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Forum Discussion
Netgear switch VLAN PCP support
Hi there, I'm wondering if theGS108 Netgear switch has hardware support for the PCP in the VLAN tag? My guess is no, but I want to hear from the experts here. Below is my experiments: Setup: ...
The switch core has just a smaller amount of queues as common in this switch world, something like four forwarding Queues in fact, something like High, Medium, Normal, and Low.
In 802.1q and DSCP, settings, we have no control in the Web UI about the 802.1q priority -> Queue resp. DSCP Class Selector (CS)/Assured Forwarding (AF)/Expedited Forwarding (EF) -> Queue mapping.
In my opinion, the documentation and ideally the on-line help should hold a reference to the implied queue mappings. This is something missing all over the documentation of the simple Web Managed (earlier designate Smart Managed Plus).
In your test case, I would assume a 802.1p PCP of 5 should make a difference from the default 1 (or 0) however.
Regards,
-Kurt
PS. I'll requesta moderator to move this thread to the Business -> Smart Plus And Smart Pro Managed Switches Forum section (even if the same question could apply to the GS808E/GS810EMX models here).
Thanks for the reply. A small update.
I found out if I don't set any port speed limit on the Netgear switch, then the PCP prioritization works for the VLAN tagged stream. However, as soon as I limit the egress port on Netgear from the default 1Gbps to 100Mbps (which I need for my experiments), then the prioritization effect is gone. The two UDP streams start sharing the bandwidth equally again.
In short, the port speed limit config overwrites the previous queue mapping config, although the PCP value is still set to 5.
It would be really helpful if the issue can be resolved.
I believe the PCP (Priority Code Point) field you are referring to is applicable to only VLAN ... That Netgear switch does support vlans.
Hi newgear12,
I cannot reproduce the situation you mentioned.
Could you help to provide the following items? It will help to reproduce the situtation. Thanks
1, provide 2 MAC address of the 2 PCs that send UDP streams. Indicate which PC you expect to get higher priority and bandwidth.
2, enable mirror features on GS108Ev3. Send the 2 UDP streams into GS108Ev3 as you did. Use Wireshark to capture 2 UDP streams from GS108Ev3. Provide packet capture file.
3, provide topology chart, which PC is connected to which port, including sender PCs and receiver PC.
4, provide your configuraiton file
Hi WilsonS, thanks for the reply.
What I tried to experiment with is to reproduce the setup shown here:
https://github.com/NXP/dds-tsn/I wanted to use the Netgear switch in the setup instead of the specific TSN ethernet switch. But the prioritization didn't work, which I described earlier.
Sorry I cannot provide the information you asked in short term, because of other urgent things.
But I'll be interested to know if you can create two iperf streams with PCP & link speed limit configuration as described in the repo, and see the bandwidth difference of the two streams.
Will provide you the documents once I get around working on it again.
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