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Segment Routing BGP Prefix-SID - not decoding

asked 2020-09-14 18:15:57 +0000

aaron gravatar image

updated 2020-09-14 20:45:21 +0000

Hi I'm using Wireshark 3.2.6

When I sniff BGP update messages carrying Segment routing BGP Prefix-SID, it shows a Red Highlighted line of decode and doesn't seem to properly render the BGP message.

When expanded, it shows as "Unknown BGP Prefix-SID TLV Type: 5" ... "Expert Info (Error/Protocol): Unknown BGP Prefix-SID TLV Type: 5"

Is there a version of Wireshark or an update or a certain setting that I should use in order to properly see the BGP Prefix-SID?

I have the decode hex info if it helps.

here the issue posted to gitlab... https://gitlab.com/wireshark/wireshar...

-Aaron [email protected]

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Currently supported:

/* draft-ietf-idr-bgp-prefix-sid */
#define BGP_PREFIX_SID_TLV_LABEL_INDEX     1
#define BGP_PREFIX_SID_TLV_IPV6_SID        2
#define BGP_PREFIX_SID_TLV_ORIGINATOR_SRGB 3

IANA BGP Prefix-SID TLV Types lists 5 as:

Value        Type              Reference 
5   SRv6 L3 Service [draft-ietf-bess-srv6-services-02]



Looks like there is a Wireshark issue open.

Chuckc gravatar imageChuckc ( 2020-09-14 18:36:47 +0000 )edit

Ok. 15915 is related but this topic should be handled by itself.

How to open an issue
Would help if you can also provide a packet capture.

Chuckc gravatar imageChuckc ( 2020-09-14 19:04:17 +0000 )edit

ok, i just tried and i get an upload message that says ">60 points required to upload files"

what's that all about?

aaron gravatar imageaaron ( 2020-09-14 19:14:38 +0000 )edit

I also see a previous issue of same or similar problem....

https://www.wireshark.org/lists/wires...

https://www.wireshark.org/lists/wires...

aaron gravatar imageaaron ( 2020-09-14 19:17:43 +0000 )edit

Those look like when the code was first added in 2016.
To get the IANA updates rolled in, open a New Issue on GitLab and attach the capture to it.

Chuckc gravatar imageChuckc ( 2020-09-14 19:22:57 +0000 )edit

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answered 2021-03-20 18:36:08 +0000

aaron gravatar image

...and for feedback/confirmation, yes this wireshark version is definitely correctly displaying BGP Prefix-SID, with relative Sub-TLVs (srv6 behavior, structure)

https://www.wireshark.org/download/au... executable.... Wireshark-win32-3.5.0rc0-1290-g9b3afa027833.exe

I'm using it on Win7

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Asked: 2020-09-14 18:15:57 +0000

Seen: 229 times

Last updated: Mar 20