mac flap

[Manish Manwal]

hey everyone.

once again i have a new problem , that our switches have show log that mac flap on multiple interfaces.

in switches spanning-tree in enable.

: spanning-tree mode rapid-pvst
spanning-tree portfast default

we already found that there is no loop in our network. if somehow there is loop, then why stp is not block that one.

what is the mean of mac flap? is loop or anything else?

[Leo Laohoo]

MAC address of a particular device is showing up from two (or more) interfaces.

[Manish Manwal]

yes.

%SW_MATM-4-MACFLAP_NOTIF: Host 4c34.8801.08ab in vlan 1 is flapping between port Te1/0/21 and port Te1/0/22

[paul driver]

Hello

Do you have wifi network? this could just be a user roaming from one ap to another and its mac address being seen on another port that these aps are attached to.

res

Paul

[Manish Manwal]

yes mr paul driver; we have more then 20 AP. but i have already check that things.

that mac who is flap between interface in our server mac, and server is connected trough LAN.

and there is no loop between them.

[cofee]

Does this server have 2 upstream connection to two separate switches? if so,  please check with the server team that they don't have nic bonding configured to run both interfaces as active/active instead of active/standby unless your switches are configured as a cluster.

[Manish Manwal]

no mr cofee that server not having multiple upstream.
there or mote then 20 to 30 mac who have flap between interfaces. multiple switches, multiple location and multiple mac's.