拓扑说明：
（1）生成树：用户vlan为300－400，800－900。vlan 300-400为instance 1，根桥在qd-dl-s1上，vlan 800-900为instance 2，根桥在qd-dl-s2上，instance 0 的根桥在qd-dl-s2上。域名为“qddl”，域修正值（revision）为“1”。
（2）VRRP:vlan 300-400的svi的master在qd-dl-s1上，vlan 800-900的svi的master在qd-dl-s2上。Master的产生通过两种方法：一种通过设置接口的IP地址和VRRP组的网关IP地址一致，在这种情况下，设置成和VRRP组的网关IP地址相同的接口IP地址优先级为最高255，自动成为master，比如VRRP组26就是这种情况。另一种是通过设置接口优先级，高优先级选举为master，比如VRRP组31就是这种情况。同时将VRRP通告时间设置为10秒。
具体配置
qd-dl-s1#sh run
spanning-tree //开启生成树
spanning-tree mst configuration //配置生成树的模式为MSTP
instance 1 vlan 300-400 //配置vlan－instance的对应关系
instance 2 vlan 800-900
name qddl //配置域名
revision 1 //配置域修正值为 1。注意在域名，域修正值，vlan－instance对应关系都要配置一致。
!
spanning-tree mst 0 priority 8192 //通过设置mst 0 优先级为8192，设置该设备为备份根桥
spanning-tree mst 1 priority 4096 //通过设置mst 1 优先级为4096，设置该设备为根桥
spanning-tree mst 2 priority 8192 //通过设置mst 2 优先级为8192，设置该设备为备份根桥
!
interface Vlan 326
description shengchanxitongjiankong-yewu
ip address 48.2.63.1 255.255.255.0
vrrp 26 ip 48.2.63.1 //实接口的ip地址和vrrp组26虚ip地址配置成一样，则该接口拥有最高优先级255，直接成为master主路由器
vrrp 26 timer 10 //修改VRRP的通告时间间隔为10秒，这样VRRP发生振荡时间拉长到30秒。
!
interface Vlan 331
description dl-yw-vlan1
ip address 48.0.44.250 255.255.255.0 vrrp 31 ip 48.0.44.254
vrrp 31 priority 150 //通过设置接口优先级为150，竞选成为master主路由器（对端设备qd-dl-s2接口优先级为120，竞选为backup路由器）
vrrp 31 timer 10
!
interface Vlan 332
description dl-yw-vlan2
ip address 48.0.45.250 255.255.255.0
vrrp 32 ip 48.0.45.254
vrrp 32 priority 150
vrrp 32 timer 10
!
interface Vlan 333
description dl-yw-vlan3
ip address 48.0.46.250 255.255.255.0
vrrp 33 ip 48.0.46.254
vrrp 33 priority 150
vrrp 33 timer 10
!
interface Vlan 334
description dl-yw-vlan4
ip address 48.0.47.250 255.255.255.0
vrrp 34 ip 48.0.47.254
vrrp 34 priority 150
vrrp 34 timer 10
!
interface Vlan 335
description name dl-yw-vlan5
ip address 48.0.48.250 255.255.255.0
vrrp 35 ip 48.0.48.254
vrrp 35 priority 150
vrrp 35 timer 10
!
interface Vlan 336
description name dl-yw-vlan6
ip address 48.0.49.250 255.255.255.0
vrrp 36 ip 48.0.49.254
vrrp 36 priority 150
vrrp 36 timer 10
!
interface Vlan 337
description name dl-yw-vlan7
ip address 48.0.50.250 255.255.255.0
vrrp 37 ip 48.0.50.254
vrrp 37 priority 150
vrrp 37 timer 10
!
interface Vlan 338
description name dl-yw-vlan8
ip address 48.0.51.250 255.255.255.0
vrrp 38 ip 48.0.51.254
vrrp 38 priority 150
vrrp 38 timer 10
!
interface Vlan 400
description guojiyewubu-yewu
ip address 10.106.8.1 255.255.255.0
vrrp 200 ip 10.106.8.1
vrrp 200 timer 10
!
interface Vlan 831
description dl-gl-vlan1
ip address 48.0.172.250 255.255.255.0
vrrp 131 ip 48.0.172.254
vrrp 131 priority 120
vrrp 131 timer 10
!
interface Vlan 832
description dl-gl-vlan2
ip address 48.0.173.250 255.255.255.0
vrrp 132 ip 48.0.173.254
vrrp 132 priority 120
vrrp 132 timer 10
!
interface Vlan 833
description dl-gl-vlan3
ip address 48.0.174.250 255.255.255.0
vrrp 133 ip 48.0.174.254
vrrp 133 priority 120
vrrp 133 timer 10
!
interface Vlan 834
description dl-gl-vlan4
ip address 48.0.175.250 255.255.255.0
vrrp 134 ip 48.0.175.254
vrrp 134 priority 120
vrrp 134 timer 10
!
interface Vlan 835
description name dl-gl-vlan5
ip address 48.0.176.250 255.255.255.0
vrrp 135 ip 48.0.176.254
vrrp 135 priority 120
vrrp 135 timer 10
!
interface Vlan 836
description name dl-gl-vlan6
ip address 48.0.177.250 255.255.255.0
vrrp 136 ip 48.0.177.254
vrrp 136 priority 120
vrrp 136 timer 10
!
interface Vlan 837
description name dl-gl-vlan7
ip address 48.0.178.250 255.255.255.0
vrrp 137 ip 48.0.178.254
vrrp 137 priority 120
vrrp 137 timer 10
!
interface Vlan 838
description name dl-gl-vlan8
ip address 48.0.179.250 255.255.255.0
vrrp 138 ip 48.0.179.254
vrrp 138 priority 120
vrrp 138 timer 10
!
interface Vlan 899
description PBX
ip address 48.0.151.250 255.255.255.0
vrrp 99 ip 48.0.151.254
vrrp 99 priority 120
vrrp 99 timer 10
!
