某大学网络中心使用我司2块SecBlade板卡加S75E实现对校园网用户宽带管理。该校原网通、电信和教育网出口带宽分别为
在该案例中我们只讨论S75E的配置,ACG配置可参考附录《S75E ACG插卡高性能解决方案》。我们使用(源)IP地址的最后几位进行散列实现分流。2块插卡我们选择IP地址的最后1位进行散列,具体的分流方式如下:
IP地址后1位 |
分流的插卡 |
0 |
ACG-0 |
1 |
ACG-1 |
acl number 3000 //源IP最后1位是0
rule 0 permit ip source
acl number 3001 //源IP最后1位是1
rule 0 permit ip source
acl number 3010 //目的IP最后1位是0
rule 0 permit ip destination
acl number 3011 //目的IP最后1位是1
rule 0 permit ip destination
acl number 4000 //未匹配具体ACL的流
rule 0 permit
acl number 4010 //匹配acsei报文
rule 0 permit type
交换机使能acsei,插卡向交换机同步时间
#
acsei server enable
#
网通接口段配置:
vlan 10(内网VLAN)
#
vlan 20(外网VLAN)
#
电信接口段配置:
vlan 100(内网VLAN)
#
vlan 200(外网VLAN)
#
traffic classifier sip0 operator and
if-match acl 3000
traffic classifier dip0 operator and
if-match acl 3010
traffic classifier sip1 operator and
if-match acl 3001
traffic classifier dip1 operator and
if-match acl 3011
traffic classifier Vlan10 operator and
if-match service-vlan-id 10
traffic classifier Vlan20 operator and
if-match service-vlan-id 20
traffic classifier Vlan100 operator and
if-match service-vlan-id 100
traffic classifier Vlan200 operator and
if-match service-vlan-id 200
traffic classifier vlan1 operator and
if-match service-vlan-id 1
traffic classifier ALL operator and
if-match acl 4000
traffic classifier acsei operator and
if-match acl 4010
traffic behavior sip0
redirect interface Ten-GigabitEthernet4/0/1(交换机内部端口,连接ACG板卡4)
traffic behavior sip1
redirect interface Ten-GigabitEthernet5/0/1(交换机内部端口,连接ACG板卡5)
traffic behavior Vlan10
redirect interface GigabitEthernet2/0/2
traffic behavior Vlan20
redirect interface GigabitEthernet2/0/1
traffic behavior Vlan100
redirect interface GigabitEthernet2/0/4
traffic behavior Vlan200
redirect interface GigabitEthernet2/0/3
traffic behavior Unicom-Up
redirect interface GigabitEthernet2/0/2
traffic behavior Unicom-Down
redirect interface GigabitEthernet2/0/1
traffic behavior Telcom-Up
redirect interface GigabitEthernet2/0/4
traffic behavior Telcom-Down
redirect interface GigabitEthernet2/0/3
traffic behavior acsei
filter permit
traffic behavior vlan1 //防止带VLAN1标签的报文报文在重定向的过程中成环
filter deny
qos policy 2-0-1 //根据源IP的最后1位把IP报文分流到不同的ACG插卡上,其他报文S75E直接转发,ACG插卡不处理,该策略用在2/0/1号端口上
classifier sip0 behavior sip0
classifier sip1 behavior sip1
classifier ALL behavior Unicom-Up (在2/0/1端口上将作完QinQ后再进行Qos的操作,即将符合ALL流分类的报文定直接定向从2/0/2送出)
qos policy 2-0-3
classifier sip0 behavior sip0
classifier sip1 behavior sip1
classifier ALL behavior Telcom-Up (在2/0/3端口上将作完QinQ后再进行Qos的操作,即将符合ALL流分类的报文定直接定向从2/0/4送出)
interface GigabitEthernet2/0/1
port link-type hybrid
port hybrid vlan 1 10 20 untagged //从2/0/2进来打上外层vlan标签20的报文能够去掉外层vlan标签出去
port hybrid pvid vlan 10 //从2/0/1口和2/0/2口进来的报文能够携带不同的vlan标签,ACG插卡能够区分流量的方向
qinq enable //能够正确处理带vlan标签的报文
qos apply policy 2-0-1 inbound
#
interface GigabitEthernet2/0/3
port link-type hybrid
port hybrid vlan 1 100 200 untagged
port hybrid pvid vlan 100
qinq enable
qos apply policy 2-0-3 inbound
#
qos policy ACG //在S75E和ACG插卡的内联口上根据vlan重定向
classifier Vlan10 behavior Vlan10(在交换机的内部端口上使用,将ACG板卡处理完的带VLAN10 tag标签的报文重定向至属于VLAN20的2/0/2端口,再重2/0/2送出)
classifier Vlan20 behavior Vlan20
classifier Vlan100 behavior Vlan100
classifier Vlan200 behavior Vlan200
classifier acsei behavior acsei
classifier vlan1 behavior vlan1
interface Ten-GigabitEthernet4/0/1
port link-type trunk
port trunk permit vlan all
qos apply policy ACG inbound(交换机的内部端口,用来和ACG板卡互通)
#
interface Ten-GigabitEthernet5/0/1
port link-type trunk
port trunk permit vlan all
qos apply policy ACG inbound
qos policy 2-0-2 //根据目的IP的最后1位把IP报文分流到不同的ACG插卡上,其他报文S75E直接转发,ACG插卡不处理
classifier dip0 behavior sip0
classifier dip1 behavior sip1
classifier ALL behavior Unicom-Down(将从2/0/1上来的报文重新定向到2/0/1上再送出去)
qos policy 2-0-4
classifier dip0 behavior sip0
classifier dip1 behavior sip1
classifier ALL behavior Telcom-Down
interface GigabitEthernet2/0/2
port link-type hybrid
port hybrid vlan 1 10 20 untagged
port hybrid pvid vlan 20
qinq enable
qos apply policy 2-0-2 inbound
interface GigabitEthernet2/0/4
port link-type hybrid
port hybrid vlan 1 100 200 untagged
port hybrid pvid vlan 200
qinq enable
qos apply policy 2-0-4 inbound
ACG板卡数与选择IP地址后几位进行HASH关系。这里用N,X和分别来表示ACG板卡数,IP地址后X位,N为已知数,X为未知数。P=2的X次方。经验关系如下:P>=N的情况下Min(P%N),即P与N求模后的最小值。这里以N=10,X取不同值时,P%N的值;
若X=1,那么P=2,不满足P>=N要求
X=2,那么P=4,不满足P>=N要求
X=3,那么P=8,不满足P>=N要求
X=4,那么P=16,则P%N=6
X=5,那么P=32,则P%N=2
X=6,那么P=64,则P%N=4
X=7,那么P=128,则P%N=8
X=8,那么P=256,则P%N=6
P%N最小的为2,即X=5时。
该公式为经验所得,可使流量尽量平均分布在每块板卡之上。10块板卡,采用后5位的进行散列的方式,可参考附录《S75E ACG插卡高性能解决方案》。
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