Avoid Looping Issue

Unanswered Question
Oct 13th, 2009
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Edge Switches are connected to BackBone-SW as trunk. Interfaces on EDGE switches are with portfast.

How to avoid looping concerns and disable interface if user connects hub,switch,router to ports on Edge-SW.

Backbone switch Cisco 4506

Edge switch cisco 2960

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Jason Fraioli Tue, 10/13/2009 - 09:43
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This may be what you are looking for on your portfast interfaces.

spanning-tree portfast bpduguard default

edit: BPDUGuard will shut down the interface, and you can use the following commands the auto-recover the interface.

errdisable recovery cause bpduguard

errdisable recovery interval 180

nasr.khan Tue, 10/13/2009 - 10:47
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Do I need to configure any commands on Backbone-SW.

What is ideal "MSTP Akka PVST" in my scenario.

One BackBone-Sw with 12 Edge-SW connected via SFP as trunk ports.

We have 45 Vlans including Voice/Data Vlans.

where does VTP Pruning fits??

Where does BpduFilter fits??


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