We are currently facing a weird situation. We installed a new cisco switch 2960 lets call it Switch_floor_2 as in the below diagram
Core_switch --> Switch_floor_1--> Switch_floor_2
After the installation we were unable to telnet to the switch using its management IP. Precisely out of 10 Icmp Echo Requests we are getting only 1-2 replies.
The weird thing is that the Core_switch is learning the mac-address of the management IP of Switch_floor_2 from 2 vlans.
The one is the management vlan (Vlan 500) and the other is the vlan we are using for our Riverbed devices (VLAN 700).
In Switch_floor_2 there is nothing connected except the trunk link with Switch_floor_1.
Core_switch#show mac-address-table | include a8c1
* 700 xxxx.xxxx.a8c1 dynamic Yes 0 Fa3/11
* 500 xxxx.xxxx.a8c1 dynamic Yes 0 Gi4/5
(xxxx.xxxx.a8c1 is the mac-address of management interface vlan in Switch_floor_2 )
Is there a possibility of a duplicate mac-address in our network?