eva_es
1 Copper

N2000 IGMP snooping filtering

I have a Dell N2024 switch connected to a headend that provides with multicast streams. The Dell switch is layer 2 only. The problem I have is that the multicast traffic is not being correctly filtered by the switch.


I am only working with vlan 1 and the dell switch is configured as querier. The configuration is all by default except:

>>ip igmp snooping querier
>>ip igmp snooping querier address <address of mgmt IP of switch>
>>ip igmp snooping querier vlan 1
>>ip igmp snooping querier address <address of mgmt IP of switch>
>>ip igmp snooping querier election participate 1


The switch is acting as querier  (igmp packets are send and it is shown in the status of the switch) but when I connect a PC all the multicast traffic is received.


How I can configure the switch to filter the multicast traffic without adding static multicast addresses?

eva_es

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6 Replies
Anonymous
Not applicable

RE: N2000 IGMP snooping filtering

To clarify, multicast traffic is being flooded out all interfaces regardless of the client joining? Might check that igmp snooping is enabled.

console(config)#show ip igmp snooping

If IGMP snooping is disabled, multicast data plane packets are flooded in the VLAN.

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eva_es
1 Copper

RE: N2000 IGMP snooping filtering

To clarify, multicast traffic is being flooded out all interfaces regardless of the client joining? Might check that igmp snooping is enabled.

console(config)#show ip igmp snooping

If IGMP snooping is disabled, multicast data plane packets are flooded in the VLAN.


Yes, the multicast traffic is being flooded out regardless os the client joining.


IGMP snooping is enable (it is enable by default in these switch).

console(config)#show ip igmp snooping

Admin Mode..................................... Enable
IGMP Router-Alert check........................ Enabled
Multicast Control Frame Count.................. 160
SSM FDB Capacity............................... 512
SSM FDB Current Entries........................ 0
SSM FDB High Water Mark........................ 0
Flooding Unregistered to All Ports............. Disabled

Vlan 1:
--------
IGMP Snooping Admin Mode....................... Enabled
Immediate Leave Mode........................... Disabled
Group Membership Interval...................... 260
Last Member Query Interval..................... 10
Multicast Router Expiry Time................... 300
Report Suppression Mode........................ Enabled

eva_es

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Anonymous
Not applicable

RE: N2000 IGMP snooping filtering

I found this KB article that looks to fit the this scenario. I would test this out and see if helps any.

http://dell.to/1N07E6d

Keep us posted.

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vt1012
3 Argentium

RE: N2000 IGMP snooping filtering

Hello!  

You may also want to run the "show ip igmp snooping mrouter" on the IGMP snooping switch to show that the port knows where the server is.  If set correctly it will show the port entry for IGMP snooping. Here is a guide for setting up IGMP multicast that has an example that may be of help.

en.community.dell.com/.../20337477

Hope this helps.

-B

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eva_es
1 Copper

RE: N2000 IGMP snooping filtering

Thank you for the information.

I have tried this out and it works. However, this is not the solution that I am after since the switch should be able to filter the multicast traffic without having to lose a port.

eva_es

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Highlighted
eva_es
1 Copper

RE: N2000 IGMP snooping filtering

Hi,

The show ip igmp snooping mrouter doesn't give any port.

Remember that the only devices that is sending IGMP queries is the switch since it is the querier.

Thanks for the document but the firmware is 6.1.0.6 and not 5.1

eva_es

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