By configuring RSTP, edge port, when the switch to modify the priority, changing the topology of the port state fast switching.
1.1.1 Topology
1.1.2 Configuration
1) at STP configuration, as modifications spanning tree mode rstp.
xNet#configure terminal
xNet(config)#spanning-tree mode rstp
xNet(config)#end
XNET #
Check that the port status, block the port 208 ge48
2) Set ge25 as edge ports to achieve rapid transition to the forwarding state properties
xNet#configure terminal
xNet(config)#interface ge25
xNet(config-if)#spanning-tree edgeport
xNet(config-if)#end
XNET #
Priority 3) changing the switch, so that a topology change
xNet#configure terminal
xNet(config)#spanning-tree priority 4096
xNet(config)#end
XNET #
4) Check the port status change
When the topology changes, the port can be quickly switched state, becomes ge1 207 becomes the Discarding state, the other port is Forwarding.
1.1.3 results
By configuring RSTP, edge port, when the switch to modify the priority, changing the topology, the port state can be quickly switched.
1.2 MSTP
Configuration Example 3, Example 1: vlan11, vlan12; Example 2: vlan13, vlan14; Example 3: vlan15; calculating port state change by different instances of the protocol.
1.2.1 Topology
Configuring
1) three exchange points arranged Example 3
Example 1: vlan11, vlan12;
Example 2: vlan13, vlan14;
Example 3: vlan15;
In an example configuration unit 207, 208 and 206 similar to the machine configuration:
a) create vlan
xNet#configure terminal
xNet(config)#vlan database
xNet(config-vlan)#vlan 11-15
xNet(config-vlan)#end
XNET #
b) Configuration MSTP
xNet#configure terminal
xNet(config)#spanning-tree mode mstp
xNet(config)#spanning-tree mst configuration
xNet(config-mst)#instance 1 vlan 11-12
xNet(config-mst)#instance 2 vlan 13-14
xNet(config-mst)#instance 3 vlan 15
xNet(config-mst)#exit
c) Examples of the port to
xNet(config)#interface ge1
xNet(config-if)#switchport
xNet(config-if)#switchport mode trunk
xNet(config-if)#switchport trunk allowed vlan add 11-15
xNet(config-if)#spanning-tree instance 1
xNet(config-if)#spanning-tree instance 2
xNet(config-if)#spanning-tree instance 3
xNet(config-if)#exit
xNet(config)#interface xe3
xNet(config-if)#switchport
xNet(config-if)#switchport mode trunk
xNet(config-if)#switchport trunk allowed vlan add 11-15
xNet(config-if)#spanning-tree instance 1
xNet(config-if)#spanning-tree instance 2
xNet(config-if)#spanning-tree instance 3
xNet(config-if)#end
XNET #
2) three are view each switch port in the port state in each instance, the result is:
command:
xNet#show spanning-tree mst instance 1 interface ge1
…
Examples 1 block of port: 206 xe1
Example 2 block of port: 206 xe1
Example 3 block of port: 206 xe1
Other ports are Forwarding
3) change the priority of a switch, each switch as an example of the root (root 207 of Example 1, Example 2 as the root 208, the root 206 of Example 3):
207：
xNet#configure terminal
xNet(config)#spanning-tree instance 1 priority 0
xNet(config)#end
XNET #
208：
xNet#configure terminal
xNet(config)#spanning-tree instance 2 priority 0
xNet(config)#end
XNET #
206：
xNet#configure terminal
xNet(config)#spanning-tree instance 3 priority 0
xNet(config)#end
XNET #
4) Check the port status after the Priority Review:
Examples 1 block of port: 206 xe1
Example 2 block of port: 206 xe3
Example 3 block of port: 208 ge1
Other ports are Forwarding
1.2.3 results
Configuration Example 3, Example 1: vlan11, vlan12; Example 2: vlan13, vlan14; Example 3: vlan15; calculated by different instances of the port status protocol can vary.