MAC Flapping Port and Physical interfaces

[uni1389]

Hi Team, 

am using 2x9300 catalyst switches and i have configure two interface from server with two different VLAN 148, 14 and between two switches I have port Chanel with trunk . am getting this error on both switches , thanks in advance for your assistance.

 =============================== ===============================

%SW_MATM-4-MACFLAP_NOTIF: Host XXXX in vlan 14 is flapping between port Po1 and port Twe1/0/6
%SW_MATM-4-MACFLAP_NOTIF: Host YYYY in vlan 148 is flapping between port Po1 and port Twe1/0/5
%SW_MATM-4-MACFLAP_NOTIF: Host XXXX in vlan 14 is flapping between port Po1 and port Twe1/0/6
%SW_MATM-4-MACFLAP_NOTIF: Host YYYY in vlan 148 is flapping between port Po1 and port Twe1/0/5

 =============================== ===============================
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 10,14,101,148 priority 28672

 =============================== ===============================
interface TwentyFiveGigE1/0/5
switchport access vlan 148
switchport mode access
spanning-tree portfast
end

interface TwentyFiveGigE1/0/6
switchport access vlan 14
switchport mode access
spanning-tree portfast

 =============================== ===============================

show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

A - formed by Auto LAG

Number of channel-groups in use: 1
Number of aggregators: 1

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Twe1/0/3(P) Twe1/0/4(P)

#show run interface twentyFiveGigE 1/0/3
!
interface TwentyFiveGigE1/0/3
switchport trunk allowed vlan 10,14,101,148
switchport mode trunk
channel-group 1 mode active
end

interface TwentyFiveGigE1/0/4
switchport trunk allowed vlan 10,14,101,148
switchport mode trunk
channel-group 1 mode active
end
interface Port-channel1
switchport trunk allowed vlan 10,14,101,148
switchport mode trunk
end

 =============================== ===============================

regards

[MHM Cisco World]

Share the 

Show interface trunk 

Show spanning tree vlan 14/148

For both SW

MHM

[uni1389]

show interfaces trunk

Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Po1 14,10,101,148

Port Vlans allowed and active in management domain
Po1 14,10,101,148

Port Vlans in spanning tree forwarding state and not pruned
Po1 14,10,101,148

show spanning-tree vlan 148

VLAN0148
Spanning tree enabled protocol rstp
Root ID Priority 28720
Address f839.18d1.a580
Cost 1000
Port 3049 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 28720 (priority 28672 sys-id-ext 48)
Address f839.18e0.b380
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Twe1/0/5 Desg FWD 2000 128.5 P2p Edge
Po1 Root FWD 1000 128.3049 P2p

show spanning-tree vlan 14

VLAN0014
Spanning tree enabled protocol rstp
Root ID Priority 28676
Address f839.18d1.a580
Cost 1000
Port 3049 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 28676 (priority 28672 sys-id-ext 4)
Address f839.18e0.b380
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Twe1/0/6 Desg FWD 2000 128.6 P2p Edge
Po1 Root FWD 1000 128.3049 P2p

*********************************************************************************************************

show interfaces trunk

Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Po1 Po1 10,14,101,148

Port Vlans allowed and active in management domain
Po1 Po1 10,14,101,148

Port Vlans in spanning tree forwarding state and not pruned
Po1 Po1 10,14,101,148

show spanning-tree vlan 14

VLAN0014
Spanning tree enabled protocol rstp
Root ID Priority 28676
Address f839.18d1.a580
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 28676 (priority 28672 sys-id-ext 4)
Address f839.18d1.a580
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Twe1/0/6 Desg FWD 2000 128.6 P2p Edge
Po1 Desg FWD 1000 128.3049 P2p

show spanning-tree vlan 148

VLAN0148
Spanning tree enabled protocol rstp
Root ID Priority 28720
Address f839.18d1.a580
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 28720 (priority 28672 sys-id-ext 48)
Address f839.18d1.a580
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Twe1/0/5 Desg FWD 2000 128.5 P2p Edge
Po1 Desg FWD 1000 128.3049 P2p

[MHM Cisco World]

this your topolgy ?
I need confirm to check in which point we start troubleshooting 

MHM

[uni1389]

yes. thanks

[MHM Cisco World]

In server the two link to SW1 config to send tag or untag frame ?

If it config to send tag frame make sure you use correct vlan ID' the server can misconfig vlan-id per link

MHM