举一个例子:网吧带宽只有8M,内网PC机有200多台,很可能就是因为有人在下载或者用QQ live等软件导致内网流量过大,远远超过8M。所以一般情况下面都需要做速率的限制,对每台PC机都做。我们处理得很多掉线问题,就是因为没有做限制速度而导致的。通过dis int e1/0看一下内网流量,如果有Overruns,则多半说明内网流量太大,路由器处理不过来了。
[Quidway]dis int e1/0
Ethernet1/0 current state :UP
Line protocol current state :UP
Description : Ethernet1/0 Interface
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Internet Address is 192.168.1.1/24
IP Sending Frames\' Format is PKTFMT_ETHNT_2, Hardware address is 000f-e239-0260
Media type is twisted pair, loopback not set, promiscuous mode not set
100Mb/s, Full-duplex, link type is autonegotiation
Output flow-control is disabled, input flow-control is disabled
Output queue : (Urgent queuing : Size/Length/Discards) 0/50/0
Output queue : (Protocol queuing : Size/Length/Discards) 0/500/0
Output queue : (FIFO queuing : Size/Length/Discards) 0/75/0
Last clearing of counters: Never
Last 300 seconds input rate 220900.42 bytes/sec, 1767203 bits/sec, 572.95 pa
ckets/sec
Last 300 seconds output rate 464099.40 bytes/sec, 3712795 bits/sec, 655.10 p
ackets/sec
Input: 4414550 packets, 3834890077 bytes, 4414550 buffers
58297 broadcasts, 2 multicasts, 0 pauses
127451 errors, 0 runts, 0 giants
0 crc, 0 align errors, 127451 overruns
0 dribbles, 0 drops, 0 no buffers
Output:1206335 packets, 871172966 bytes, 1206335 buffers
955 broadcasts, 0 multicasts, 0 pauses
0 errors, 0 underruns, 0 collisions
0 deferred, 0 lost carriers

AR18-2X在升级到F1707之后,可以实现基于每个IP地址的限速。1863-1最新版本也支持该功能,命令一样。

网吧中限制内网PC的速率,上传速度200K,下载速率300K。
定义192.168.0.2 to 192.168.0.200内每台主机上传的流量
[Quidway] qos carl 1 source-ip-address range 192.168.0.2 to 192.168.0.200 per-address
定义192.168.0.2 to 192.168.0.200内每台主机下载的流量
[Quidway] qos carl 2 destination-ip-address range 192.168.0.2 to 192.168.0.200 per-address
[Quidway] interface ethernet 1/0
-------限制上行速率
[Qudiway-Ethernet1/0] qos car inbound carl 1 cir 200000 cbs 200000 ebs 200000 green pass red discard
------限制下行速率
[Qudiway-Ethernet1/0] qos car outbound carl 2 cir 300000 cbs 300000 ebs 300000 green pass red discard

使用display qos car interface detail命令可以查看内网的流量。