A while ago I described the need for BPDU guard in hypervisor switches, and not surprisingly got a number of “it’s there” tweets seconds after vSphere 5.1 (which includes BPDU filter) was launched. Rickard Nobel also did a magnificent job of replicating the problem my blog post is describing and verifying vSphere 5.1 stops a BPDU denial-of-service attack.
Unfortunately, BPDU filter is not the same feature as BPDU guard. Here’s why.
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