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Community Member

MAC address

I have 2948 switch running CatOS 6.3.7. One device is connected to the switch port and the port is showning connected, however we can not see the mac address of the device. Any idea how to find out the MAC address of this device..

Switch> (enable) sh cam dynamic 2/21

* = Static Entry. + = Permanent Entry. # = System Entry. R = Router Entry.

X = Port Security Entry $ = Dot1x Security Entry

VLAN Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type]

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

Total Matching CAM Entries Displayed =0

Switch> (enable) sh cam stat 2/21

* = Static Entry. + = Permanent Entry. # = System Entry. R = Router Entry.

X = Port Security Entry $ = Dot1x Security Entry

VLAN Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type]

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

Total Matching CAM Entries Displayed =0

Switch> (enable) sh port 2/21

Port Name Status Vlan Level Duplex Speed Type

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

2/21 Protego connected 5 normal a-full a-100 10/100BaseTX

Port AuxiliaryVlan AuxVlan-Status InlinePowered PowerAllocated

Admin Oper Detected mWatt mA @51V

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

2/21 none none - - - - -

Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex

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

2/21 disabled shutdown 0 0 1 disabled 29

Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left

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

2/21 0 - - - - -

Port Status Channel Admin Ch

Mode Group Id

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

2/21 connected off 86 0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize

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

2/21 - 0 0 0 0

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

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

2/21 0 0 0 0 0 0 0

Last-Time-Cleared

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

Tue Apr 17 2007, 12:20:50

4 REPLIES
Community Member

Re: MAC address

Does the device have an IP address already? If it does do a show arp | inc or you can go to the actual device and get the mac address ipaddress/all if its a windows box.

Community Member

Re: MAC address

No IP address, it's March device and we are trying to find its IP address using its MAC..

Hall of Fame Super Gold

Re: MAC address

Ahmed

From the fact that there is no entry in the CAM I am assuming that it has been longer than the CAM aging time since the device has sent any frame. If you could get the device to send a frame then its MAC address should get added to the table. Perhaps if you disable and then enable the port (drop link and bring it back up) it would get the device to send a frame (or disconnect its cable and reconnect).

HTH

Rick

Silver

Re: MAC address

I have seen this with some of my IBM OSA devices. Either recycle the port (SET PORT DISABLE/ENABLE) or the device needs to be reinitialized. The connected status is just a layer one link that is seen. The MAC is not coming across probably because the device needs to initialize traffic or be reset....Good Luck...

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