hello guys,
I'm testing the release 12.2 (55) a switch cisco 2960 POE48, and I was doing a test of the loop and found something funny:
when I connect to two phones cisco on the switch and then connect a phone to the other through a hub, switch, do not send the door to down, but keep on saying:
000065: *Mar 1 00:10:31.100 PT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/11, changed state to up
000066: *Mar 1 00:10:32.115 PT: %LINK-3-UPDOWN: Interface FastEthernet0/13, changed state to up
000067: *Mar 1 00:10:33.121 PT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/13, changed state to up
000068: *Mar 1 00:11:48.803 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 6416.8d51.8154 in vlan 40 is flapping between port Fa0/13 and port Fa0/11
000069: *Mar 1 00:11:54.633 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 0023.339c.4cd8 in vlan 40 is flapping between port Fa0/11 and port Fa0/13
000070: *Mar 1 00:12:48.799 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 6416.8d51.8154 in vlan 40 is flapping between port Fa0/11 and port Fa0/13
000071: *Mar 1 00:12:50.728 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 0023.339c.4cd8 in vlan 40 is flapping between port Fa0/11 and port Fa0/13
000072: *Mar 1 00:13:02.724 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 0023.339c.4cd8 in vlan 40 is flapping between port Fa0/11 and port Fa0/13
000073: *Mar 1 00:13:16.825 PT: %SW_MATM-4-MACFLAP_NOTIF: Host 0023.339c.4cd8 in vlan 40 is flapping between port Fa0/11 and port Fa0/13
if I connect a phone cisco and siemens to the switch and then connect the cisco to siemens through a hub, the switch detects the loop and already sends door below to shutdown :
000077: *Mar 1 00:13:59.322 PT: %ILPOWER-7-DETECT: Interface Fa0/13: Power Device detected: IEEE PD
000078: *Mar 1 00:14:00.328 PT: %ILPOWER-5-POWER_GRANTED: Interface Fa0/13: Power granted
000079: *Mar 1 00:14:03.130 PT: %LINK-3-UPDOWN: Interface FastEthernet0/13, changed state to up
000080: *Mar 1 00:14:04.137 PT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/13, changed state to up
000081: *Mar 1 00:14:10.864 PT: %SPANTREE-2-BLOCK_BPDUGUARD_VP: Received BPDU on port Fa0/11, vlan 22 with BPDU Guard enabled. Disabling vlan.
000082: *Mar 1 00:14:10.864 PT: %PM-4-ERR_DISABLE_VP: bpduguard error detected on Fa0/11, vlan 22. Putting in err-disable state.
000083: *Mar 1 00:14:10.864 PT: %SPANTREE-2-BLOCK_BPDUGUARD_VP: Received BPDU on port Fa0/11, vlan 40 with BPDU Guard enabled. Disabling vlan.
000084: *Mar 1 00:14:10.864 PT: %PM-4-ERR_DISABLE_VP: bpduguard error detected on Fa0/11, vlan 40. Putting in err-disable state.
ports configuration is as follows:
interface FastEthernet0/11
switchport access vlan 22
switchport mode access
switchport voice vlan 40
spanning-tree portfast
spanning-tree bpduguard enable
spanning-tree guard loop
end
how can I fix this?
