - 12:09
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Hello Richard,


>> Am I correct?

yes if you have a free ethernet interface on DR site you can

associate it to bridge-group 3

make it to appear up/up even if unplugged using:

int eth X

no keepalive


this is not enough to test bridging. If someone can connect a switch port to the ethernet port and put a PC on another port in the same L2 Vlan you can make your tests.

As usual no one is at DR site I suppose ..


Hope to help

Giuseppe


wilson_1234_2 Thu, 10/16/2008 - 12:58
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Thanks for the reply.


So you are saying I do not have to have an interface physically linked to the network, as long as the bridge group is associated to it?


If so, what about a loopback?



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