enabling BPDU Guard on access ports connected to IP Phones

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Aug 19th, 2008
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I was looking for some advice to see if it is recommended to configure BPDU Guard on ports connected to IP phones to prevent routing loops?

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Marwan ALshawi Tue, 08/19/2008 - 21:57
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why u expect routing loop from a port connected to a phone?

anyway u can do it

good luck

andypearce33 Wed, 08/20/2008 - 21:56
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My main concern regarding rooting loops is that we have a PC connected to the data port on the phone. I am concerned that if this is invertible connected to another switch (say accidently patched incorrectly) would this cause a loop?

Rob Huffman Wed, 08/20/2008 - 04:59
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Hi Andy,

I just thought that I would add this link to the good info from my friend Marwan. It's a pretty good read :) (well not not Mark Twain ....but)

Root guard or BPDU guard

Enable root guard or BPDU guard on all access ports to prevent the introduction of a rogue switch

that might attempt to become the Spanning Tree root, thereby causing STP re-convergence events

and potentially interrupting network traffic flows. Ports that are set to errdisable state by BPDU

guard must either be re-enabled manually or the switch must be configured to re-enable ports

automatically from the errdisable state after a configured period of time.

From this CCM SRND doc;

Cisco Unified Communications SRND Based on Cisco Unified CallManager 4.x

Network Infrastructure


Hope this helps!


Marwan ALshawi Wed, 08/20/2008 - 05:44
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thank you Rob for this nice comment, i really appreciate it :)


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