1.2 IP Bridging

Dear All,

I can't ping R1 and R3 from R6. Here is output.

R6#sh int irb

FastEthernet0/0

 Not bridging this sub-interface.

FastEthernet0/0.16

 Routed protocols on FastEthernet0/0.16:
  ip      

 Bridged protocols on FastEthernet0/0.16:
  clns       ip      

 Software MAC address filter on FastEthernet0/0.16
  Hash Len    Address      Matches  Act      Type
  0x00:  0 ffff.ffff.ffff         0 RCV Physical broadcast
  0x37:  0 000f.f7b9.1fc0         0 RCV Interface MAC address
  0x37:  1 000f.f7b9.1fc0         0 RCV Bridge-group Virtual Interface
  0xC1:  0 0100.0ccc.cccd         5 RCV SSTP MAC address
  0xC2:  0 0180.c200.0000         0 RCV IEEE spanning tree

FastEthernet0/0.36

 Routed protocols on FastEthernet0/0.36:
  ip      

 Bridged protocols on FastEthernet0/0.36:
  clns       ip      

 Software MAC address filter on FastEthernet0/0.36
  Hash Len    Address      Matches  Act      Type
  0x00:  0 ffff.ffff.ffff         0 RCV Physical broadcast
  0x37:  0 000f.f7b9.1fc0         0 RCV Interface MAC address
  0x37:  1 000f.f7b9.1fc0         0 RCV Bridge-group Virtual Interface
  0xC1:  0 0100.0ccc.cccd         4 RCV SSTP MAC address
  0xC2:  0 0180.c200.0000         0 RCV IEEE spanning tree

Serial0/0

 Routed protocols on Serial0/0:
  ip      

FastEthernet0/1

 Routed protocols on FastEthernet0/1:
  ip      
         
BVI1

 Routed protocols on BVI1:
  ip      

Loopback0

 Routed protocols on Loopback0:
  ip      
R6#

 

R6#
R6#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES NVRAM  up                    up     
FastEthernet0/0.16         unassigned      YES unset  up                    up     
FastEthernet0/0.36         unassigned      YES unset  up                    up     
Serial0/0                  54.1.3.6        YES NVRAM  up                    up     
FastEthernet0/1            204.12.1.6      YES NVRAM  up                    up     
Serial0/1                  unassigned      YES NVRAM  administratively down down   
BVI1                       136.1.136.6     YES NVRAM  up                    up     
Loopback0                  150.1.6.6       YES NVRAM  up                    up     
R6#

 

I have used a Hub to connect R1, R6 and R3.

R1#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            136.1.136.1     YES manual up                    up     
Serial0/0                  136.1.15.1      YES manual up                    up     
FastEthernet0/1            unassigned      YES unset  administratively down down   
Serial0/1                  unassigned      YES unset  administratively down down   
Loopback0                  150.1.1.1       YES manual up                    up    

 

 

R3#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            136.1.3.3       YES manual up                    down   
Serial0/0                  unassigned      YES unset  administratively down down   
FastEthernet0/1            136.1.136.3     YES manual up                    up     
Serial0/1                  136.1.23.3      YES manual up                    down   
Ethernet1/0                unassigned      YES unset  administratively down down   
Loopback0                  150.1.3.3       YES manual up                    up     
R3#

 

Comments

  • I get the same strang problem. But I don't think my config loaded correctly. I can't ping R1 or R3.

    Rack25R1(config-if)#do sho ip int brief
    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0/0            136.25.136.1    YES manual up                    up     
    Serial0/0                  unassigned      YES unset  administratively down down   
    Serial0/1                  unassigned      YES unset  administratively down down   
    Loopback0                  150.25.1.1      YES manual up                    up

    Rack25R1(config-if)#do sho cdp ne
    Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                      S - Switch, H - Host, I - IGMP, r - Repeater

    Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
    Rack25SW1        Fas 0/0            178         S I       WS-C3560- Fas 0/1

     

    Rack25R3#sho ip int brief
    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0/0            136.25.3.3      YES manual up                    up     
    FastEthernet0/1            136.25.136.3    YES manual up                    up     
    Serial1/0                  unassigned      YES unset  administratively down down   
    Serial1/1                  unassigned      YES unset  administratively down down   
    Serial1/2                  unassigned      YES unset  administratively down down   
    Serial1/3                  136.25.23.3     YES manual up                    down   
    Loopback0                  150.25.3.3      YES manual up                    up     
    Rack25R3#sho cdp ne
    Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                      S - Switch, H - Host, I - IGMP, r - Repeater

    Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
    Rack25SW1        Fas 0/0            167         S I       WS-C3560- Fas 0/3
    Rack25SW3        Fas 0/1            166         S I       WS-C3550- Fas 0/3

  • Please check following

    Ensure that R1 Ethernet interface is connected to SW1 port1. SW1 interface 1 is in VLAN 16. All ports status are up (Router and Switch)

    Ensure that R3 Ethernet interface is connected to SW1 port 3. SW1 interface 3 is in VLAN 36. All ports status are up (router and switch)

    Ensure that R6 has two sub-interface, 0.16 and 0.36 and allowed VLAN 16 and 36 respectively. All sub-interfaces status are up

    Ensure that R6 ethernet has connection to SW2 port 6 and Setup as trunk. All ports status are up. (router and Switch)

    Ensure  that SW2 interface 6 allowed for VLAN 16, 36

    Ensure that SW2 trunks interfaces to SW1 also allowed for VLAN 16, 36

    Ensure that SW1 trunks interfaces to SW2 also allowed for VLAN 16, 36

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