11-06-2012 03:23 AM - edited 03-07-2019 09:53 AM
Hello,
I have the following configuration on my access layer switch.
interface FastEthernet0/1 - 20
switchport access vlan 4
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
But when i plug in a netgear hub into one of the user ports it didnt err-disable the port.
I need this to stop users plugging in a hub onto our network so they have extra access ports.
Any ideas why the bpduguard did not work.
thanks
Kevin
Solved! Go to Solution.
11-06-2012 04:14 AM
Hi,
For this situation you can use
#switchport port-security
#switchport port-security max address 3 (for example)
#switchport port-security mac address sticky
To allow only three PCs to be connected from hub.
Sent from Cisco Technical Support iPhone App
11-06-2012 04:14 AM
Hi,
For this situation you can use
#switchport port-security
#switchport port-security max address 3 (for example)
#switchport port-security mac address sticky
To allow only three PCs to be connected from hub.
Sent from Cisco Technical Support iPhone App
11-06-2012 05:02 AM
Yeah - port security is a fall back option.
Enabling bpduguard on client facing ports will err-disable the switchport if it receives a bpdu from a connected device. But BPDUs are sent by switches so old hubs won't send bpdus. For this reason i dont think its possible to err-disable a hub using bpduguard enable
thanks
Kevin
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