Hello Everyone... We have the following setup.. 1 x XSM7224S-100AJS (M7300) running 9.0.1.42 acting as a Core2 x M4300-52G ProSAFE 48-port 1G and 2-port 10GBASE-T and 2-port 10G SFP+ acting as Access Basically some else deployed them and configured them up for multicasting and has since left the company. Now the Site that has going live one month back is reporting that the Multicast stops working after about 20 minutes and to fix it either they wait for 40 Seconds or just do a channel up and the multicast stream comes good again. I was looking at the config and trying to make sense of it. Basically the config is such... 1) Core (Routing) has IGMP & DVMRP enabled . PIM is disabled2) Core (Switching) has IGMP Snooping & IGMP Querier enabled 4) Access (Routing) has IGMP ,DVMRP & PIM is disabled3) Access (Switching) has IGMP Snooping & IGMP Querier enabled From the Symptoms it seems that Multicasting is working but something is causing the Stream to drop e.g. Timer timing out.I looked in the forums to see if I can see some working configurations for Multicast Settings for Netgear switches but could not find anything useful. Open to ideas on what I should be look at. Please bear with me as I am a UC engineer and this has been dumped in my lap. Regards,Mayank

Hi Hopchen, Apologies for the late reply... Bascially this is the update... Did everything recommended except the below item 3 as this option was not in my Core.. 3. Allow querier mode each VLAN.Switching > Multicast > IGMP Snooping > IGMP VLAN Configuration > Enable Proxy Querier mode for you VLANs here and click Apply. The site just confirmed that multicast is working fine now... :) One thing I should mention that when I changed the multicast protocol, my remote connection dropped out for about 30 seconds... But then it came good. Thanks you very much for your help on this... Regards,Mayank

Forum Discussion

mayank7489

Aspirant

Nov 03, 2017

Solved

Multicast stops working after about 20 minutes

Hello Everyone...

We have the following setup..

1 x XSM7224S-100AJS (M7300) running 9.0.1.42 acting as a Core

2 x M4300-52G ProSAFE 48-port 1G and 2-port 10GBASE-T and 2-port 10G SFP+ acting as Access

Basically some else deployed them and configured them up for multicasting and has since left the company.

Now the Site that has going live one month back is reporting that the Multicast stops working after about 20 minutes and to fix it either they wait for 40 Seconds or just do a channel up and the multicast stream comes good again.

I was looking at the config and trying to make sense of it. Basically the config is such...

1) Core (Routing) has IGMP & DVMRP enabled . PIM is disabled

2) Core (Switching) has IGMP Snooping & IGMP Querier enabled

4) Access (Routing) has IGMP ,DVMRP & PIM is disabled

3) Access (Switching) has IGMP Snooping & IGMP Querier enabled

From the Symptoms it seems that Multicasting is working but something is causing the Stream to drop e.g. Timer timing out.

I looked in the forums to see if I can see some working configurations for Multicast Settings for Netgear switches but could not find anything useful.

Open to ideas on what I should be look at.

Please bear with me as I am a UC engineer and this has been dumped in my lap.

Regards,

Mayank

Troubleshooting

mayank7489
Nov 29, 2017
Hi Hopchen,

Apologies for the late reply...

Bascially this is the update...

Did everything recommended except the below item 3 as this option was not in my Core..

3. Allow querier mode each VLAN.
Switching > Multicast > IGMP Snooping > IGMP VLAN Configuration > Enable Proxy Querier mode for you VLANs here and click Apply.

The site just confirmed that multicast is working fine now... :)

One thing I should mention that when I changed the multicast protocol, my remote connection dropped out for about 30 seconds... But then it came good.

Thanks you very much for your help on this...

Regards,
Mayank

13 Replies

Hopchen
Prodigy
Nov 07, 2017
Hey,

From what I understand, there is one routing hop in the network - your core switch. In that case, I would suggest to use PIM-DM instead. Also, the DVMRP config isn't quite right and that might be the issue. You only need mcast routing on the devices that is actually does the routing.

Second thing is the IGMP snooping querier being enabled on multiple switches. That is fine, but you need to make sure they are enabled for querier election mode then.

I have attached some documents to this thread. Download via this link:

http://files.netgear-support.com/go/?a=d&i=xTXv5kPxjA

Please have a read. These are home-made but they will explain it a bit more. The link will expire in 10 days.

So, my advise:
1. Turn off DVMRP on all switches.
2. Use PIM-DM on just the routing core.
3. Review IGMP snooping setup according to my document. You might not need to change anything here.

Any questions, let me know!

Cheers
- mayank7489
  Aspirant
  Nov 08, 2017
  Hi Hopchen,
  
  Thanks for replying. much appreciated.
  
  Let me digest and get back to you.
  
  Regards.
- mayank7489
  Aspirant
  Nov 14, 2017
  Hi Hopchen,
  
  I seem to be having issue accessing your files.
  
  Could you please attach again if possible.
  
  Regards,
  - Hopchen
    Prodigy
    Nov 14, 2017
    Hi,
    
    I just tested and the link should still be fine. Just copy/paste this URL into your browser:
    
    http://files.netgear-support.com/go/?a=d&i=xTXv5kPxjA
    
    Does it still not work?
    
    Cheers