Mac-address table entry not removing

Unanswered Question
Nov 16th, 2007
User Badges:

Hi,


I have a VMware server with a teamed NIC. Each NIC is connected into a separate Cat 6513 switch.


The 2 6513s are connected to each otehr via a Layer 2 etherchannel trunk and all vlans are trunked across this.


In normal operation, the VMWare servers' Mac-address is seen via the connected port on router A. When we shut down this port, the mac-address moves to the connected port on router B as is to be expected.


Here's the problem.


When we re-enable the 1st port, the MAC-address is now seen via both ports and we have connectivity issues.


To add to the confusion, if spanning-tree is enabled on these ports, everything works correctly and the mac-address moves back.


With spanning-tree portfast enabled (as recommended by vmware) we get this problem. To resume connectivity we have to manually clear the mac-address table entry from router b.


Also, note, these ports are trunk ports so we use the "spanning-tree portfast trunk" command to enable portfast.


Any ideas ?


Cheers


Lee

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
xcz504d1114 Fri, 11/16/2007 - 08:57
User Badges:
  • Bronze, 100 points or more

We had similar problems, ended up creating a broadcast storm in the end. Our problem ended up being the software used to team the NIC's on the server. I don't remember if we were using the built in microsoft or third party software, but one of them caused the problem.


Good luck in finding your issue.

Actions

This Discussion