May I know when we would get the ISIS Flood reflector decoding capability (ISIS packet encapsulated in UDP) in wireshark?

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UDP encapsulated Flood reflector packets are not decoded by wireshark.

Is there a specification for the form of encapsulation? Juniper has some documents that seem to indicate that they have something called "flexible tunnel interfaces" in which IPv4, IPv6, OSI, and other protocols can be encapsulated over UDP, which would support encapsulating IS-IS packets, but they don't document the form of encapsulation anywhere that I could find.

Without that specification, there's nothing we can do, other than try to reverse-engineer the format from a sample capture, which is why Jaap mentioned the sample capture.

Feature development, like this dissector extension, is driven by volunteer effort, so the answer is: whenever someone feels like it and can spend time on it. There's no set roadmap for it.

Still, there are various ways to help this development along:

1. Develop the code contribution yourself
2. Provide a sample capture file in an issue describing your request in as much detail as possible