!
end
qd-dl-s2#sh run
spanning-tree //开启生成树协议
spanning-tree mst configuration //配置生成树模式为MSTP
instance 1 vlan 300-400 //配置vlan－instance的对应关系
instance 2 vlan 800-900
name qddl //配置域名
revision 1 //配置域修正值为 1。注意在域名，域修正值，vlan－instance对应关系都要配置一致。
!
spanning-tree mst 0 priority 4096 //通过设置mst 0 优先级为4096，设置该设备为根桥
spanning-tree mst 1 priority 8192 //通过设置mst 1 优先级为8192，设置该设备为备份根桥
spanning-tree mst 2 priority 4096 //通过设置mst 2 优先级为4096，设置该设备为根桥
!
interface Vlan 326
description shengchanxitongjiankong-yewu
ip address 48.2.63.2 255.255.255.0
vrrp 26 ip 48.2.63.1 //由于对端设备qd-dl-s1 接口ip地址配置成跟vrrp组26 虚ip地址一致，因此对端接口直接成为master主路由器，自己变成backup路由器
vrrp 26 timer 10 //同一个接口下的VRRP通告时间要配置成一样
!
interface Vlan 331
description dl-yw-vlan1
ip address 48.0.44.251 255.255.255.0
vrrp 31 ip 48.0.44.254
vrrp 31 priority 120 //该接口优先级比对端设备qd-dl-s1 接口的优先级低，因此竞选成backup路由器
vrrp 31 timer 10
!
interface Vlan 332
description dl-yw-vlan2
ip address 48.0.45.251 255.255.255.0
vrrp 32 ip 48.0.45.254
vrrp 32 priority 120
vrrp 32 timer 10
!
interface Vlan 333
description dl-yw-vlan3
ip address 48.0.46.251 255.255.255.0
vrrp 33 ip 48.0.46.254
vrrp 33 priority 120
vrrp 33 timer 10
!
interface Vlan 334
description dl-yw-vlan4
ip address 48.0.47.251 255.255.255.0
vrrp 34 ip 48.0.47.254
vrrp 34 priority 120
vrrp 34 timer 10
!
interface Vlan 335
description name dl-yw-vlan5
ip address 48.0.48.251 255.255.255.0
vrrp 35 ip 48.0.48.254
vrrp 35 priority 120
vrrp 35 timer 10
!
interface Vlan 336
description name dl-yw-vlan6
ip address 48.0.49.251 255.255.255.0
vrrp 36 ip 48.0.49.254
vrrp 36 priority 120
vrrp 36 timer 10
!
interface Vlan 337
description name dl-yw-vlan7
ip address 48.0.50.251 255.255.255.0
vrrp 37 ip 48.0.50.254
vrrp 37 priority 120
vrrp 37 timer 10
!
interface Vlan 338
description name dl-yw-vlan8
ip address 48.0.51.251 255.255.255.0
vrrp 38 ip 48.0.51.254
vrrp 38 priority 120
vrrp 38 timer 10
!
interface Vlan 400
description guojiyewubu-yewu
ip address 10.106.8.2 255.255.255.0
vrrp 200 ip 10.106.8.1
vrrp 200 timer 10
!
interface Vlan 831
description dl-gl-vlan1
ip address 48.0.172.251 255.255.255.0
vrrp 131 ip 48.0.172.254
vrrp 131 priority 150
vrrp 131 timer 10
!
interface Vlan 832
description dl-gl-vlan2
ip address 48.0.173.251 255.255.255.0
vrrp 132 ip 48.0.173.254
vrrp 132 priority 150
vrrp 132 timer 10
!
interface Vlan 833
description dl-gl-vlan3
ip address 48.0.174.251 255.255.255.0
vrrp 133 ip 48.0.174.254
vrrp 133 priority 150
vrrp 133 timer 10
!
interface Vlan 834
description dl-gl-vlan4
ip address 48.0.175.251 255.255.255.0
vrrp 134 ip 48.0.175.254
vrrp 134 priority 150
vrrp 134 timer 10
!
interface Vlan 835
description name dl-gl-vlan5
ip address 48.0.176.251 255.255.255.0
vrrp 135 ip 48.0.176.254
vrrp 135 priority 150
vrrp 135 timer 10
!
interface Vlan 836
description name dl-gl-vlan6
ip address 48.0.177.251 255.255.255.0
vrrp 136 ip 48.0.177.254
vrrp 136 priority 150
vrrp 136 timer 10
!
interface Vlan 837
description name dl-gl-vlan7
ip address 48.0.178.251 255.255.255.0
vrrp 137 ip 48.0.178.254
vrrp 137 priority 150
vrrp 137 timer 10
!
interface Vlan 838
description name dl-gl-vlan8
ip address 48.0.179.251 255.255.255.0
vrrp 138 ip 48.0.179.254
vrrp 138 priority 150
vrrp 138 timer 10
!
interface Vlan 899
description PBX
ip address 48.0.151.251 255.255.255.0
vrrp 99 ip 48.0.151.254
vrrp 99 priority 150
vrrp 99 timer 10
!
end
1 结束语
VRRP＋MSTP双核心应用方案，网络扩容，维护方便，用户网关和物理链路的双备份，提高了网络系统的可用性。和其他提高网络可用性的方案相比，该方案可以使用较少的客户投资，获得较高的客户收益。同时，在这个方案的基础上，客户可以组合我司产品提高系统可用性的其他技术，比如管理板热备份，获得更高的系统可用性。
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