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New Member

Ghost entry in CAM table.

Hi All,

Here is my topology and i configured etherchannel using the two Fa0/1,Fa0/2 ports.

ether.PNG

Here is the output from "show mac-address-table"

Switch1#show mac-

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0001.4235.89de    DYNAMIC     Po1

   1    000a.4162.e601    DYNAMIC     Fa0/1

   1    000a.4162.e602    DYNAMIC     Fa0/2

   1    0090.0cd2.b55e    DYNAMIC     Po1

   1    00d0.d303.c598    DYNAMIC     Fa0/15

Switch2>show mac-a

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0000.0ca2.138b    DYNAMIC     Po1

   1    0003.e467.9001    DYNAMIC     Fa0/1

   1    0003.e467.9002    DYNAMIC     Fa0/2

   1    0040.0b5b.6c9e    DYNAMIC     Po1

   1    00d0.d303.c598    DYNAMIC     Po1

Switch2>ex

From where did the bolded interface come into play. Can someone please let me know ? I'm i missing anything basics?

Regards,
Chandu       

Regards, Chandu
Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions

Re: Ghost entry in CAM table.

It seems that the c3560 in PT shows the portchannel-interface but the c2960 does not:

c3560# show interfaces

(...)

Port-channel 1 is up, line protocol is up (connected)

  Hardware is Lance, address is 0001.9681.e02c (bia 0001.9681.e02c)

(...)

c2960# show mac address-table dynamic

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0001.639b.7801    DYNAMIC      Fa0/1

   1    0001.639b.7802    DYNAMIC      Fa0/2

   1    0001.9681.e02c    DYNAMIC      Po1

HTH

Rolf

4 REPLIES
New Member

Ghost entry in CAM table.

Forgot to bold the ghost MAC's

Switch1#show mac-

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0001.4235.89de    DYNAMIC     Po1

   1    000a.4162.e601    DYNAMIC     Fa0/1

   1    000a.4162.e602    DYNAMIC     Fa0/2

   1    0090.0cd2.b55e    DYNAMIC     Po1

   1    00d0.d303.c598    DYNAMIC     Fa0/15

Switch2>show mac-a

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0000.0ca2.138b    DYNAMIC     Po1

   1    0003.e467.9001    DYNAMIC     Fa0/1

   1    0003.e467.9002    DYNAMIC     Fa0/2

   1    0040.0b5b.6c9e    DYNAMIC     Po1

   1    00d0.d303.c598    DYNAMIC     Po1

Switch2>ex

Are these two the mac address of the port-channel interfaces ? If yes, then how can i see that ?

Regards,
Chandu

Regards, Chandu

Ghost entry in CAM table.

Chandu,

you can try 'show interfaces Po1', the second line of the output should show the MAC address.

If PT supports it, you can also try 'show interfaces | include line pro|bia' to see all interfaces MAC addresses.

HTH

Rolf

New Member

Ghost entry in CAM table.

Hi Rolf,

It seems like PT is not supported to show interfaces po 1 and also the show interfaces command didn't show up the portchannel interface.. it just showed all the physical interfaces & Vlan interface.

So i think this is one more of the limitiation of PT.

And so finally, to conclude those MAC where of portchannels only right ?

Thanks for you help.

Regards,
Chandu

Regards, Chandu

Re: Ghost entry in CAM table.

It seems that the c3560 in PT shows the portchannel-interface but the c2960 does not:

c3560# show interfaces

(...)

Port-channel 1 is up, line protocol is up (connected)

  Hardware is Lance, address is 0001.9681.e02c (bia 0001.9681.e02c)

(...)

c2960# show mac address-table dynamic

          Mac Address Table

-------------------------------------------

Vlan    Mac Address       Type        Ports

----    -----------       --------    -----

   1    0001.639b.7801    DYNAMIC      Fa0/1

   1    0001.639b.7802    DYNAMIC      Fa0/2

   1    0001.9681.e02c    DYNAMIC      Po1

HTH

Rolf

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