I have read some of the other posts, but cannot seem to find the reason for some Windows Hosts flapping on Port Channel.
We have a brand new Cisco Switch (WS-C3650-48PS) running Cat3K_caa_universalk9 03.06.06.E. The We have a few Windows Hosts plugged in - all of which are Windows 2012 R2.
NIC Teaming is enabled on the Windows Hosts, and is set to LACP/Dynamic.
Example of a Port Channel setup:
interface Port-channel110
switchport access vlan 10
switchport mode access
lacp max-bundle 2
The switch ports assigned to this port channel:
interface GigabitEthernet1/0/7
switchport access vlan 10
switchport mode access
channel-protocol lacp
channel-group 110 mode active
spanning-tree portfast
spanning-tree bpdufilter enable
!
interface GigabitEthernet1/0/8
switchport access vlan 10
switchport mode access
channel-protocol lacp
channel-group 110 mode active
spanning-tree portfast
spanning-tree bpdufilter enable
The Host MAC address for the Teamed Adapters, will regularly (at least once a week) generate a flapping error to our Network Monitoring Software. The Host will flap between Port Channel 1, and the Channel above.
Port Channel 1 is the connection from this Switch to the Core Switch (3750). Here is the configuration of the ports in this Channel:
interface GigabitEthernet1/0/1
description ***Server Backbone - to Core - Trunk***
switchport trunk allowed vlan 10
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on
!
interface GigabitEthernet1/0/2
description ***Server Backbone - to Core - Trunk***
switchport trunk allowed vlan 10
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on
I can verify that the Host in question (and in fact all hosts on this switch) are only plugged into this switch for VLAN 10 Access.
We are also having issues with this particular Switch - it will stop responding to its VLAN 10 IP Address (monitoring software will lose connectivity) - it has also rebooted itself a couple of times, so we may also be dealing with a Hardware issue.
At any rate, I would like to clear the flapping issue first, to see if it resolves some of the other things we are seeing.
