04-18-2009 10:23 AM
I have enabled bpduguard to disable the port automatically whenever host flap issue occurs. And have found BPDU-Guard to be very effective. But it's not working in some times. Any ideas? Thanks in advance.
04-18-2009 11:15 AM
bpduguard should be configured on a switch that has ports configured as "portfast" if none of the ports are configured for portfast, the switch will go thru the listening,learning,forwarding or blocking if the switch port recevies a BPDU.
HTH>
04-18-2009 12:13 PM
yes, i have configured spanning-tree portfast in all access ports.
configuration:
(config)# spanning-tree portfast bpduguard default
(config-if)#spanning-tree portfast
the ports will be disbled whenever the hostflap issue occurs. but some times its not working.
04-18-2009 12:36 PM
BPDUGuard has absolutely nothing to do with ports flapping, you need to look into the err-disable settings.
04-18-2009 12:58 PM
not portflapping. i am talking about host\vlan flapping
04-18-2009 01:26 PM
vlan flapping is handled by spanning-tree
diretcly connected host flapping can only be managed by port flapping.
What exactly is your issue?
04-18-2009 01:50 PM
i like to disable the switch port automatically whenever physical loop occurs.
04-18-2009 11:36 PM
You need to configure loopguard:-
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094640.shtml#loop_guard
HTH>
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