S4048-on L2 multicast traffic not passed through

Question

Hello, Community

I faced with multicast traffic passing issue on Dell S4048-ON switches.

How i understand from manuals all multicast traffic have to forwarded to all ports which represented in separate VLAN.

I have such topology of my network:

Dell N3048 (SwitchA) <-> Dell S4048 <-> Dell N3048(Switch B).

Multicast traffic, for example from switch A, couldn't reach Switch B. I checked that if generate multicast traffic on Switch A, i recieve multicast traffic on any ports of Switch A which is represented in separate VLAN.

Honestly, i have never faced with such issue, because switches forward multicast traffic in separate VLAN by default.

Anybody faced with such issue?

Thanks in advance!

g_kandasamy · Answer

If, S4048-ON is running OS10 (10.x.x.x) and it is L2 multicast traffic (ingress and egress VLAN are same), please try the below command on S4048-ON Dell(conf)#no multicast snooping flood-restrict

Ulvin10 · Answer

Hello, g_kandasamy Running version is 9.13. Also checked command, which you advised. No such command.

g_kandasamy · Answer

That is the OS10 specific command, and will not work on OS9 switches. Is the IGMP snooping enabled? #show ip igmp snooping interface vlan

Ulvin10 · Answer

IGMP Snooping is enabled

Here is result of command

Core_Switch#show ip igmp snooping interface vlan 100
Vlan 100 is up, line protocol is up
IGMP snooping version is 2
Inbound IGMP access group is not set
Interface IGMP group join rate limit is not set
IGMP snooping is enabled on interface
IGMP snooping query interval is 60 seconds
IGMP snooping querier timeout is 125 seconds
IGMP snooping last member query response interval is 1000 ms
IGMP snooping fast-leave is disabled on this interface
IGMP snooping querier is disabled on this interface
IGMP snooping querier state is : Non-Querier

zadm · Answer

Hello,
I have the same issue, multicast traffic is not forwarded even with the latest version of OS10

It has been working fine until we replaced the switch from cisco to dell

If someone can reply with some recommendation it will be appreciated

Regards

Dell- Maria J · Answer

Hello zadm,

I am sorry you faced with this issue. I've made a research and found this Knowledge Base article:

https://dell.to/3suVqyO

I hope troubleshooting steps, described in this article, help you to resolve an issue.

Please ask me if you have any questions.

MKS1234 · Answer

@zadm​ we had the same issue after replacing cisco with a Dell S4048 OS10. Turned out the default igmp version 3 was not compatible with our existing kit so had to add 'igmp version 2' to the vlan interface to get it to work.

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S4048-on L2 multicast traffic not passed through

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