Frame Relay Bridging

VLAN 16 and 22 are broadcast capable segments only. The requirement here is that these two networks are bridged together.

R1
int fa0/0
bridge-group 1

int s2/0
bridge-group 1

int BVI1
ip address 192.10.1.1 255.255.255.0

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

int s2/0
frame-relay map bridge 102 br


R2
int fa0/0
bridge-group 1

int s2/0
bridge-group 1

int BVI1
ip address 192.10.1.2 255.255.255.0

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

int s2/0
frame-relay map bridge 201 br

R1#s frame map
Serial2/0 (up): bridge dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active

R1#p 192.10.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.10.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
R1#p 192.10.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.10.1.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 32/44/68 ms


In the above config i also connect the bridge group to the router via the BVI router interface. Since the bridged segment is logically one segment i put the routable protocol information on the BVI, and its ip address applies to all interfaces in the bridge group. The IOS treats the BVI as any other interface and so enables routing between the bridge group and the routed interfaces in the router.


cisco doc
http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_transprnt_brdg_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1004971