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Bridging for me is simply straightforward here in Bridging we are NOT rewriting the Layer 3 packet simply forwarding the Layer 3 information in Layer 2 frame intact from one end to other.
Today we are discussing Bridging same subnet over the WAN links , however i have taken the subnet in different VLANs just for fun to prove the reachability not depends on the local VLANs used in the LAN atmosphere.
Here i have assigned 192.168.10.1/24 to PC-1 and this is in VLAN 10 , altogether the other side PC-2 ip add is 192.168.10.2/24 and this is in VLAN 20.
We are using IRB (Integrated Routing and Bridging) for this.It mean we can Bridge and Route at the same time on the same interface.
On Router-1 and Router-2
bridge irb bridge 1 protocol ieee bridge 1 route ip
Then we assign appropriate interfaces into “bidge-group 1” on R1 and R2.
Then we will create a Virtual BVI interface on R1 and R2 to talk to the routed Serial interface and assign the ip range used as default-gateway for PC-1 and PC-2. R1(config)#int bvi 1 R1(config-if)#ip add 192.168.10.254 255.255.255.0
R1(config-if)#end
R1#
Other relevant configs are simple not any fancy stuffs used.
PC-1#sh ip route
Default gateway is 192.168.10.254
PC-2#sh ip route
Default gateway is 192.168.10.253
PC-1#sh run int fa0/0
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
no ip route-cache
duplex auto
speed auto
end
PC-2#sh run int fa0/0
interface FastEthernet0/0
ip address 192.168.10.2 255.255.255.0
no ip route-cache
duplex auto
speed auto
end
We will wait for some time for MAC address learning purpose and issue the command ” show bridge 1 verbose ” on R1 and R2 , this is very helpful command in Bridging Scenarios.
R1#sh bridge 1 verbose
Total of 300 station blocks, 297 free
Codes: P – permanent, S – self
R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.10.2 9 c205.080a.0000 ARPA BVI1
Internet 192.168.10.253 – c201.080a.0000 ARPA BVI1
Here also it looks we are learning MAC addresses from port FastEthernet 0/0 and Serial 0/0 , lets run our final verification command from PC-1 altogether over the WAN links crossing R1 and R2 over the other side PC-2.
PC-1#ping 192.168.10.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.10.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/15/32 ms
PC-2#trace 192.168.10.1
Type escape sequence to abort.
Tracing the route to 192.168.10.1
1 192.168.10.1 44 msec * 20 msec
Indeed we are successful in Bridging LAN over the WAN.
"Hey there, network enthusiasts! My name is Afroz, and I've been a CCIE for over 14 years. I work as a Network Designer, and my true passion is teaching others about the industry and sharing my knowledge through my blog and courses. I know the struggles of navigating the complex world of networking, but I firmly believe that teaching makes you a better learner and reinforces understanding. So, whether you're just starting out or a seasoned veteran, join me on this journey of learning and discovery, it will be worth it, and who knows, you might even have some fun along the way!"
"Hey there, network enthusiasts! My name is Afroz, and I've been a CCIE for over 14 years. I work as a Network Designer, and my true passion is teaching others about the industry and sharing my knowledge through my blog and courses. I know the struggles of navigating the complex world of networking, but I firmly believe that teaching makes you a better learner and reinforces understanding. So, whether you're just starting out or a seasoned veteran, join me on this journey of learning and discovery, it will be worth it, and who knows, you might even have some fun along the way!"
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Try to use excerpts and let me know..