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M4250 PTP jitter\Latency
Hi, Any suggestions on what may cause what appears to be jitter spikes with PTP specifically on the M4250? When using similar settings on a Cisco 9200L that is not PTP aware the jitter does not a...
As a follow up after contacting support I did as both they and you suggested. I moved everything to a single switch and a factory reset and used the AV UI menu with a template. The issue remained - but interestingly it wasn't there before apply the template. I disabled PTP residency time stamping - which I believe is the PTP transparent setting and bingo - the PTP graph is as smooth as can be and our xNode has almost 0 jitter on.
I moved this back to our custom configuration and just diabled PTP and it has the same results of correcting our jitter.
In case it helps future product development or other customers - we are using Telos Alliance xNodes to act as an arb PTP clock. Perhaps there is something in the clock being generate that isn't agreeing with the switch?
In any event glad this has been found before going on air - not sure exactly what is going on because we purchased these switches since they were PTP aware. Still glad we did as the other features are great.
I updated support and will see what they say - but this will be my last post here thanks for all your help and great webinar! It was the deciding factor in our purchase of 10+ switches
Hi LaurentMa -
I just wanted to chime in on another post I saw to help understand what I mean regarding the AV UI
This post https://community.netgear.com/t5/Pro-AV-over-IP-Switches/M4250-Crashing/m-p/2214001#M439
Is exactly what was happening when trying to use the AV UI all our switches - which is why we switched to the CLI. We've since updated the firmware but have not tried the AV UI again as are concerned once we go live on air with these switches.
I've sent my support file to the email you suggested for feedback on if what we are experiencing regarding the PTP is normal or not - and if our configuration needs to be changed.
Thanks again and appreciate the quick feedback and support - it's refreshing to see this.
Ryan
As a follow up after contacting support I did as both they and you suggested. I moved everything to a single switch and a factory reset and used the AV UI menu with a template. The issue remained - but interestingly it wasn't there before apply the template. I disabled PTP residency time stamping - which I believe is the PTP transparent setting and bingo - the PTP graph is as smooth as can be and our xNode has almost 0 jitter on.
I moved this back to our custom configuration and just diabled PTP and it has the same results of correcting our jitter.
In case it helps future product development or other customers - we are using Telos Alliance xNodes to act as an arb PTP clock. Perhaps there is something in the clock being generate that isn't agreeing with the switch?
In any event glad this has been found before going on air - not sure exactly what is going on because we purchased these switches since they were PTP aware. Still glad we did as the other features are great.
I updated support and will see what they say - but this will be my last post here thanks for all your help and great webinar! It was the deciding factor in our purchase of 10+ switches
Glad you found a solution, Ryan!
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