Switch 9200L

[Milo25]

Hello 

Two vlan (vlan 111 and vlan 112) with different multicast and UDP are ingress on cisco switch 9200L on port 1 (trunk) and egress on two different port connected to decoder as access vlan 111 (port 3-access) and vlan 112 (Port 4 - access). it is observed that the stream vlan 112 ONLY when decoded has artifacts (video mosaic).

Kindly advise for any solution 

Thanks 

[M02@rt37]

Hello @Milo25 

What are the bitrate and packet characteristics (CBR/VBR, packet size) of the vlan112 stream compared to vlan 111? and when you swap the decoder or switch ports, does the problem follow the stream or stay on the same port?

[Milo25]

hello

thanks for the prompt reply,

the bit rate of the packet is 30 mbps

when i swap the port for vlan 112 the problem follow the stream

the problem is observed only for Vlan 112!!!

thanks 

[Joseph W. Doherty]

Kindly advise for any solution 

Identity cause of issue then remediate.

Video is adversely impacted by any packet loss, real-time video by latency/jitter issues too.

You've described one ingress trunk port and two egress access ports and two VLANs using those ports, but beyond mentioning, in a later reply the problematic VLAN has a bit rate of 30 Mbps, that tells us little, beyond if this is for a single flow it's probably 4K or teleconference video.  I presume that's an average bit rate over some multiple second to multiple minute time period while with real-time video streams, what's happening from millisecond to millisecond can be crucial.

Likewise, we have no idea what's upstream of the trunk port.  It's possible your issue has nothing due to the 9200 (or something, or everything too).

To get to the bottom of this, it may take a lot of time and information from you.

Of course, possibly someone might pop up with an answer like I had a similar problem until I upgraded my IOS, enabled AutoQos, etc.

If you don't get lucky, you might consider engaging a local contract networking engineer, familiar with video, or study much of the available public troubleshooting (digital) video information, which Cisco also publishes.

[Stefan Mihajlov]

@Milo25 behaivor are related IGMP snooping or buffing/Qos diff.. pls verify IGMP snooping is enabled on both vlans and that querier is present, and check for int error/drops.. also u can try swap VLAN assigments between port to isolate "issue" 🙂

[Milo25]

the querier also enable and for both vlan querier is the same ip address 10.0.0.15 and only on Trunk port 1

i also go through the section multicast through browser and i saw the igmp snooping not enable, when i check it and apply does not accept.

but through CLI i checked the igmp snooping globally are enable and for both vlan also 

thanks