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Configuring Cisco Switches

I have the topology above...
both switches can see both routers mac addresses but cannot ping each other

R1#sh ip interface br | inc up
Ethernet0/0                192.168.12.1    YES manual up                    up  
R1#

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SW1#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2
SW1#

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SW2#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2

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R2#sh ip interface brief | inc up
Ethernet0/0                192.168.12.2    YES manual up                    up  
R2#

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R1#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0100 (bia aabb.cc00.0100)

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R2#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0400 (bia aabb.cc00.0400)

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But I still cannot ping between R1 and R2

R1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#

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James Bunch

What model is the switches?

Did you set these up from scratch and deploy? If managed and nicer ones, they may have ICMP Echo requests disable and even if up and communicating may reject ping.

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Don Johnston

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Don Johnston

R2 is in VLAN 1 and R1 is in VLAN 10. Put them both in the same VLAN and it should work.

jskfan

ASKER

Not sure what fixed it...
All I did was "Clear mac address-table dynamic"

Ping works now :

R1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/2 ms
R1#

jskfan

ASKER

That rings the Bell John
now shows correct :

SW1#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
  10    aabb.cc00.0100    DYNAMIC     Et0/0
  10    aabb.cc00.0400    DYNAMIC     Et0/1
Total Mac Addresses for this criterion: 2
SW1#

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SW2#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
  10    aabb.cc00.0100    DYNAMIC     Et0/0
  10    aabb.cc00.0400    DYNAMIC     Et0/1
Total Mac Addresses for this criterion: 2
SW2#

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I wonder id clearing mac address table dynamic resolved that

Don Johnston

Your MAC address table was stale. Entries were created when the routers were in different VLANs. Flushing the table fixed it.

jskfan

ASKER

Now if I add a switch between SW1 and SW2, do I need to create VLAN 10 for R1 and R2 to be able to ping each other ?

Don Johnston

Yep (if layer 2 switches).

jskfan

ASKER

Thank you Guys..
I will LAB the second case and post a question