PingingLab传世经典系列《CCNA完全配置宝典》-3.10 PVST基本配置

3.10 PVST基本配置

实验目的：

1、掌握PVST的基本配置。

2、理解PVST的负载均衡原理。

实验拓扑：

实验步骤：

1、依据图中拓扑部署PVST技术，其中SW1为VLAN10的Root，VLAN20的Secondary，SW2为VLAN20的Root，VLAN10的Secondary，配置如下：

SW1(config)#spanning-tree vlan 10 root primary

SW1(config)#spanning-tree vlan 20 root secondary

SW2(config)#spanning-tree vlan 20 root primary

SW2(config)#spanning-tree vlan 10 root secondary

2、查看STP状态，如下：

SW1上：

SW1#show spanning-tree vlan 10 brief

VLAN10

Spanning tree enabled protocol ieee

Root ID Priority 8192

Address cc05.0810.0001

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 8192

Address cc05.0810.0001

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Designated

Name Port ID Prio Cost Sts Cost Bridge ID Port ID

-------------------- ------- ---- ----- --- ----- -------------------- -------

FastEthernet0/0 128.1 128 19 FWD 0 8192 cc05.0810.0001 128.1

FastEthernet0/1 128.2 128 19 FWD 0 8192 cc05.0810.0001 128.2

可以看到，SW1已经成为VLAN 10的主根。

SW2上：

SW2#show spanning-tree vlan 20 brief

VLAN20

Spanning tree enabled protocol ieee

Root ID Priority 8192

Address cc06.0810.0002

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 8192

Address cc06.0810.0002

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Designated

Name Port ID Prio Cost Sts Cost Bridge ID Port ID

-------------------- ------- ---- ----- --- ----- -------------------- -------

FastEthernet0/0 128.1 128 19 FWD 0 8192 cc06.0810.0002 128.1

FastEthernet0/2 128.3 128 19 FWD 0 8192 cc06.0810.0002 128.3

可以看到，SW2已经成为VLAN 20的主根。

SW3上：

SW3#show spanning-tree vlan 10 brief

VLAN10

Spanning tree enabled protocol ieee

Root ID Priority 8192

Address cc05.0810.0001

Cost 19

Port 2 (FastEthernet0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768

Address cc07.0810.0001

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Designated

Name Port ID  Prio  Cost Sts  Cost Bridge ID Port ID

-------------------- ------- ---- ----- --- ----- -------------------- -------

FastEthernet0/1 128.2 128 19  FWD 0 8192  cc05.0810.0001  128.2

FastEthernet0/2 128.3 128 19 BLK 19  16384 cc06.0810.0001  128.3

SW3#show spanning-tree vlan 20 brief

VLAN20

Spanning tree enabled protocol ieee

Root ID Priority 8192

Address cc06.0810.0002

Cost 19

Port 3 (FastEthernet0/2)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32768

Address cc07.0810.0002

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Designated

Name Port ID  Prio Cost Sts Cost Bridge ID Port ID

-------------------- ------- ---- ----- --- ----- -------------------- -------

FastEthernet0/1 128.2 128 19 BLK19 16384 cc05.0810.0002 128.2

FastEthernet0/2 128.3 128 19 FWD 0 8192 cc06.0810.0002 128.3

从上面可以看到，SW3在VLAN10所在生成树中阻塞F0/2，在VLAN20所在生成树阻塞F0/1，通过此方法可以实现负载均衡。此实验完成。

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