Ethereal-users: Re: [Ethereal-users] BPDU

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Fri, 9 Aug 2002 12:05:04 -0700
On Fri, Aug 09, 2002 at 08:23:38AM -0700, s s wrote:
> 19:40:04.040632 0:10:7b:81:cd:69 1:80:c2:0:0:0 0026 52: 802.1d ui/C > len=35
>                      0000 0000 0080 0000 107b 81cd 6900 0000
>                      0080 0000 107b 81cd 6980 0300 0014 0002
>                      000f 00

	...

> how can i find out BPDU root id bridge id etc? ANY FORMAT TO CHECK THAT?

By either

	1) using a newer version of tcpdump (newer versions dissect
	   802.1d BPDU packets);

	2) using Tethereal or Ethereal instead of tcpdump (they've
	   dissected BPDU packets for quite a while);

	3) using tcpdump with the "-w" option to save to a binary
	   capture file, and reading that capture file with Tethereal or
	   Ethereal or a newer version of tcpdump (but if you have any
	   of those programs, you might as well use them to do the
	   capturing).