Re: 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 Team,

I have not got the resolution for the issue below.

This was the link provided to me.
https://www.wireshark.org/mailman/confirm/wireshark
-dev/d4b89dd02f824a954e2e3ffa37151bf0f7ebacbc

On Fri, Dec 3, 2021 at 12:27 AM max payne.. <pankaj.knitcs1 () gmail com>
wrote:

> 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


-- 
Pankaj Verma

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