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New Member

Cisco 4506 Mac Address disappears from configured port.

I have two Cisco 4506's running cat4500-ipbase-mz.122-50.SG3.bin. Periodically, when attaching a new workstation to these switches the Mac Address of the device disappears off the port when the device is connected or the port is configured. The only way to correct the issue is to do a hardware reset on the blade or reboot the switch. After resetting the blade or rebooting the switch the devices will start showing up on the port and connect. This does not effect devices that are already connected to the switch, just newly added devices

Both switches are populated with WS-X4148-RJ45, WS-X4148-RJ45V and WS-X4248-RJ45V blades. It doesn't matter which blade the new device is being connected to. I believe that this may be a "Bug" but have been unable to locate one. Has anyone seen this particular issue?

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New Member

Cisco 4506 Mac Address disappears from configured port.

I recently just started seeing this issue as well.  I find that every monday morning I need to reset the blade.  Here is a list of the modules I have installed. 

Chassis Type : WS-C4506-E

Power consumed by backplane : 0 Watts

Mod Ports Card Type                              Model              Serial No.


1     6  Sup 6-E 10GE (X2), 1000BaseX (SFP)     WS-X45-SUP6-E      JAE1222JP05

2     6  SFP, 10/100/1000BaseT (RJ45)V, Cisco/I WS-X4506-GB-T      JAE1221IIM9

3     6  SFP, 10/100/1000BaseT (RJ45)V, Cisco/I WS-X4506-GB-T      JAE1220I7RW

4     6  SFP, 10/100/1000BaseT (RJ45)V, Cisco/I WS-X4506-GB-T      JAE1220I4GC

5    48  10/100/1000BaseT Premium POE E Series  WS-X4648-RJ45V+E   JAE1539093F

6    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E   JAE1222JH6K

M MAC addresses                    Hw  Fw           Sw               Status


1 -- 1.1 12.2(44r)SG  12.2(46)SG       Ok      

2 -- 1.4                               Ok      

3 -- 1.4                               Ok      

4 -- 1.4                               Ok      

5 -- 2.0                               Ok      

6 -- 1.0                               Ok 


Cisco 4506 Mac Address disappears from configured port.

  Unless the device is sending traffic the mac address will dissapear after 5 minutes when the switch will flush the address untill the device sends traffic again. 

New Member

Cisco 4506 Mac Address disappears from configured port.

This issue is not where the mac address is timing out in the mac address table. The issue is the mac address not showing up on the switch ports when the devices are initially connected to the port.

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