March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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For spanning tree debugging, the best thing is to get the data from a direct connection to the LAN switches. A well-configured SNMP trap to a management system can also assist in this task.
Some examples of STP packets are as follows:
In the following screenshot, you can see an STP frame. You can see that the source MAC address is a Nortel address, and in the BPDU itself, the root and the bridge identifiers are equal; this is because the bridge that sends the packet is the root. The port ID is 8003, which in Nortel switches indicates port number 3.
Figure 8.11: Spanning tree BPDU from a root switch
In the following screenshot, ...
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