On Mon, 10 Apr 2000, Johannes Hennecke wrote:
>
>
> Hello,
>
> I don't want to report a bug of Ethereal, but I want to show you a new feature
> I've built in.
> Ethereal is able of decoding Spanning Tree BPDUs of normal bridges. For my
> purposes it is useful to decode also Spanning Tree BPDUs for cable modems
> working as bridges. These cable BPDUs are slightly different from the BPDUs of
> normal bridges.
>
> The SP-RFIv1.1-I03-991105 (Data-Over-Cable Service Interface Specifications)
> says (H.3 Page 174):
> The Data over Cable Spanning Tree algorithm and protocol is identical to that
> defined in [IEEE 802.1d], with the following exceptions:
> When transmitting Configuration Bridge Protocol Data Units (BPDUs), the Data
> over Cable Spanning Tree Multicast Address 01-E0-2F-00-00-03 is used rather than
> that defined in IEEE 802.1d (01-80-C2-00-00-00). ...
> When transmitting Configuration BPDUs, the SNAP header AA-AA-03-00-E0-2F-73-74
> is used rather than the LLC 42-42-03 header employed by 802.1d. ...
>
> My changes, documented by 'diff' are listed below.
Thanks! Your patch has been committed to CVS. I capitalized 'DOCSIS' in
the oui_vals description field and in the comments.
>
> My environment:
> Operating System and version: SuSE Linux 6.4 Kernel 2.2.14
> Version of GTK+: 1.2.7
> Version of Ethereal: 0.8.3
>
> Sincerely,
> Johannes Hennecke
>
> ____________________________________________________________
>
> Johannes Hennecke Broadband Communications
> ELSA AG Engineering Consumer Communications
> Sonnenweg 11 Phone: +49-(0)241-606-4779
> 52070 Aachen Fax: +49-(0)241-606-2099
> Germany EMail: johannes.hennecke@xxxxxxx
> ____________________________________________________________
>
>
> -------------------- made by diff for patch -----------------------------------
> diff /home/jhenneck/EtherealPatched/oui.h /home/jhenneck/EtherealOrginal/oui.h
> 33d32
> < #define OUI_CABLE_BPDU 0x00E02F /* for docsis cable modem
> spanning tree bpdu */
> diff /home/jhenneck/EtherealPatched/packet-llc.c
> /home/jhenneck/EtherealOrginal/packet-llc.c
> 179d178
> < { OUI_CABLE_BPDU, "Docsis Cable Spanning Tree" }, /* for docsis
> cable modem spanning tree bpdu */
> 408,416c407
> <
> < case OUI_CABLE_BPDU: /* for docsis cable modem spanning tree
> bpdu */
> < if (tree) {
> < proto_tree_add_item(llc_tree,
> < hf_llc_pid, offset+6, 2, etype);
> < }
> < dissect_bpdu(pd, offset+8, fd, tree);
> < break;
> <
> ---
> >
> -------------------------------------------------------------------------------
>
>
