M4300 IGMP snooping

[Hypestar]

Hello,

i have problems with configuring IGMP Snooping on my Netgear M4300 switch. 

Heres a link with pictures of my current configuration: https://imgur.com/a/N3UaYIK

All devices are in VLAN10. My Router is a Fritz!Box 6490 Cable (192.168.10.1).

VLAN10 Management IP is 192.168.10.250

Everytime i start my IPTV Streaming Server my AccessPoints reach 80-90% load even with this configuration.

Does anyone have any ideas on what I did wrong?

Thank you!

Regards

[VistaICT · Accepted solution]

Hi All,

We have worked out the issue with Netgear Support. Turns out the Bonjour service is disrupting MDNS between the TX and RX.

Disabling the bonjour service fixed it.

[VistaICT]

Our multicast broke today after upgrading to firmware 12.0.7.7, downgrading to 12.0.4.9 resumed normal multicast functionality.

Also noticed the 'snoopTask' process was consuming 99% CPU on all versions higher than 12.0.4.9

[BretD]

Thanks for bringing this to our attention. I've reached out to the support and engineering team to investigate immediately. 

[atian]

Could you provide the following:

1) network topology including the router, IPTV

2) go to the maintanence->export->HTTP file export, select 'techsupport file' and click the apply button.

3) capture the packets on the port connected to the IPTV Streaming server.

[VistaICT]

I have opened case #40496719 with support regarding this issue. For those interested I have done a basic test of both firmware versions (12.0.4.9 & 12.0.7.7)

1) boot switch using firmware to test

2) erase startup-config

3) reboot switch

4) increase MTU on interfaces 1/0/1 & 1/0/2 where my multicast devices are attached

5) check MFDB

On the 12.0.7.7 firmware my multicast receiver does not join the group. On 12.0.4.9 it does.

[VistaICT]

Here is a diff showing the tech-support for 12.0.4.9 (left) and 12.0.7.7 (right)

[atian]

what's the multicast IP address? could you provide a captured packets?

[VistaICT]

Here's some PCAPs using different firmware 12.0.4.9 and 12.0.7.7: https://ufile.io/vwnha (can't upload them here)

This was done on a stack of M4300-52G-POE switches and includes a TechSupport dump

The switches are always in factory configuration

I have also tested firmware 12.0.7.8 today and the problem still exists.

You'll notice in the 12.0.7.7 the receiver is sending MDNS queries to 224.0.0.251 but never sees a response. In 12.0.4.9 the response is seen followed by a peer-to-peer TCP negotiation of metadata/keys and then video traffic starts flowing.

169.254.3.3 is the transmitter

169.254.6.7 is the receiver

225.0.100.3 is the multicast group the transmitter is sending traffic to and the receiver is trying to join

[VistaICT · Accepted solution]

Hi All,

We have worked out the issue with Netgear Support. Turns out the Bonjour service is disrupting MDNS between the TX and RX.

Disabling the bonjour service fixed it.

[LaurentMa]

Hi @VistaICT

Thank you for confirming the resolution of your issue. 

For others in the Community, here are the explanations for disabling Bonjour, in case of a conflict between IGMP and mDNS packets. 

• Using the  Web GUI:

Disable Bonjour on M4300

1. Navigate to System > Management > Bonjour > Bonjour Configuration.
2. Set Admin Mode to Disable.
3. Click the blue Apply button.

• Using the M4300 CLI:

User:admin
Password:
(M4300-switch) >en

(M4300-switch) #configure
(M4300-switch) #no bonjour run
exit

Regards,