SG350 IGMP QUERIER

[jeremyczaicki]

Bonjour, 

actuellement j'ai un problème avec la série sg350. j'ai plusieurs VLAN, j'active bien l'igmp comme il se doit mais l'election auto du querier ne marche pas (enfin si mais que dans le vlan 1). l'adresse du querier affiche tout le temps 255.255.255.255.

Je ne comprends pas car sur un sg300 l'election est immédiate et c'est le meme querier sur tous les vlan. avez-vous une solution ? 

[marce1000]

           Vérifiez les paramètres IGMP sur votre appareil conformément à ce document

 https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-350-series-managed-switches/smb5292-igmp-snooping-on-the-sg350-and-sg550.html

 M.

[jeremyczaicki]

i know this, but if there is no interface into vlan, querier cannot find the one who leads...

[HamzaSZuberi]

Could this be occuring because your routers aren't on the same network segment? From what I understand, they should reside on the same segment for them to be elected. They must be querying from outside the subnet hence the broadcast source shown.

[jeremyczaicki]

I only have a SG350 or two with 4 vlan. they are used in a local network without internet connection. no routing used. when i enable IGMP querier en IGMP snooping, no querier is found. Querier address show me 255.255.255.255. The only way to get a querier is to add an interface into each vlan. But i do not understand why since with SG300 it is not needed ?

Thanks

[Zed969]

This isn't really specifically helpful other than it might help confirm
that there is something flaky about the implementation of the IGMP
Querier on this switch.

I recently took some training from Crestron re their NVX multicast video
encoders & decoders. These depend on IGMP Snooping and having a querier
functioning correctly. There is a note on some lab documentation that Cisco
SG350s are not recommended to be used unless you confine your
implementation to a single switch because the behaviour of the Querier on
these switches is suspect. With just a single switch the querier is not
needed, so they're just saying it flat out doesn't work with NVXs.

I will be interested to know what the solution is... if any. Maybe fixed in
a future firmware release? That would only happen if there is
acknowledgement of a real-world issue to be fixed.

[HamzaSZuberi]

We have been working with an industrial leader implementing a multicast
solution here and they recommend SG350 (PoE models) so it definitely works
with multiple switches. Perhaps contacting Cisco SMB support would be the
quickest solution for you as this may be related to your specific product.

[HamzaSZuberi]

I'm not sure how you can expect any communication between different subnets
without IPs assigned to each VLAN and inter VLAN routing enabled.

[HamzaSZuberi]

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@jeremyczaicki wrote:
"The only way to get a querier is to add an interface into each vlan. But i do not understand why since with SG300 it is not needed ?"

Inter-vlan routing must have been enabled on the SG300