Wireshark-bugs: [Wireshark-bugs] [Bug 7046] New: Enhancement to LDP dissector to support changes
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sun, 8 Apr 2012 20:59:16 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7046

           Summary: Enhancement to LDP dissector to support changes
                    proposed in RFC6391 - flow aware transport of PW over
                    an MPLS PSN
           Product: Wireshark
           Version: 1.6.8
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: arambadk@xxxxxxxx


Build Information:
TShark 1.2.15

Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (32-bit) with GLib 2.22.5, with libpcap 1.0.0, with libz 1.2.3,
without
POSIX capabilities, with libpcre 7.8, with SMI 0.4.8, without c-ares, without
ADNS, without Lua, with GnuTLS 2.8.5, with Gcrypt 1.4.5, with MIT Kerberos,
without GeoIP.

Running on Linux 2.6.32-220.4.2.el6.i686, with libpcap version 1.0.0, GnuTLS
2.8.5, Gcrypt 1.4.5.

Built using gcc 4.4.6 20110731 (Red Hat 4.4.6-3).

--
Abstract of the RFC:
---------------------------------------------------------------------------------
Where the payload of a pseudowire comprises a number of distinct flows, it can
be desirable to carry those flows over the Equal Cost Multiple Paths (ECMPs)
that exist in the packet switched network. Most forwarding engines are able to
generate a hash of the MPLS label stack and use this mechanism to balance MPLS
flows over ECMPs.

This document describes a method of identifying the flows, or flow groups,
within pseudowires such that Label Switching Routers can balance flows at a
finer granularity than individual pseudowires. The mechanism uses an additional
label in the MPLS label stack.
---------------------------------------------------------------------------------

We are making changes to the ldp dissector to parse the signalling sub-tlv and
the bottommost label (in this case the flow label).

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