Ask Your Question

ESMC - extended QL TLV

asked 2020-01-10 10:04:06 +0000

Argus gravatar image


According G.8264/Y.1364 if a clock in an option 1 network supports both the QL TLV and the extended QL TLV, it should set the SSM code and the enhanced SSM code according, and send both the QL TLV and the extended QL TLV. Both TLVs shall be sent in one ESMC PDU.

In wireshark QL TLV is ok. TLV Type, TLV length and SSM Code are as expected.

But I'm having a problem with extended QL TLV saying that Timestamp is invalid?!

Accoring to this table from G.8264 4. octat number of extended QL TLV should represent enhanced ssm code which is in this case 20, but as you can see from first picture that octate (and 3 more following) are assigned to Timestamp!?

Does someone knows is Wireshark supporting extended QL TLV, or the problem is in something else?

Link to a .pcap file:

Best regards

edit retag flag offensive close merge delete

The length is hard coded:


And looks like it has been a while since last worked on:

Chuckc gravatar imageChuckc ( 2020-01-10 17:39:56 +0000 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2020-01-10 18:05:28 +0000

Jaap gravatar image

This warrants a bug report here. Please attach the capture file to the bug as well.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


Asked: 2020-01-10 10:04:06 +0000

Seen: 156 times

Last updated: Jan 10 '20