what can i do for next

Look at ypur topology..verify that you have no loop.

Massimiliano.

no loop in y topology

following error message shown in console

00:21:58: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/2 and port Gi1/0/13

00:22:17: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/3 and port Gi1/0/2

00:22:28: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/2 and port Gi1/0/13

00:22:47: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/3 and port Gi1/0/2

00:22:58: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/2 and port Gi1/0/13

00:23:17: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/3 and port Gi1/0/2

00:23:28: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/2 and port Gi1/0/13

00:23:47: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/3 and port Gi1/0/2

00:23:58: %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping be

tween port Gi1/0/2 and port Gi1/0/13

thnaks in advance

Dual-homed server perhaps?

i have eight servers with dual ethernet cards.outside interface of servers connected to separate network switch this switch connected to my firewall --> router --> outside world(internet),inside interface of servers connected to this 3750 switch and 3750 used for core switch of network.and also my network have a 6 No's of unmanageable switches.

Please help

regs

S.Mohana sundaram

Sundaram

The Mac address 0201.0000.0000 is the mac-address used by microsoft NLB.

Try disabling NLB on the servers and the error messasges will stop. If you need redundancy, it is better to do LACP

Narayan