MAC Move After IOS Upgrade

[DJay11]

 Hi Everyone, 

We have upgraded our Cisco 7706 (Core Switch L3) to version 8.4(10), all our HP Access switches (L2) management IP (vlan 1) is now inaccessible. The Cisco 7706 is the gateway for Vlan 1. All Cisco Access Switch are up. Problem with HP is the management only and switch works fine with no disruption with users. Upon checking logs show on the Cisco core switch below. 

2024 Sep 28 00:39:11 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac f01d.2db6.0b8c in vlan 1 has moved from Po624 to Po104
2024 Sep 28 00:39:14 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac f01d.2db6.0b8c in vlan 1 has moved from Po104 to Po624
2024 Sep 28 00:39:16 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac f01d.2db6.0b8c in vlan 1 has moved from Po624 to Po104
2024 Sep 28 00:39:16 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac 003c.104f.4847 in vlan 1 has moved from Po624 to Po109
2024 Sep 28 00:39:17 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0101 in vlan 1 has moved from Po624 to Po104
2024 Sep 28 00:39:17 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac 00fd.450a.ff40 in vlan 1 has moved from Po113 to Po624
2024 Sep 28 00:39:17 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac 9418.82b4.9740 in vlan 1 has moved from Po109 to Po624
2024 Sep 28 00:39:17 CAMPUS_VDC2 %L2FM-4-L2FM_MAC_MOVE: Mac e007.1bb6.26c0 in vlan 1 has moved from Po108 to Po624

How do I resolve this? We have around 25 HP devices that are currently down (Mgmt). 

[MHM Cisco World]

I think this not need and both issue will solve if you make root within non-mst region (pvst domain).

How to do that is list above in my previous comment.

Is this will solve issue? To so sure since we dont have idea when network was stable the root was HP (within mst region) or with non-mst region (within pvst domain)

MHM

[David Ruess]

Hello,

Do you have multiple ports going to the same device downstream? We had that issue not long ago and it was 2 ports connected to the same server, so the server was load balancing but the switch wasn't. You may need to bundle/port-channel ports together if the same MAC is seen on both ports.

-David

[DJay11]

Physical link on these HP Switches usually has only 1 link. The only change we had is the IOS upgrade on the Cisco Switch (Gateway).  

[MHM Cisco World]

Friend 

It not issue of upgrading 

What happened is

After upgrading you so reboot this make SW in domain elect new root' this new abd I think it HP elect as root and this topolgy change block link' and hence you can not reachout the SW.

Why vlan1 ? Because Cisco untag vlan1 and this with wrong root elect cause issue in your network.

MHM

[DJay11]

And this loop escalated to our data center network since vlan 1 has been propagated. How do I correct the Portchannel issue as it creates a frequent mac move? 

[DJay11]

Update: We still see mac move in transport VDC (Layer 2 only) which causes some intermittent connection to Core VDC. We made some isolation and eventually disabled the Portchannel616 on Core VDC 1 going to Transport VDC 1. No more mac move seen on the logs and network stabilized. Does the other leg of the portchannel616 on Core VDC 1 causes the loop? How do we correct this before activating it back for redundancy?