CRS310 as router

RouterOS General
1

Hello,

I use a CRS310 as a router. I know it’s not the right material, but I’m wondering:

In switch mode only (Via SFP+ between my box and my PC via the CRS310), I have a connection speed of 2500Mbps downlink and 600Mbps uplink with my ISP.

With the CRS310 in router mode, I had a download speed of 700Mbps and an upload speed of 500Mbps (with fasttrack). During the speedtest, my CPU was at 95%.

I wanted to test version 7.5 and I was surprised: my download speed is 1000Mbps, and upload 580Mbps but above all, the CPU load does not exceed 80%.

So I’m wondering now what’s holding this switch back from going higher? How can I optimize? Knowing that I just received it and that my configuration is very basic:

  • DHCP Client on sfp-sfpplus1 (WAN interface)
  • DHCP Server on the rest of the ports (LAN bridge)
  • Minimum firewall (drop on input sfp-sfpplus1, except related, established) and fasttrack obviously
  • NAT: just masquerade

No bonding, no Vlan…

Thanks for your help.

2

Different bits and pieces can hold your switch from routing with 100% CPU utilization … one of them could be RAM bandwidth (that might be a bottleneck). But even if your device would go up to 100% CPU load, that would only gain you another 20-25% of throughput.

However, your device is capable of offloading routing to hardware and if all things click together, it would be able to route at (nearly) wirespeed without notable CPU load.

3

Thanks for your feedback. I will try this configuration.

4

Unfortunately l3-hw-offloading/fasttrack is not supported on CRS310 (see my other thread)