配置 RSTP

语言：

此任务显示了在交换机目标上运行的 SEFOS 中的 RSTP 配置中的通信流。此任务将验证在拓扑中是否存在环路，如果检测到环路，则验证是否阻止了备用端口的通信。

有关此任务的拓扑，请参见Switching Feature Topology。

配置初始设置。
请参见Configure Initial Settings。

配置 SEFOS-1 和 SEFOS-2 中的 VLAN 转发。
请参见Configure VLAN Forwarding。

在 SEFOS-1 上，在 RSTP 模式下验证端口状态。

SEFOS-1# show spanning-tree
Root Id          Priority   32768
                 Address    00:14:4f:6c:63:0f 
                 Cost       0
                 Port       0 [0]
                 Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning tree Protocol Enabled.
Bridge is executing the rstp compatible Rapid Spanning Tree Protocol
Bridge Id        Priority 32768
                   Address    00:14:4f:6c:63:0f
                   Cost       0
                   Port       0 [0]
                   Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning tree Protocol Enabled.
 
Bridge is executing the rstp compatible Rapid Spanning Tree Protocol
Bridge Id          Priority 32768
                   Address 00:14:4f:6c:63:0f
                   Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
                   Dynamic Path Cost is Disabled
                   Dynamic Path Cost Lag-Speed Change is Disabled
Name              Role         State        Cost     Prio   Type
----              ----         -----        ----     ----   ----
X10/1            		Designated 	 Forwarding   2000     128 	 P2P
X10/2 	           	Designated 	 Forwarding   2000     128 	 P2P
X10/21           		Designated 	 Forwarding   2000     128 	 P2P
X10/22           		Designated 	 Forwarding   2000     128  	P2P
...

在 SEFOS-2 上，在 RSTP 模式下验证端口状态。

SEFOS-2# show spanning-tree
Root Id         Priority   32768
                Address    00:14:4f:6c:63:0f
                Cost       4000
                Port       X10/1
                Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning tree Protocol Enabled.
 
Bridge is executing the rstp compatible Rapid Spanning Tree Protocol
Bridge Id       Priority 32768
                Address 00:14:4f:6c:6e:0e
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
                Dynamic Path Cost is Disabled
                Dynamic Path Cost Lag-Speed Change is Disabled
Name              Role         State        Cost     Prio   Type
----              ----         -----        ----     ----   ------
X10/1            		Designated  Forwarding   2000     128 	 P2P
X10/21           		root	        Forwarding   2000     128 	 P2P
X10/22           		Alternate   Discarding   2000     128 	P2P
...

从主机 A 对主机 C 执行 ping 命令。
```
# ping -s 20.0.0.30
```
通信将通过 SEFOS-1 上的 xl-ethernet 0/21 端口转发到 SEFOS-2 端口 21。

从 SEFOS-2 关闭 xl-ethernet 0/21 端口并验证端口状态。

SEFOS-2# configure terminal
SEFOS-2(config)# int xl 0/1
SEFOS-2(config)# shut
SEFOS-2(config)# exit
SEFOS-2# show spanning-tree
Root Id         Priority   32768
                Address    00:14:4f:6c:69:0f
                Cost       4000
                Port       Xl0/2
                Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning tree Protocol Enabled.
 
Bridge is executing the rstp compatible Rapid Spanning Tree Protocol
Bridge Id       Priority 32768
                Address 00:14:4f:6c:6e:0e
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
                Dynamic Path Cost is Disabled
                Dynamic Path Cost Lag-Speed Change is Disabled
Name              Role         State        Cost     Prio   Type
----              ----         -----        ----     ----   ------
Xl0/2             root         Forwarding   2000     128    P2P
Xl0/25            root         Forwarding   2000     128    P2P
Xl0/25            root         Forwarding   2000     128    P2P
...

从主机 A 对主机 C 执行 ping 命令。
```
# ping 20.0.0.30
```
通信应当通过 SEFOS-1 上的 xl-ethernet 0/2 端口进行转发。如果 RSTP 正在工作，则端口状态会更改。

配置 RSTP

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