Need to increase TWAMP MBZ integer to 2 Bytes

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twamp.test.mbz1 MBZ Unsigned integer (1 byte)

Is there any way to edit this filter to support 2 byte field? Routers will insert values greater than 255.

brebelo

asked 2023-01-23 18:23:16 +0000

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On Cisco routers, MBZ field is 16 bits

brebelo (2023-01-23 20:35:33 +0000) edit

"MBZ" stands for "Must Be Zero"; the only value an MBZ value can have is zero (which is less than 255...), so either this field is not an MBZ field, and its value may have some significance, or those routers have buggy firmware/oftware.

Guy Harris (2023-01-24 07:22:59 +0000) edit

MBZ needs to be corrected and reworded to Session ID. I suppose this is an interpretation of Wireshark which is not correct.

brebelo (2023-01-24 16:39:27 +0000) edit

RFC 5357 shows the fields as MBZ.

Chuckc (2023-01-24 16:42:43 +0000) edit

In Cisco's implementation, the MBZ field is the Session-ID. Without it, the control plane would not be able to differentiate between sessions. All TWAMP sessions originated in the router use the same UDP socket.

I can let the MIG BU know about this RFC discrepancy and get their feedback.

brebelo (2023-01-24 17:09:31 +0000) edit

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Need to increase TWAMP MBZ integer to 2 Bytes edit

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