MAC Table

LSDJR
LSDJR used Ask the Experts™
on
How do I get a client's mac address to show up in the mac table on a Cisco 6509?

Some MACs show up and some don't. I'm looking a device on this switch and I know the device is there and I can ping it, but I can't find the port because the MAC doen't show up in the table.

sh mac-table dyn add etc...
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Author

Commented:
Some MACs show up and some don't. I'm looking a device on this switch and I know the device is there and I can ping it, but I can't find the port because the MAC doen't show up in the table.

sh mac-table dyn add etc...
Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Please try the following:

sh mac address-table

traceroute mac ?
  H.H.H      48-bit hardware address of source
  interface  Interface on which this source mac exists
  ip         Specify ip addresses

Author

Commented:
I'm not sure what I should be using for the source. I've tried using the mac from the vlan interface of the device I'm looking for and I've tried the mac for the management vlan.  I get the following:

Error: Mac found on multiple vlans.
Layer2 trace aborted.
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Head of IT Security Division
Top Expert 2010
Commented:
what showing 'sh mac address' ?

Author

Commented:
Interesting. I shows up now, using any one of the sh mac commands. I guess they're all the same.

sh mac-address-table dyn address 00c0.8b05.e555

I guess I was mistaken and it's not on this switch, becasue it show up on port Po1.

Author

Commented:
No explaination for what might be going on.  Just run the commands that I was already running.

What I was looking for eventually showed up, which helped me to determine I was looking on the wrong switch.  

Not enough of an explaination on what to do when this a happens or why it happens. I've seen it before when I know I'm on the right switch.  

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