Wireshark-bugs: [Wireshark-bugs] [Bug 10530] New: LLDP TIA TR Network Policy decode incorrect
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 06 Oct 2014 12:18:48 +0000
Bug ID 10530
Summary LLDP TIA TR Network Policy decode incorrect
Product Wireshark
Version 1.12.1
Hardware x86-64
OS Windows 7
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter n.langenberg@iolan.com 

Created attachment 13127 [details]
Capture of LLDP packet

Build Information:
Version 1.12.1 (v1.12.1-0-g01b65bf from master-1.12)
--
LLDP Decodes LLDP TIA TR-41 Committee Network Policy incorrect.

In my example (see attachment) the voice application type is:
80 00 00

Specification:

  //
---------------------------------------------------------------------------
  // | TLV     | LLDP    | Application | U | T | X | VLAN ID | L2     | DSCP  
|
  // | header  | MED     | type        |           |         | Prio   | value 
|
  // |         | header  |             |           |         |        |       
|
  //
---------------------------------------------------------------------------
  // | 2 bytes | 4 bytes | 1 byte      | 3 bits    | 12 bits | 3 bits | 6 bits
|

Wireshark decodes as:
U bit = 0
T bit = 0
X bit = 0
VLAN ID = 64
L2 Prio = 0
DSCP = 0

I think it has to be decoded as:
U bit = 1
T bit = 0
X bit = 0
VLAN ID = 0
L2 Prio = 0
DSCP = 0

Please verify

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