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Cisco路由器进行ip限速

发布时间:2015-06-17 12:08:59作者:知识屋


Cisco路由器进行ip限速
 
本实验限速设备是用一台Cisco2811路由器来完成,本实验分两种方法来做
先看下路由器的flash:
  www.zhishiwu.com  
yourname#dir
Directory of flash:/
 
1 -rw- 25438028 Oct 22 2010 02:25:58 +00:00 c2800nm-ipbase-mz.124-15.T.bin
2 -rw- 1505280 Oct 22 2010 02:26:08 +00:00 common.tar
3 -rw- 931840 Oct 22 2010 02:26:16 +00:00 es.tar
4 -rw- 1038 Oct 22 2010 02:26:20 +00:00 home.shtml
5 -rw- 112640 Oct 22 2010 02:26:26 +00:00 home.tar
6 -rw- 415956 Oct 22 2010 02:26:34 +00:00 sslclient-win-1.1.4.176.pkg
7 -rw- 2748 Oct 22 2010 02:26:38 +00:00 sdmconfig-2811.cfg
8 -rw- 35316 Apr 5 2011 06:09:42 +00:00 crashinfo_20110405-060943
9 -rw- 42068 Apr 5 2011 06:30:26 +00:00 crashinfo_20110405-063027
 
128733184 bytes total (100229120 bytes free)
  www.zhishiwu.com  
以下是实验过程
第一步:用ACL定义要做限速网段或ip地址,一会做分类的时候要调用
access-list 102 permit ip 192.168.1.0 0.0.0.255 any
access-list 102 permit ip any 192.168.1.0 0.0.0.255
第二步:定义class-map ,调用第一步的ACL
class-map match-all 102
 match access-group 102
第三步:定义policy-map,调用class-map,做速率限制
policy-map 102
 class 102
   police 256000 8000 conform-action transmit  exceed-action drop 
第四步:把policy-map应用到接口上
interface FastEthernet0/1
service-policy input 102
service-policy output 102
 
*Apr  5 06:24:04.023: %IP_VFR-4-FRAG_TABLE_OVERFLOW: FastEthernet0/1: the fragment table has reached its maximum threshold 16
yourname#sh policy-map int f0/1
 FastEthernet0/1 
  Service-policy input: 102
    Class-map: 102 (match-all)
      2746 packets, 672324 bytes
      5 minute offered rate 20000 bps, drop rate 0 bps
      Match: access-group 102
      police:
          cir 256000 bps, bc 8000 bytes
        conformed 2746 packets, 672324 bytes; actions:
          transmit 
        exceeded 0 packets, 0 bytes; actions:
          drop 
        conformed 90000 bps, exceed 0 bps
    Class-map: class-default (match-any)
      13407 packets, 1753107 bytes
      5 minute offered rate 49000 bps, drop rate 0 bps
      Match: any 
  Service-policy output: 102
    Class-map: 102 (match-all)
      3506 packets, 2954143 bytes
      5 minute offered rate 68000 bps, drop rate 44000 bps
      Match: access-group 102
      police:
          cir 256000 bps, bc 8000 bytes
        conformed 2243 packets, 1195420 bytes; actions:
          transmit 
        exceeded 1263 packets, 1758723 bytes; actions:
          drop 
        conformed 162000 bps, exceed 239000 bps
    Class-map: class-default (match-any)
      15064 packets, 18750663 bytes
      5 minute offered rate 430000 bps, drop rate 0 bps
      Match: any 
yourname#
 
根据上面信息可以知道已经有流量被drop,也是就是超出限制的部分流量,还有一个单位是要注意的,是bit而不是Byte。下面是迅雷的截图
  实验前:


 
  实验后:


 
上面是第一种做限速的方法,下面我们来看另外一种简单方法
 
首先也是定义ACL:
access-list 102 permit ip 192.168.1.0 0.0.0.255 any
access-list 102 permit ip any 192.168.1.0 0.0.0.255
然后直接在接口下启用rate-limit:
interface FastEthernet0/1
rate-limit input access-group 102 256000 1500 2000 conform-action transmit exceed-action drop
rate-limit output access-group 102 256000 1500 2000 conform-action transmit exceed-action drop
 
这就可以了,限速效果跟第一种方法相当


 
上面两种方法的配置是对整个ip地址段来限速,如果我们要对ip段中的每一个ip进行限速25.6KB/s的话,就要用下面的方法了:
 
access-list 121 permit ip host 192.168.0.21 any
access-list 121 permit ip any host 192.168.0.21
!
access-list 122 permit ip host 192.168.0.22 any
access-list 122 permit ip any host 192.168.0.22
!
access-list 123 permit ip host 192.168.0.23 any
access-list 123 permit ip any host 192.168.0.23
!
class-map match-all 121
 match access-group 121
!
class-map match-all 122
 match access-group 122
!
policy-map xiansu
 class 121
   police 2560000 8000 conform-action transmit  exceed-action drop 
 class 122
   police 2560000 8000 conform-action transmit  exceed-action drop 
!
interface FastEthernet0/1
 service-policy input xiansu
 service-policy output xiansu
 
上面是对192.168.0.21,192.168.0.21限速256KB/s,要是限制整个段的ip,那就自己慢慢写吧。
 
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