Wednesday, March 15, 2006

 

Bridging Ethernet segments over Frame Relay. (Question #39)

Consider two routers connected via a frame relay link in order to bridge ethernet segments connected to the ethernet interfaces of each of the routers across that frame relay link. With the configuration shown below for each of the routers, bridging across frame relay does not work. Hosts connected to the ethernet interfaces of the two routers are unable to ping each other. The frame relay connection has itself been verified to be working fine.

Router1

no ip routing
!
interface Ethernet0/0
no ip address
no keepalive
bridge-group 1
!
interface Serial2/0
no ip address
encapsulation frame-relay
frame-relay interface-dlci 204
bridge-group 1
!
bridge 1 protocol ieee


Router2

no ip routing
!
interface Ethernet0/0
no ip address
no keepalive
bridge-group 1
!
interface Serial2/0
no ip address
encapsulation frame-relay
frame-relay interface-dlci 402
bridge-group 1
!
bridge 1 protocol ieee


What needs to be done to get the bridging to work correctly?

Comments:
Are other types of traffic being bridged, ie the ARP? Is the router trying to route the IP ala IRB?
 
Router1

no ip routing
!
interface Ethernet0/0
no ip address
no keepalive
bridge-group 1
!
interface Serial2/0
no ip address
encapsulation frame-relay
frame-relay map bridge 204 broadcast
bridge-group 1
!
bridge 1 protocol ieee

Router2

no ip routing
!
interface Ethernet0/0
no ip address
no keepalive bridge-group 1
!
interface Serial2/0
no ip address
encapsulation frame-relay
frame-relay map bridge 402 broadcast
bridge-group 1
!
bridge 1 protocol ieee
 
That's correct Rich. The frame relay map statements were missing and had to be added.
 
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