Cisco bridging
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This is another experimental page to record bridging functionality between 2 routed interfaces on a router. Used example is from GNS3, ios 12.4T, c3725, working.
- Bridging router - IRB
Current configuration : 2331 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip icmp rate-limit unreachable ip cef ! ! no ip dhcp use vrf connected ! ip dhcp pool LAN network 10.0.10.0 255.255.255.0 default-router 10.0.10.1 dns-server 10.0.10.1 8.8.8.8 domain-name lan.gateway lease 0 8 ! ip dhcp pool Management network 10.0.99.0 255.255.255.0 default-router 10.0.99.100 dns-server 10.0.99.100 8.8.8.8 domain-name management.gateway lease 0 8 ! ! no ip domain lookup ! multilink bundle-name authenticated ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! archive log config hidekeys ! ! ! ! ip tcp synwait-time 5 bridge irb ! ! ! ! interface FastEthernet0/0 no ip address speed 100 full-duplex bridge-group 1 bridge-group 1 spanning-disabled ! interface FastEthernet0/0.10 encapsulation dot1Q 10 bridge-group 10 bridge-group 10 spanning-disabled ! interface FastEthernet0/0.20 encapsulation dot1Q 20 bridge-group 20 bridge-group 20 spanning-disabled ! interface FastEthernet0/0.99 encapsulation dot1Q 99 native bridge-group 99 bridge-group 99 spanning-disabled ! interface FastEthernet0/1 no ip address speed 100 full-duplex bridge-group 1 bridge-group 1 spanning-disabled ! interface FastEthernet0/1.10 encapsulation dot1Q 10 bridge-group 10 bridge-group 10 spanning-disabled ! interface FastEthernet0/1.20 encapsulation dot1Q 20 bridge-group 20 bridge-group 20 spanning-disabled ! interface FastEthernet0/1.99 encapsulation dot1Q 99 native bridge-group 99 bridge-group 99 spanning-disabled ! interface BVI1 no ip address ! interface BVI10 ip address 10.0.10.1 255.255.255.0 ! interface BVI20 ip address 10.0.20.1 255.255.255.0 ! interface BVI99 ip address 10.0.99.100 255.255.255.0 ! ip forward-protocol nd ! ! no ip http server no ip http secure-server ! cdp source-interface BVI99 ! ! ! ! ! ! control-plane ! bridge 10 protocol ieee bridge 10 route ip bridge 20 protocol ieee bridge 20 route ip bridge 99 protocol ieee bridge 99 route ip ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 privilege level 15 logging synchronous line aux 0 exec-timeout 0 0 privilege level 15 logging synchronous line vty 0 4 login ! ! end
- Router as switch config (being bridged)
Current configuration : 1526 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R2 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip icmp rate-limit unreachable ip cef ! ! ! ! no ip domain lookup ! multilink bundle-name authenticated ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! archive log config hidekeys ! ! ! ! ip tcp synwait-time 5 ! ! ! ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface FastEthernet1/0 switchport trunk native vlan 99 switchport trunk allowed vlan 1,10,20,99,1002-1005 switchport mode trunk ! interface FastEthernet1/1 ! interface FastEthernet1/2 ! interface FastEthernet1/3 ! interface FastEthernet1/4 ! interface FastEthernet1/5 ! interface FastEthernet1/6 ! interface FastEthernet1/7 ! interface FastEthernet1/8 ! interface FastEthernet1/9 ! interface FastEthernet1/10 ! interface FastEthernet1/11 ! interface FastEthernet1/12 ! interface FastEthernet1/13 ! interface FastEthernet1/14 ! interface FastEthernet1/15 ! interface Vlan1 no ip address ! interface Vlan99 ip address 10.0.99.20 255.255.255.0 ! ip forward-protocol nd ! ! no ip http server no ip http secure-server ! ! ! ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 privilege level 15 logging synchronous line aux 0 exec-timeout 0 0 privilege level 15 logging synchronous line vty 0 4 login ! ! end