Multicast at 1000 Mbits/s works, but 100 Mbts/s don't.

[Paris]

Hello community, I have a
problem while I'm uploading an image with my fog server: multicast works well with my X440 switches (1000 Mbits/s) but with my x250 (100 Mbits/s) it stops after ~5min. It resumes when I restart all my ports concerned by my deployment: (my fog server and PCs).

When it stops, my PC unsubscribe to the udpcast group and resuscribe when I restart my ports.

I have the same issue when i configure my X440 PC ports at 100Mbits/s.

There is nothing in my logs that says that's my ports are blocked or somethings...

What do you suggest me to check ?


Thanks!

Best regards,
Adrien, from France.

[Paris]

Actually it is the age of the hosts that causes the exclusion of groups (when it's higher than 260 seconds)
I do not know the risks of increasing this timeout accross of my network, what is the way for my hosts to "re-subscribe" in order to make reset this timer/age ? Is it on the switch or on my deployment server in your opinion?
Thank you for your help.

[OscarK]

yes, show igmp snooping you will see senders and subscribers and the timers/age.

[Paris]

Yes it can be a temporary solution, the table is not full but is there a solution to check the snooping entry times ? is it "the age" ?

[OscarK]

Hi,igmp snooping on other switches play a role also. Disabling igmp snooping is a temporary solution, better is to investigate why the snooping entry times out or if a table is full (that would be logged).

[Paris]

Thank you for your answer, it works (1000Mb or 100Mb) when i disable igmp snooping in the concerned Vlan but only if my Fog server and my PC (to deploy) are on the same switch.
it doesn't when i go trought my network.