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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