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Cisco Employee

Bridging over Frame relay

I have a situaton where i have to bridge Ethernet traffic over frame-relay multipoint interface. The Router is connected to 3 spoke sites and all connected through same Multipoint interface.

How do i do this ? I have Map statements for briding etc and everthinng looks fine.

Thanks in advance.

7 REPLIES
New Member

Re: Bridging over Frame relay

Yes I have the same problem. I posted my question few days ago but no response yet. I guess it is better off trying this on other discussion groups where you can at least get your question answered.

New Member

Re: Bridging over Frame relay

I've read both of your questions and they're similar.

You can bridge over multipoint frame relay by using the "frame-relay map bridge" command. You need to be sure and add a bridge group to the interface (or sub-interface) that you've added the frame-relay map bridge command to. I also suggest that you use the "broadcast" keyword.

Also, be sure to add a bridge group to your other (probably ethernet) interface.

Remember that unless you disable IP ROUTING or enable IRB/CRB, you *cannot* bridge IP traffic!

Mick.

New Member

Re: Bridging over Frame relay

In this case how the bridge will overcome the following rule.

-If a bridge receives a frame in one port it will flood the frame to

all ports except to the port from where the packet came in.

Thanks

Cisco Employee

Re: Bridging over Frame relay

Thanks for ur answer.

I have the following doubt.The Bridge protocol follows the Split Horizon rule too.So when this is the case how will the protcol information go out on the same subinterface/interface even though its two diffrent DLCI's.

The link is a multipoint link,so when updates come in from R2(spoke) to R1 (Hub) it will not go out to R3 which is another spoke.

Am i msiing something ? i guess not. I have configured all the parameters you have said and also broadcast but it wont work ?

So what is the solution ?

New Member

Re: Bridging over Frame relay

Looks like a tunnel is required

Cisco Employee

Re: Bridging over Frame relay

Kas,

Why can't you use frame-relay p2p sub-intf? That should be able to resolve this issue.

Faraz

Cisco Employee

Re: Bridging over Frame relay

There is already point to multipoint interface with one subnet and existing two sites. What do we do then ? If its new for planning or implementation we can may be use p2p. What if there are other requirements forcing a p2mp.

Thanks for you answer.

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