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?

# posted by Cisco da Gama @ 1:46 PM
Comments:
Are other types of traffic being bridged, ie the ARP? Is the router trying to route the IP ala IRB?
# posted by Anonymous Anonymous : Thu Mar 16, 07:43:00 AM 2006
 
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
# posted by Anonymous Anonymous : Thu Mar 16, 03:26:00 PM 2006
 
That's correct Rich. The frame relay map statements were missing and had to be added.
# posted by Blogger Cisco da Gama : Sat Mar 18, 03:29:00 PM 2006
 
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