欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  网络运营

cisco QOS配置案例

程序员文章站 2022-09-15 15:42:37
cisco QOS配置案例   典型QoS配置案例  一般的QoS配置不外乎四个步骤:  1,设置ACL匹配应用流量;  2,设置class-...

cisco QOS配置案例

 

典型QoS配置案例 

一般的QoS配置不外乎四个步骤: 

1,设置ACL匹配应用流量; 

2,设置class-map匹配相应ACL或者相应端口等等,不过一般式匹配ACL; 

3,设置policy-map匹配class-map,然后定一规则动作; 

4,将policy-map绑定到相应的接口上。下面使用一个比较典型的案例来说明QoS的配置步骤:需求:路径带宽为622Mbps,四种应用流量,需要保证如下几点: 

流量1,某一具体应用流量,永远优先传输,最小带宽保证为365Mbps; 

流量2,某一具体应用流量,次优先传输,最小带宽保证为200Mbps; 

流量3,此为业务流量,保证在1和2后的其余带宽下传输即可; 

流量4,某一具体应用流量,保证在123流量外的带宽下传输即可。具体配置如下: 

第一步,定义ACL匹配应用流量: 

ip access-list extended tra1_acl 

permit tcp 1.1.1.0 0.0.0.255 1.1.2.0 0.0.0.255 eq 8818 

ip access-list extended tra2_acl 

permit tcp 1.1.3.0 0.0.0.255 1.1.4.0 0.0.0.255 eq 901 

ip access-list extended tra4_acl 

permit ip 1.1.5.0 0.0.0.255 1.1.6.0 0.0.0.255 

第二步,定义class-map匹配相关ACL: 

class-map match-all tra1_cmap 

match access-group name tra1_acl 

class-map match-all tra2_cmap 

match access-group name tra2_acl 

class-map match-all tra4_cmap 

match access-group name tra4_acl 

第三步,定义policy-map: 

policy-map tra_pmap 

class tra1_cmap 

    set precedence 5 

plicy cir 365000000 bc 8500000 be 13500000 conform-action transmit exceed-action set-prec-transmit 3 violate-action set-prec-transmit 2 

    bandwitch 365000 

class tra2_cmap 

    set precedence 4 

policy cir 200000000 bc 10000000 be 13000000 conform-action transmit exceed-action set-prec-transmit 3 violate-action set-prec-transmit 2 bandwidth 200000 

class tra4_cmap 

    set precedence 1 

class class-default 

    set precedence 2 

第四步,绑定policy-map于相应的接口: 

int pos1/0/0 

service-policy output tra_pmap 

至此,配置完毕。通过命令查看policy-map的匹配情况: 

switch-a#sh policy-map interface pos1/0/0 

POS1/0/0 Service-policy output: tra_map    Class-map: tra1_cmap (match-all) 

      66639423781 packets, 74849682635166 bytes 

      30 second offered rate 260369000 bps, drop rate 0 bps //匹配此class-map的流量速率 

      Match: access-group name tra1_acl 

      Queueing 

      queue limit 91250 (packets) 

      (queue depth/total drops/no-buffer drops) 0/0/0 

      (pkts queued/bytes queued) 66639405294/74849695040832 

      QoS Set 

        ip precedence 5 

          Packets marked 66639423781 

      police: 

          cir 365000000 bps, bc 8500000 bytes, be 13500000 bytes //注意cir、bc和be的单位 

        conformed 66191701966 packets, 74341131469597 bytes; action: transmit 

        exceeded 218369922 packets, 232627302399 bytes; action: set-prec-transmit 4 

        violated 229208950 packets, 275718927918 bytes; action: set-prec-transmit 3 

        conformed 256761000 bps, exceed 1656000 bps, violate 1939000 bps //每个action的流量速率,注意这三个值总和应该大致等于上面的总速率; 

      bandwidth 365000 kbps     Class-map: tra2_cmap (match-all) 

      11315788699 packets, 7283900643868 bytes 

      30 second offered rate 10753000 bps, drop rate 0 bps 

      Match: access-group tra2_acl 

      Queueing 

      queue limit 50000 (packets) 

      (queue depth/total drops/no-buffer drops) 1/0/0 

      (pkts queued/bytes queued) 11315783713/7283897663316 

      QoS Set 

        ip precedence 4 

          Packets marked 11315788699 

      police: 

cir 200000000 bps, bc 10000000 bytes, be 13000000 bytes 

        conformed 11315784826 packets, 7283898283723 bytes; action: transmit 

        exceeded 0 packets, 0 bytes; action: set-prec-transmit 3 

        violated 0 packets, 0 bytes; action: set-prec-transmit 2 

        conformed 10753000 bps, exceed 0 bps, violate 0 bps 

      bandwidth 200000 kbps     Class-map: tra4_cmap (match-all) 

      1751296887 packets, 2633425803184 bytes 

      30 second offered rate 149000 bps, drop rate 0 bps 

      Match: access-group name tra4_acl 

      QoS Set 

        ip precedence 1 

          Packets marked 1751296887     Class-map: class-default (match-any) 

      22956539608 packets, 17721898306471 bytes 

      30 second offered rate 196094000 bps, drop rate 528000 bps 

      Match: any 

      queue limit 14250 (packets) 

      (queue depth/total drops/no-buffer drops) 0/9004701/0 

      (pkts queued/bytes queued) 24700897941/20350618920708 

      QoS Set 

        ip precedence 2 

          Packets marked 22958504481 

switch-a#必要命令解释: 

plicy cir 365000000 bc 8500000 be 13500000 conform-action transmit exceed-action set-prec-transmit 3 violate-action set-prec-transmit 2 

cir为承诺的带宽速率,即需要保证的带宽速率,单位为bps; 

bc为普通突发,单位为bytes; 

be为最高突发,单位为bytes; 

set-prec-transmit,表示设置IP优先级并转发数据包; 

上面整体命令解释为:承诺带宽365Mbps,普通突发为8.5Mbytes,最高突发为13.5Mbytes。当速率小于450Mbps(365+85)是转发数据包,当超过450Mbps小于500Mbps(365+135)是重写IP优先级为3并转发数据包,当超过500Mbps是重写IP优先级为2并转发数据包。