Summary
If we don't limit the user ability to send data, then a large amount of traffic from different users could continuously make the network congested. In order to allocate the network resources to each user fairly and efficiently, the traffic should be limited. For instance, for the flow of a stream at each time interval, we only assign it a portion of the network resources to prevent network congestion caused by excessive burst.
In the ovs mode, user can configure meter to achieve interface and set the speed-limit including ingress and egress.The meter uses the token bucket to evaluate the specifications of the traffic, then makes a policy for the traffic, such as through, remark or drop.
Now we support 1R2C and 2R3C for the token bucket in the ingress meter and egress meter.
Configuration
In different hardware models, the maximum count of meters that PicOS OVS supports is different. User can use the command to check the maximum count.
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root@LNOS-OVS$ovs-vsctl set-meter-ranges egress-meter=3-4 Please reboot for the change to take effect! root@LNOS-OVS$/etc/init.d/picosOVS$systemctl restart picos |
Check egress meter configuration
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root@LNOS-OVS$ovs-vsctl set-meter-ranges egress-meter=3-4 Please reboot for the change to take effect! root@LNOS-OVS$/etc/init.d/picosOVS$systemctl restart picos Ingress meter: root@LNOS-OVS$ovs-ofctl add-meter br0 meter=1,kbps,bands=type=dscp_remark,rate= 100000,prec_level=1,type=drop,rate=300000 root@LNOS-OVS$ovs-ofctl add-meter br0 meter=2,kbps,bands=type=dscp_remark,rate= 100000,prec_level=14,type=drop,rate=300000 Egress meter: ovs-ofctl add-meter br0 meter=3,kbps,bands=type=drop,rate=200000 Add flow: root@LNOS-OVS$ovs-ofctl add-flow br0 in_port=33,ip,dl_src=22:11:11:11:11:11,act ions=meter:1,egress_meter:3,output:35 root@LNOS-OVS$ovs-ofctl add-flow br0 in_port=34,ip,dl_src=22:11:11:11:11:12,act ions=meter:2,egress_meter:3,output:35 root@LNOS-OVS$ root@LNOS-OVS$ovs-appctl pica/dump-flows #0 normal_d permanent flow_id=2 priority=0, actions:drop #2 normal permanent flow_id=6 ip,in_port=33,dl_src=22:11:11:11:11:11, actions:meter(id=1,band(dscp_remark=1),band(drop)),egress_meter(id=3,band(drop)),35 #3 normal permanent flow_id=7 ip,in_port=34,dl_src=22:11:11:11:11:12, actions:meter(id=2,band(dscp_remark=14),band(drop)),egress_meter(id=3,band(drop)),35 Total 3 flows in HW. root@LNOS-OVS$ |
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