Configuring Auto Edge

The Auto Edge feature is used to enable automatic detection of edge devices or bridges connected to an interface.

For setup, refer to Figure Topology for Configuring Dynamic Path Cost.

Configure the path cost as dynamic in both the switches.

Type the following:

iS5comm(config)# interface gigabitethernet 0/1

iS5comm(config-if)# spanning-tree auto-edge

iS5comm(config-if)# end

Note:

The following output is displayed if Port 1 is connected to a host.

iS5comm# show spanning-tree detail

Spanning tree Protocol Enabled.

MST00 is executing the mstp compatible Multiple Spanning Tree Protocol

Bridge Identifier has Priority 32768, Address 00:01:02:03:04:01

Configured  Max age 20 sec 0 cs,  Forward delay 15 sec 0 cs

Configured Hello Time 2 sec 0 cs

We are root of the spanning tree

Current Root has priority 32768, address  00:01:02:03:04:01

cost of root path is 0

Number of Topology Changes 1, Time since topology Change 100 seconds ago

Transmit Hold-Count 9

Root Times : Max age 20 sec 0 cs     Forward delay 15 sec 0 cs

Port 1 [Gi0/1] of MST00 is Designated, Forwarding

Gi0/1 is operating in the MSTP Mode

Port path cost  2000000, Port priority  128,

Port Identifier  128.1. Port HelloTime  2 sec 0 cs,

Timers:Hello - 1,Forward Delay - 0,Topology Change - 0

Designated root has priority 32768, address 00:01:02:03:04:05

Designated Bridge has priority 32768, address 00:01:02:03:04:05

Designated Port Id is 128.1, Designated pathcost is 0

Operational Forward delay 15 sec 0 cs, Max age 20 sec 0 cs

Number of Transitions to forwarding State: 6

PortFast is enabled

Link type is point to Point

BPDUs : sent 112, received 994

Restricted Role is disabled.

Restricted TCN is disabled.

Note:

The following output is displayed if Port 1 is connected to a host.

iS5comm# show spanning-tree detail

Spanning tree Protocol Enabled.

MST00 is executing the mstp compatible Multiple Spanning Tree Protocol

Bridge Identifier has Priority 32768, Address 00:01:02:03:04:01

Configured  Max age 20 sec 0 cs,  Forward delay 15 sec 0 cs

Configured Hello Time 2 sec 0 cs

We are root of the spanning tree

Current Root has priority 32768, address  00:01:02:03:04:01

cost of root path is 0

Number of Topology Changes 1, Time since topology Change 100 seconds ago

Transmit Hold-Count 9

Root Times : Max age 20 sec 0 cs     Forward delay 15 sec 0 cs

Port 1 [Gi0/1] of MST00 is Designated, Forwarding

Gi0/1 is operating in the MSTP Mode

Port path cost  2000000, Port priority  128,

Port Identifier  128.1. Port HelloTime  2 sec 0 cs,

Timers:Hello - 1,Forward Delay - 0,Topology Change - 0

Designated root has priority 32768, address 00:01:02:03:04:05

Designated Bridge has priority 32768, address 00:01:02:03:04:05

Designated Port Id is 128.1, Designated pathcost is 0

Operational Forward delay 15 sec 0 cs, Max age 20 sec 0 cs

Number of Transitions to forwarding State: 7

PortFast is enabled

Link type is point to Point

BPDUs : sent 112, received 994

Restricted Role is disabled.

Restricted TCN is disabled.

Execute the no spanning-tree auto-edge Interface Configuration Mode command to disable automatic detection of bridge/edge devices.

iS5comm(config-if) # no spanning-tree auto-edge