如何配置MSTP?
1、应用场景:
当网络中存在环路时,可以部署STP/RSTP进行破环。但是使用STP/RSTP破环后,局域网内所有的VLAN共享一棵生成树,因此无法在VLAN间实现数据流量的负载均衡,链路被阻塞后将不承载任何流量,造成带宽浪费,还有可能造成部分VLAN的报文无法转发。
MSTP通过把一个交换网络划分成多个域,每个域内形成多个生成树实例,生成树实例独自计算拓扑。将VLAN和生成树实例进行映射后,就可以实现VLAN间数据流量的负载均衡。
例如,图中SwitchC接收到用户VLAN10至VLAN30的流量后,VLAN10至VLAN20的流量从GE0/0/1端口传输,VLAN21至VLAN30的流量从GE0/0/2端口传输,从而不但破除了环路,还实现了VLAN间流量的负载分担。
2、配置思路:
一、在交换机上配置MSTP基本功能。
二、配置处于环网中设备的二层转发功能 ,将所有端口均加入VLAN10~30。
2、配置步骤:
拓扑:
(1)配置SwitchA。
<SwitchA> system-view
[SwitchA] stp region-configuration
[SwitchA-mst-region] region-name RG1
[SwitchA-mst-region] instance 1 vlan 10 to 20
[SwitchA-mst-region] instance 2 vlan 21 to 30
[SwitchA-mst-region] active region-configuration
[SwitchA-mst-region] quit
[SwitchA] stp instance 1 root primary
[SwitchA] stp instance 2 root secondary
[SwitchA] interface gigabitethernet 0/0/3
[SwitchA-GigabitEthernet0/0/3] stp disable
[SwitchA-GigabitEthernet0/0/3] quit
[SwitchA] stp mode mstp
[SwitchA] stp enable
[SwitchA] vlan batch 10 to 30
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type trunk
[SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type trunk
[SwitchA-GigabitEthernet0/0/2] port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/2] quit
(2)配置SwitchB。
<SwitchB> system-view
[SwitchB] stp region-configuration
[SwitchB-mst-region] region-name RG1
[SwitchB-mst-region] instance 1 vlan 10 to 20
[SwitchB-mst-region] instance 2 vlan 21 to 30
[SwitchB-mst-region] active region-configuration
[SwitchB-mst-region] quit
[SwitchB] stp instance 2 root primary
[SwitchB] stp instance 1 root secondary
[SwitchB] stp mode mstp
[SwitchB] stp enable
[SwitchB] vlan batch 10 to 30
[SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type trunk
[SwitchB-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 to 30
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] port link-type trunk
[SwitchB-GigabitEthernet0/0/2] port trunk allow-pass vlan 10 to 30
[SwitchB-GigabitEthernet0/0/2] quit
(3)配置SwitchC。
<SwitchC> system-view
[SwitchC] stp region-configuration
[SwitchC-mst-region] region-name RG1
[SwitchC-mst-region] instance 1 vlan 10 to 20
[SwitchC-mst-region] instance 2 vlan 21 to 30
[SwitchC-mst-region] active region-configuration
[SwitchC-mst-region] quit
[SwitchC] interface gigabitethernet 0/0/3
[SwitchC-GigabitEthernet0/0/3] stp disable
[SwitchC-GigabitEthernet0/0/3] quit
[SwitchC] interface gigabitethernet 0/0/2
[SwitchC-GigabitEthernet0/0/2] stp instance 1 cost 20000
[SwitchC-GigabitEthernet0/0/2] quit
[SwitchC] interface gigabitethernet 0/0/1
[SwitchC-GigabitEthernet0/0/1] stp instance 2 cost 20000
[SwitchC-GigabitEthernet0/0/1] quit
[SwitchC] stp mode mstp
[SwitchC] stp enable
[SwitchC] vlan batch 10 to 30
[SwitchC] interface gigabitethernet 0/0/1
[SwitchC-GigabitEthernet0/0/1] port link-type trunk
[SwitchC-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 to 30
[SwitchC-GigabitEthernet0/0/1] quit
[SwitchC] interface gigabitethernet 0/0/2
[SwitchC-GigabitEthernet0/0/2] port link-type trunk
[SwitchC-GigabitEthernet0/0/2] port trunk allow-pass vlan 10 to 30
[SwitchC-GigabitEthernet0/0/2] quit