Wireshark-dev: Re: [Wireshark-dev] MPLS Echo Packet containing FEC stack change Sub-TLV in DDMA

From: Alexis La Goutte <alexis.lagoutte@xxxxxxxxx>
Date: Fri, 3 Dec 2021 20:23:36 +0100
Hi,

Can you open an issue on wireshark gitlab ? With pcap file and link to spec.

Cheers 
Le ven. 3 déc. 2021 à 17:26, max payne.. <pankaj.knitcs1@xxxxxxxxx> a écrit :
Hi,

This is to inform you that we are supporting FEC Stack Change Sub-TLV in DDMAP TLV. I have Hex Dump, which is correct as per my understanding but it is not getting decoded on Wireshark or Online Decoder.

Please let me know if the latest Wireshark  "Version 3.6.0 (v3.6.0-0-g3a34e44d02c9)" supports the following (RFC 8029  3.4.1.3. FEC Stack Change Sub-TLV) :-
1) Multiple FEC stack change sub-TLV in DDMap TLV, whereas single FEC stack change TLV is decoded properly. Please find the HEX dump below.
2) FEC stack change sub-TLV along with FEC stack sub-TLV in DDMap TLV is not decoded properly. Please find the HEX dump below.

I am having following HEX Dump, which is not getting decoded properly on wireshark or online decoder "https://hpd.gasmi.net/"


Two  FEC stack Sub-TLV in DDMAP TLV not decoded properly on wireshark or on https://hpd.gasmi.net/
Ethernet:   18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
08 00

IP: 45 00
IP Len: 00 68
71 a5 00 00 ff 11 29 a4 07 07
07 07 09 09 09 09

UDP: 0d af 0d af
UPD Len: 00 54
a8 b1

ECHO: 00 01
00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c

DDMAP: 00 14 00 28
05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
SUB-Len: 00 18
             
Stack-chg Type: 00 03 00 08
Value : 02 01 00 00
06 06 06 06

Stack-chg Type: 00 03 00 08
Value : 02 01 00 00
07 07 07 07

FEC stack change sub-TLV with FEC sub-TLV (IGP IPV4 Prefix Segment TLV) not decoded properly on wireshark or on https://hpd.gasmi.net/.

Ethernet:   18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
08 00

IP: 45 00
IP Len: 00 68
71 a5 00 00 ff 11 29 a4 07 07
07 07 09 09 09 09

UDP: 0d af 0d af
UPD Len: 00 54
a8 b1

ECHO: 00 01
00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c

DDMAP: 00 14 00 28
05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
SUB-Len: 00 18
             
Stack-chg Type: 00 03 00 08
Value : 02 01 0c 00
06 06 06 06

FEC TLV Type: 00 0e 00 08
Value : 01 01 01 01
 20 00 00 00

Whereas multiple Label-Stack sub-TLV in DDMap TLV is getting properly decoded on https://hpd.gasmi.net/
Ethernet: 18 92 a4 55 71 04 00 23 8a fb c2 04 81 00 00 d4
08 00

IP: 45 00
IP Len: 00 60
71 a5 00 00 ff 11 29 a4 07 07
07 07 09 09 09 09

UDP: 0d af 0d af
UPD Len: 00 4C
a8 b1

MPLS Echo: 00 01
00 00 02 02 08 02 00 00 00 16 00 00 00 03 e4 ae
50 eb 6f c5 47 9d e4 ae 50 eb 70 2a dc 4c

DDMAP: 00 14 00 20
05 dc 01 02 d2 01 01 01 d2 01 01 01 00 00
SUB-Len: 00 10
               
Label-S: 00 02 00 04
00 00 30 06

Label-S: 00 02 00 04
00 00 30 06


--
Pankaj Verma
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