prevent-bridging-loops-without-bpdus.html

---
url: /2012/01/prevent-bridging-loops-without-bpdus/
title: "Prevent bridging loops without BPDUs?"
date: "2012-01-04T08:21:00.003+01:00"
tags: [ bridging ]
---

<p>Anton sent me an interesting question:</p>
<blockquoteclass="cite">Most IP phones have a network facing port and a port for user to connect the PC. Today a user plugged in both of these ports into the switch. It looks like phone filters out BPDUs, so the switch did not catch this loop. Do you know of a feature or design that would be able to catch/prevent this type of event?</blockquote>
<p>My answer would be “no, there’s nothing you can do if you have a broken device that acts like a STP-less switch” but you know I’m not a switching or IP telephony guru. Any ideas?</p>