07-31-2014 03:11 PM - edited 03-07-2019 08:14 PM
Hi all, I have two switches connected in cross-3750X stack into a single SW 6500., But I get the following error appears.
18w2d: %SW_MATM-4-MACFLAP_NOTIF: Host 0012.950a.9952 in vlan 10 is flapping between port Gi5/0/46 and port Gi6/0/44
What can i do?
Thank you very much¡¡.
07-31-2014 03:36 PM
What is this machine with a MAC address of "0012.950a.9952"? What is the configuration for ports Gi5/0/46 & Gi6/0/44?
This error message is common when etherchannel is not configured properly at either ends.
07-31-2014 03:46 PM
forget the MAC this is a example.... on the attahcment you can see the error... yes maybe is a problem with etherchannel.
SW6500-------------SW3750X(1)
-------------SW3750(2)
is conexion among one 6500 and two 3705X.
when i create the portchannel this issue appear.
07-31-2014 07:51 PM
Are the two 3750 in a stack?
08-01-2014 12:24 AM
The configuration on the port channel is that all the port must be with the equal configuration :
For example :
interface Port-channel1
description IDC-TO6500 - 192.168.0.12
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet1/0/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
channel-protocol lacp
channel-group 1 mode active
!
The same configuration is on the 3750 :
interface Port-channel1
description IDC-TO3750 - 192.168.0.12
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet1/0/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,54,136,192,432
switchport mode trunk
speed 100
duplex full
channel-protocol lacp
channel-group 1 mode active
!
08-04-2014 04:59 PM
yes, they are.¡
07-31-2014 04:04 PM
Hello
If you know your physical topology then somewhere between you switches you have a loop
show spanning-tree vlan 10
This will show you what ports are forwarding and its is also where you should discover what port shouldn't be in a forwarding state which is causing the stp loop
res
Paul
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