Dear All,
I am facing a network connectivity issue in my internal network. More than 20 users are getting RTO in our inside network. When I checked the the core switch i got an error regarding MAC flapping issue. But I am little bit confused that every MAC address learned from WLC which is connected to my core switch(3750) on G0/15. when I checked the connectivity the MAC address are belongs to the physical PC but I don't understand why the same MAC address is learned through WLC also as I have already disable the wireless driver of the PC. Every MAC address learn through WLC as well as switch(2960) which is connected to core switch. Please find below error...
001126: Jul 29 05:10:07: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001127: Jul 29 05:15:39: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server
pinged 172.28.0.248.
001128: Jul 29 05:20:21: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001129: Jul 29 05:21:22: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001130: Jul 29 05:25:10: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/1 and port Gi0/15
001131: Jul 29 05:31:36: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001132: Jul 29 05:35:11: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001133: Jul 29 05:35:17: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001134: Jul 29 05:41:39: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001135: Jul 29 05:43:17: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server
pinged 172.28.0.253.
001136: Jul 29 05:45:12: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001137: Jul 29 05:45:28: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001138: Jul 29 05:45:44: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001139: Jul 29 05:46:02: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001140: Jul 29 05:47:38: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server
pinged 172.28.1.1.
001141: Jul 29 05:51:50: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/6 and port Gi0/15
001142: Jul 29 05:55:16: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001143: Jul 29 05:55:31: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001144: Jul 29 05:57:52: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001145: Jul 29 06:00:36: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001146: Jul 29 06:01:50: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001147: Jul 29 06:02:39: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001148: Jul 29 06:03:11: %SW_MATM-4-MACFLAP_NOTIF: Host d067.e518.1fdf in vlan 1
00 is flapping between port Gi0/15 and port Gi0/6
001149: Jul 29 06:05:19: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
001150: Jul 29 06:06:02: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9bd.2dd3 in vlan 1
00 is flapping between port Gi0/15 and port Gi0/1
Please somebody help me why is happening like this??????????
Regards,
Sanjib Pradhan
