Problems with MVR enabled Summit X460 G2

[FrancescoP]

Hi we configured our switch with 2 VLANs.
The first VLAN called "internal" have some devices communicating.
On the switch's port 1 there is a computer that sends commands to the devices and take replies back.
The second VLAN called "external" have some external computers that can communicate with the computer on port 1, so the port 1 is tagged to belong to both VLANs.
On the internal VLAN we have some streaming devices that send Video in multicast. The video should arrive on the computers on the external VLAN.
To be able to see the video, we simply enabled MVR for the "Internal" VLAN:
configure mvr vlan internal
enable mvr
We are now able to see the video from external Vlan but we also have some problems in the internal VLAN, some devices doesn't work as expected, and the computer on port 1 read some error responses.

What could cause the problem?
If we disable the mvr, the errors are gone but we can't see the video from external Vlan as expected

[Erik_Auerswald]

Hi,

there may well be another problem: The GTAC Knowledge article https://about:blank describes a bug where multicast traffic is flooded in a VLAN if one router port is added to the VLAN. This issue (xos0064960) is supposed to be fixed in current EXOS version.

Thanks,
Erik

[Erik_Auerswald]

Hi,

static MVR does not rely on IGMP joins and bypasses IGMP snooping, see e.g. https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-Static-MVR-regardless-of-....

Thanks,
Erik

[Prashanth_KG]

Hi Francesco

thanks for your response.

While opening the VLC application could you check on the switch side if the port is subscribed to all groups .

Show igmp snooping vlan

it is possible that the igmp membership report is sent by the application making the switch port to subscribe to all groups .

[FrancescoP]

I tried with the congestion but i didn't see anything. I see instead an unexpected beheaviour.
I enabled Wireshark on port 6 of the switch, port 6 belongs to the "Internal" VLAN. I have also some streaming devices in the "Internal" VLAN that send video in multicast.

I don't see any traffic on port 6 and this is right since IGMP snooping is enabled and the port is not interested in the streaming, if i open VLC and open the multicast stream address, i see the multicast packets.
If i enable MVR, i suddently see all the video streaming on the port even if i'm not registered to any video stream! Why is this happening?

[Prashanth_KG]

Hi,

With all the multicast streams allowed between the vlans, there is a possibility that the port is congested with all the multicast traffic going out of the ports.

Please check for any congestion on the ports.

• show port congestion.