Got a CRS305-1G-4S+IN before Christmas. I've tried a couple of different sets of SFP+ modules (e.g. https://www.amazon.com/gp/product/B08NW1VBX6 and https://www.amazon.com/gp/product/B08P4MJ36T). The CRS305-1G-4S+IN is connect to AT&T's BGW320-500 router, to the single 5Gbps-rated port.
The ISP/cable/connection itself is fine. When I connect it directly to my PC's 10Gbps ethernet port, I get the full 5Gbps up AND down. If I put it behind the CRS305-1G-4S+IN (regardless what SFP+ modules I've tried, configuration settings, etc.)... I get SEVERELY gimped upload speeds (see attachment). I believe this is because the AT&T BGW320-500 utilizes a 5Gbps port, and the CRS305-1G-4S+IN is establishing a 10Gbps link. There's no option for setting auto-negotiation off, using 2.5Gbps or 5Gbps. Only options that have those speeds are 'Advertise' speeds, which seem to do absolutely nothing for the link... as it's always showing 10Gbps in the CRS305-1G-4S+IN and 5Gbps in the BGW320-500.
Is there a plan to fix this (I know I'm not alone w/ this issue), or a way to manually set this rate via a method I'm unaware of? I'm running thin and out of options. At this point, I'm ready to just send this thing back and go another route.
CRS305-1G-4S+IN w/ AT&T 5Gbps... horrible upload speed.
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Re: CRS305-1G-4S+IN w/ AT&T 5Gbps... horrible upload speed.
Unfortunately, Mikrotik devices with SFP+-ports only support NBase-T (2.5GBit/s and 5GBit/s) with their own 10GBase-T Transcievers: Mikrotik S+RJ10.
Re: CRS305-1G-4S+IN w/ AT&T 5Gbps... horrible upload speed.
It is generally the transceiver that has to deal with the speed mismatch.
In the case of the S+RJ10 and AQS-107, flow control has to be enabled and the transceivers will issue pause frames when needed.
I have both of those transceivers, and when running IPerf tests with a 10G client and 1G server using either of the transceiver, the pause frames can be seen in the RX Stats. IPerf reports no retransmissions.
Changing the advertised speed doesn't seem to affect the speed that the transceiver connects at. S+RJ10 still connects at 10G if the opposite end is 10G, even I reduced the advertised speed to 2.5G.
In the case of AQS-107, auto negotiation has to be turned off as well, else it won't even bring up the link. However, even though the interface is reported as 10G, the link seems to work at the lower speeds based on what I see on the opposite-end client that uses fixed port.
https://forums.servethehome.com/index.p ... 107.30004/
In the case of the S+RJ10 and AQS-107, flow control has to be enabled and the transceivers will issue pause frames when needed.
I have both of those transceivers, and when running IPerf tests with a 10G client and 1G server using either of the transceiver, the pause frames can be seen in the RX Stats. IPerf reports no retransmissions.
Changing the advertised speed doesn't seem to affect the speed that the transceiver connects at. S+RJ10 still connects at 10G if the opposite end is 10G, even I reduced the advertised speed to 2.5G.
In the case of AQS-107, auto negotiation has to be turned off as well, else it won't even bring up the link. However, even though the interface is reported as 10G, the link seems to work at the lower speeds based on what I see on the opposite-end client that uses fixed port.
https://forums.servethehome.com/index.p ... 107.30004/