[c-nsp] Host xxxx.xxxx.xxxx in vlan x is flapping between port Po1 and port Gi0/1

[Tóth András]

Hi,

The switch found the traffic from the specified host flapping between
the specified ports. [enet] is the host MAC address, [chars] [dec] is
the switch ID, the first and second [chars] are the ports between
which the host traffic is flapping.

Recommended Action: Check the network switches for misconfigurations
that might cause a data-forwarding loop.

http://www.cisco.com/cgi-bin/Support/Errordecoder/index.cgi?action=search&index=all&locale=en&query=SW_MATM-4-MACFLAP_NOTIF&counter=0&paging=5&links=reference&sa=Submit

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080136673.shtml

Best regards,
Andras


On Sun, Aug 7, 2011 at 7:14 PM, Farooq Razzaque <farooq_mcp at hotmail.com> 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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