Configure the Spanning Tree Link Type

If a port is configured as a point-to-point link and its port role is designated, then PVRST+ negotiates a rapid transition to the forwarding state with the other port by using a proposal-handshake agreement mechanism to ensure that the topology is loop free. By default, if the interface is full-duplex, then it is considered to have a point-to-point connection. The default setting of link type can be overridden to enable rapid transition to the forwarding state.

1. In switch C, specify the interface for which the link type is to be configured.

   TOR-2 SEFOS# configure terminal
   TOR-2 SEFOS(config)# interface extreme-ethernet 0/1

   Valid interfaces include physical interfaces and port-channel logical interfaces (port-channel port_channel_number).

2. Configure the link type of the interface as point-to-point.

   TOR-2 SEFOS(config-if)# spanning-tree link-type point-to-point
   TOR-2 SEFOS(config-if)# end

3. Review the spanning tree properties.

   TOR-2 SEFOS# show spanning-tree vlan 10
    
   -------------------------------------------------------------------
   Spanning-tree for VLAN 10
   Root Id         Priority   32778
                   Address    00:14:4f:6c:56:6f
                   Cost       2000
                   Port       Ex0/1
                   Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
   Spanning Tree Enabled Protocol PVRST
   Bridge Id       Priority 32778
                   Address 00:14:4f:6c:6e:0d
                   Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
   Name     Role         State        Cost     Prio   Type
   ----     ----         -----        ----     ----   ------
   Ex0/1    Root         Forwarding   2000     128    P2P
   Ex0/57   Alternate    Discarding   2000     128    P2P
    
   TOR-2 SEFOS#

4. Reset the default link type for the interface.

   TOR-2 SEFOS# configure terminal
   TOR-2 SEFOS(config)# interface extreme-ethernet 0/1
   TOR-2 SEFOS(config-if)# no spanning-tree link-type
   TOR-2 SEFOS(config-if)# end
   TOR-2 SEFOS#