Hi Farooq,
I see this happening most of the time when I have a host, dual homed to
2 different switches for HA purposes , and the host link
bonding/aggregation is configured to do load balancing instead of
active/backup.
Essentially its sending the traffic down both links, and switches learns
the MAC address from directly connected host port and from port that is
connected to the second switch.
check how link bonding is configured on the end host.
Anton
On 8/7/2011 10:14 AM, Farooq Razzaque wrote:
Hi All
I noticed the following messages with different timestamp on IPT SW01
(connected to IPT servers - C2960G-24TC-L)
%SW_MATM-4-MACFLAP_NOTIF: Host 001c.f6e5.17b0 in vlan 119 is flapping between
port Po1 and port Gi0/1
Here :
1) Gi0/1 is connected to Voice Gateway router
interface GigabitEthernet0/0 (Connected to IPT SW02 - Gi0/1)
no ip address
duplex auto
speed auto
media-type rj45
bridge-group 1
!
interface GigabitEthernet0/1 (Connected to IPT SW01 - Gi0/1)
no ip address
duplex auto
speed auto
media-type rj45
bridge-group 1
interface BVI1
ip address xxxxx
ntp broadcast client
ntp broadcast
h323-gateway voip interface
h323-gateway voip bind srcaddr xxxxx
2) Mac-address 001c.f6e5.17b0 is the address of interface Gi0/0 of Voice
Gateway Router and same address for BVI1
GigabitEthernet0/0 is up, line protocol is up
Hardware is BCM1125 Internal MAC, address is 001c.f6e5.17b0 (bia
001c.f6e5.17b0)
GigabitEthernet0/1 is up, line protocol is up
Hardware is BCM1125 Internal MAC, address is 001c.f6e5.17b1 (bia
001c.f6e5.17b1)
BVI1 is up, line protocol is up
Hardware is BVI, address is 001c.f6e5.17b0 (bia 001c.f6e5.17b0)
3) Po1 is the port channel on IPT SW01 (Gi0/22 and Gi0/23) and Core switch (VSS)
interface GigabitEthernet0/22
description ++++ L2 Trunk to Coreswitch ++++
switchport trunk native vlan 999
switchport trunk allowed vlan 119
switchport mode trunk
logging event trunk-status
logging event bundle-status
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet0/23
description ++++ L2 Trunk to Coreswitch ++++
switchport trunk native vlan 999
switchport trunk allowed vlan 119
switchport mode trunk
logging event trunk-status
logging event bundle-status
channel-protocol lacp
channel-group 1 mode active
Appreciate your help
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