Configure RSTP

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This task shows the traffic flow in the RSTP configuration on SEFOS running on the switch targets. This task verifies whether a loop is present in the topology, if it is detected, and if the traffic is blocked for the alternate port.

See Switching Feature Topology for the topology of this task.

Configure the initial settings.
See Configure Initial Settings.

Configure VLAN forwarding in SEFOS-1 and SEFOS-2.
See Configure VLAN Forwarding.

On SEFOS-1, verify the port status in RSTP mode.

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
...

On SEFOS-2, verify the port status in RSTP mode.

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
...

Ping from host A to host C.
```
# ping -s 20.0.0.30
```
Traffic is forwarded through the xl-ethernet 0/21 port on SEFOS-1 to SEFOS-2 port 21.

Shut down the xl-ethernet 0/21 port from SEFOS-2 and verify the port status.

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
...

Ping from host A to host C.
```
# ping 20.0.0.30
```
Traffic should be forwarded through the xl-ethernet 0/2 port on SEFOS-1. If RSTP is working, there will be a change in the port state.

Configure RSTP

Related Information