Wireshark-bugs: [Wireshark-bugs] [Bug 12934] CDP over GRE dissection request
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 22 Sep 2016 06:31:51 +0000

Comment # 2 on bug 12934 from 
(In reply to Alexis La Goutte from comment #1)
> Hi Garri,
> 
> There is a doc about Cisco CDP over GRE Packet ?

Hi Alexis,

The RFC2784 (GRE) [1] specifies that Protocol Type field is defined by
EtherTypes [2]. The value 0x2000 is reserved for private use. Cisco uses
private EtherType 0x2000 for CDP [3]. Thanks.


[1] https://tools.ietf.org/html/rfc2784
[2] http://standards-oui.ieee.org/ethertype/eth.txt
[3]
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/15-3-3-JB/configuration/guide/cg_book/cg-appA-protfilters.html

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