I have two Nexus 5010s in a vPC pair with a bunch of FEXs vPC dual-homed between them. I am encountering a problem where, from the point of view of the vPC Primary switch, a MAC address would move from the switch port its connecting to (Eth119/1/25) to the VPL port-channel (Po1). However from the point of view of the vPC Secondary switch the MAC address would remain on the switch port. I lose connectivy to the server from outside the datacenter when this happens. This is happening sporadically to only a small handful for MACs in the datacenter... most other MACs are fine.
Anyone have any clues?
switch1 -----------------
| | |
| | VPL FEX ------- server
| | |
switch2 -----------------
State 1:connectivity is fine, ping works
switch1# sh mac address-table address 0050.56a5.0002
VLAN MAC Address Type age Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
* 1 0050.56a5.0002 dynamic 0 F F Eth119/1/25
switch2# sh mac address-table address 0050.56a5.0002
VLAN MAC Address Type age Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
* 1 0050.56a5.0002 dynamic 0 F F Eth119/1/25
State 2: Connectivty lost, ping fails
switch1# sh mac address-table address 0050.56a5.0002
VLAN MAC Address Type age Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
* 1 0050.56a5.0002 dynamic 0 F F Po1
switch2# sh mac address-table address 0050.56a5.0002
VLAN MAC Address Type age Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
* 1 0050.56a5.0002 dynamic 0 F F Eth119/1/25
