https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7487
Summary: BPDU dissector enhancement to recognize Cisco's
VLAN-bridge BPDUs
Product: Wireshark
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: Enhancement
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: peter.paluch@xxxxxxxxxxxx
Created attachment 8783
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8783
Patch against packet-bpdu.c to recognize VLAN-bridge STP
Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
Greetings,
When software or fallback bridging is configured on Cisco devices, one of the
STP variants that can be selected to run in the particular bridge-group is what
Cisco calls VLAN-bridge. This STP variant uses SNAP encapsulation with the
following data:
- Destination MAC: 01:00:0c:cd:cd:ce
- SNAP OUI: 0x00000c
- SNAP PID: 0x010c
Information about this VLAN-bridge protocol are sadly quite rare but some info
about the idea behind it and some technical details are described here:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800a7af6.shtml#rec_use
BPDUs carried inside these VLAN-bridge frames are 802.1D STP-compliant BPDUs
without any modifications that can be dissected and analyzed by the existing
BPDU dissector. However, Wireshark currently does not recognize the SNAP PID
0x010c and does not pass these BPDUs to the existing BPDU dissector.
The attached patch adds the SNAP PID 0x010c among the list of PIDs passed to
the BPDU dissector.
I would like to ask you to kindly review this (basically one-line-long) patch
and consider it for including into Wireshark codebase.
Thank you!
Best regards,
Peter
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