MPLS Echo Packet containing FEC stack change Sub-TLV in DDMAP TLV is not decoded by wireshark or https://hpd.gasmi.net/

["max payne.." <pankaj.knitcs1 () gmail com>]

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
<https://datatracker.ietf.org/doc/html/rfc8029#section-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/ <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/
<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/ <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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