Title: Reggle's Blog-Tracing unexpected BPDU packets in a LAN.
Post by: Reggle on March 01, 2016, 08:24:02 AM
Post by: Reggle on 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. (https://reggle.wordpress.com/2014/05/06/tracing-unexpected-bpdu-packets-in-a-lan/)
From https://reggle.wordpress.com/
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. (https://reggle.wordpress.com/2014/05/06/tracing-unexpected-bpdu-packets-in-a-lan/)
From https://reggle.wordpress.com/
Title: Re: Reggle's Blog-Tracing unexpected BPDU packets in a LAN.
Post by: deanwebb on March 01, 2016, 08:23:56 PM
Post by: deanwebb on March 01, 2016, 08:23:56 PM
Makes a great case for turning on BPDU Guard on all your access ports.