https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=16313
Bug ID: 16313
Summary: BGP EVPN Extented community, ESI MPLS Label wrong
value
Product: Wireshark
Version: 3.2.0
Hardware: x86
OS: Windows 10
Status: UNCONFIRMED
Severity: Minor
Priority: Low
Component: Dissection engine (libwireshark)
Assignee: bugzilla-ad...@wireshark.org
Reporter: flavien.jolypot...@orange.com
Target Milestone: ---
Created attachment 17550
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=17550&action=edit
An example of the frame
Build Information:
3.2.0 (v3.2.0-0-ge0ed4cfa3d72)
Compiled (64-bit) with Qt 5.12.6, with WinPcap SDK (WpdPack) 4.1.2, with GLib
2.52.3, with zlib 1.2.11, with SMI 0.4.8, with c-ares 1.15.0, with Lua 5.2.4,
with GnuTLS 3.6.3 and PKCS #11 support, with Gcrypt 1.8.3, with MIT Kerberos,
with MaxMind DB resolver, with nghttp2 1.39.2, with brotli, with LZ4, with
Zstandard, with Snappy, with libxml2 2.9.9, with QtMultimedia, with AirPcap,
with SpeexDSP (using bundled resampler), with SBC, with SpanDSP, with bcg729.
Running on 64-bit Windows 10 (1709), build 16299, with Intel(R) Core(TM)
i5-8350U CPU @ 1.70GHz (with SSE4.2), with 8035 MB of physical memory, with
locale French_France.1252, with light display mode, without HiDPI, with Npcap
version 0.9984, based on libpcap version 1.9.1, with GnuTLS 3.6.3, with Gcrypt
1.8.3, with brotli 1.0.2, without AirPcap, binary plugins supported (19
loaded).
Built using Microsoft Visual Studio 2019 (VC++ 14.24, build 28314).
--
In the third BGP Update, within the Ext-Com part (ESI MPLS Label), the MPLS
Label is not dissected over the right length (only the 20th first bits of the 3
bytes are used for the MPLS Label information). The value should be 524200
instead of 8387200.
Frame 1: 369 bytes on wire (2952 bits), 369 bytes captured (2952 bits) on
interface \\.\pipe\mirror38N82-Data[2]_082ecfda92, id 0
Ethernet II, Src: Nokia_47:29:c8 (20:e0:9c:47:29:c8), Dst: Alcatel-_db:6b:22
(00:16:4d:db:6b:22)
Internet Protocol Version 4, Src: 172.20.23.194, Dst: 172.20.23.252
Transmission Control Protocol, Src Port: 179, Dst Port: 49931, Seq: 1, Ack: 1,
Len: 299
Border Gateway Protocol - UPDATE Message
Border Gateway Protocol - UPDATE Message
Border Gateway Protocol - UPDATE Message
Marker: ffffffffffffffffffffffffffffffff
Length: 103
Type: UPDATE Message (2)
Withdrawn Routes Length: 0
Total Path Attribute Length: 80
Path attributes
Path Attribute - MP_REACH_NLRI
Path Attribute - ORIGIN: IGP
Path Attribute - AS_PATH: empty
Path Attribute - MULTI_EXIT_DISC: 0
Path Attribute - LOCAL_PREF: 100
Path Attribute - EXTENDED_COMMUNITIES
Flags: 0xc0, Optional, Transitive, Complete
Type Code: EXTENDED_COMMUNITIES (16)
Length: 16
Carried extended communities: (2 communities)
Route Target: 65000:201 [Transitive 2-Octet AS-Specific]
ESI MPLS Label: Single-Active redundancy, Label: 8387200
[Transitive EVPN]
Type: Transitive EVPN (0x06)
Subtype (EVPN): ESI MPLS Label (0x01)
.... ...1 = Single active bit: Single-Active redundancy
MPLS Label: 8387200
--
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