Microsoft Windows IGMP V3 Join and Leave Group Record Type Query.

[michael.taylor]

Hello Everybody,

Whilst troubleshooting a customer multi-casting issue I have encountered an anomaly that I am having difficulty understanding.

I have two VLC playing laptops running Windows 7 and 10 on different networks trying to join a video broadcast across a ISR 4321 that includes an 8 port switch. Works perfectly with IGMP V2 but totally falls apart when updated to support IGMP V3.

The IGMP V3 join requests contains a Group Record Type "CHANGE_TO_EXCLUDE" listing the 239.0.0.1 group that I am trying to join.  Conversely, following VLC shutdown, the OS sends a IGMP V3 leave request containing a Group Record Type "CHANGE_TO_INCLUDE" listing the 239.0.0.1 group that I am trying to leave.

These symptoms were generated by Windows 7 and 10 endpoints running VLC version 3.0.8

I am at a loss o understand why the Join Group Record Type is not either "ALLOW_NEW_SOURCES" or "CHANGE_TO_INCLUDE"!

Suffice to say that my Microsoft Technet Forum submission is yet to attract a response.

[Georg Pauwen]

Hello,

this one is going to be hard to track. On the Windows machine, is Windows 7 configured for IGMPv3 ? If not, add a DWORD value to the registry as described below:

1.type “regedit” , then navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\

1.In the right pane, right-click and select New – DWORD (32-bit value) and set its name as “IGMPVersion” , set it with the value 4

You could also try and configure 'ip igmp v3lite' on the ISR...

[michael.taylor]

Evening All,

Following up on Georg’s reply, IGMP Snooping feedback confirms that Windows IGMP versions are consistent with the ISR.

I used a variation of the regedit tweak (IGMPVersion=3) to downgrade Windows to IGMP V2.