MAC ADDRESS is Flapping

[leandro roggerone]

After some changes on my network topoly , found the following message at console:

 %SW_MATM-4-MACFLAP_NOTIF: Host 7819.f7bd.e7f0 in vlan 2 is flapping between port Gi0/6 and port Po2

After that system goes very slow with %22 of paquet loss.
I know there is a layer2 loop somewhere.

So I have 2 questions:
1)I know that 7819.f7bd.e7f0 should go out on Po2,
Can I add an static entry at mac address table ? Would It eliminate the flapping ?
It is only temporal until I find the source problem.

and
2) 7819.f7bd.e7f0 has 3 Gateways Ips associated and each is also assigned to 3 different Vlan connecte through a trunk Po2 port. So Is it possible the add following 3 entries?

mac-address-table static 7819.f7bd.e7f0 vlan 2 interface ethernet Po2
mac-address-table static 7819.f7bd.e7f0 vlan 3 interface ethernet Po2
mac-address-table static 7819.f7bd.e7f0 vlan 4 interface ethernet Po2

[mahdymohamed]

It seems like the host is being seen by both interfaces, if you can share configuration related to both interfaces, it will be easier to check. 

I faced similar issue on GNS3, as the MAC is the same for the switch module, so i received the same error when 2 routers were connected to a switch. 

i guess the switch cannot learn the same MAC from three different interfaces (VLANs) this is related to your suggestion. 

[nehmaan123]

Trace the MAC address and find out what it is.

"show mac add | i 7819.f7bd.e7f0"

7819F7: Juniper Networks