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mivsek
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IP Multicast on v7

Fri Aug 19, 2022 11:55 am

Hi there,

I'm wondering what are the plans and a timetable for a stable IP Multicast (PIM SM) support on RouterOS v7? So far it seems only a static RP (with the RP on non v7 router) works reliably, while any effort with Bootstrap protocol ends up sooner or later in full CPU usage and reboot is needed. On RB4011.

Best regards
Janko
 
pe1chl
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Re: IP Multicast on v7

Fri Aug 19, 2022 2:55 pm

MikroTIk never announce timetables. "it is ready when it is ready" or "it is a work in progress".
And note, progress may be almost infinitesimally small and still be called progress.
 
tangent
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Re: IP Multicast on v7

Fri Aug 19, 2022 5:51 pm

any effort with Bootstrap protocol ends up sooner or later in full CPU usage and reboot is needed.

How long does it take to get into that state?

Why do you need automatic RP discovery? If there's only one path to the RP, and its IP rarely changes, if ever, static RP is not only perfectly fine, it's faster and more reliable.

Protocols like BSR and AutoRP are necessary only when your network topology keeps changing, as when you've got a multipath situation and you can never predict which leg will be available at any given moment.
 
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mivsek
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Re: IP Multicast on v7

Sat Aug 20, 2022 2:42 pm

any effort with Bootstrap protocol ends up sooner or later in full CPU usage and reboot is needed.
How long does it take to get into that state?
In a minute or two. Once I saw a looping message in a log, something about trouble parsing bootstrap messages. I can try to reproduce that If someone is interested.
Why do you need automatic RP discovery? If there's only one path to the RP, and its IP rarely changes, if ever, static RP is not only perfectly fine, it's faster and more reliable. Protocols like BSR and AutoRP are necessary only when your network topology keeps changing, as when you've got a multipath situation and you can never predict which leg will be available at any given moment.
Exactly that is the reason. For a case the network splits in two or more parts. Namelly, our case involves not only one source but every receiver is also a source of multicast (the amateur radio DMR repeater network). If the network splits, separate parts should continue to work separately and join when network comes back together. This is what Bootstrap protocol is there for and I'd like to use it with MikroTiks in our DMR network, where every router will be both a BSR and RP candidate.
 
tangent
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Re: IP Multicast on v7

Sat Aug 20, 2022 2:45 pm

With a reproducible test case that takes only a minute to complete, why are you messing around on the forum? Send it to MikroTik support. It’ll be Christmas in Latvia.

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