From: Miguel Trejo (mike.trejo@gmail.com)
Date: Tue Jun 19 2007 - 15:25:15 ART
Ok you may have hit this one already, but here is my understanding on why
this happens.
CRB is LAN bridging. Sure you can use Serial or frame-relay interfaces to
bridge the traffic and this is one of the main purposes of it, but there is
no way you can bridge WAN encapsulations. When you bridge out the serial
interfaces on the hub and try to ping from spoke to spoke you are telling
the spokes to use regular FR encap and try to reach the other side, but the
hub will only bridge Ethernet frames encapsulated on FR headers. When you
add the BVI interfaces on the hub and you make the router aware this is a
bridged interface you actually force it to encapsulate Ethernet frames on
Frame Relay. You even have ARP entry for the other side or you should.
HTH
Miguel
On 6/13/07, Eric Poulin <epoulins@yahoo.com> wrote:
>
> Hi GS,
>
> I am trying to bridge between two Spokes using CRB on the Hub. On the
> Spokes, I have
> assigned their IP on the main interface and also defined a "frame map ip"
> statement, but
> for some reasons I just can't ping across from Spoke to Spoke. On the Hub,
> everything
> looks fine, and the spanning tree is in forwarding state for both
> interfaces.
>
> Now if I change my configuration on the Spokes and use IRB with the IP
> assigned on the
> BVI interface, everything works fine and I can ping from Spoke to Spoke.
>
> Can anyone explain me why the following configuration does not work?
>
> Thanks for your feedback,
> Eric
>
>
> -------------HUB-------------
> bridge crb
> bridge 1 protocol ieee
>
> interface Serial0/0
> no ip address
> encapsulation frame-relay
> !
> interface Serial0/0.102 multipoint
> frame-relay map bridge 102 broadcast
> bridge-group 1
> !
> interface Serial0/0.103 multipoint
> frame-relay map bridge 103 broadcast
> bridge-group 1
>
> -------------SPOKE1-------------
> interface Serial1/0
> ip address 142.1.23.3 255.255.255.254
> encapsulation frame-relay
> frame-relay map ip 142.1.23.2 301 broadcast
>
> -------------SPOKE2-------------
> interface Serial0/0
> ip address 142.1.23.2 255.255.255.254
> encapsulation frame-relay
> frame-relay map ip 142.1.23.3 201 broadcast
>
>
>
>
>
>
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