Reggle's Blog-Tracing unexpected BPDU packets in a LAN.

Started by Reggle, March 01, 2016, 08:24:02 AM

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Reggle

March 01, 2016, 08:24:02 AM
Tracing unexpected BPDU packets in a LAN.

Disclaimer: the logs are taken from a production network but the values (VLAN ID, names) are randomized. Recently, I encountered an issue on a Campus LAN while performing routine checks: spanning tree seemed to undergo regular changes. The LAN in question uses five VLANs and RPVST+, a Cisco-only LAN. At first sight there was no […]
Source: Tracing unexpected BPDU packets in a LAN.

From https://reggle.wordpress.com/

deanwebb

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March 01, 2016, 08:23:56 PM
Makes a great case for turning on BPDU Guard on all your access ports.
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
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