Reference Guide

Spanning Tree 323
The following is an example of the CLI commands:
Rapid Spanning Tree
While classic spanning tree prevents Layer 2 forwarding loops on a general
network topology, convergence can take from 30 to 60 seconds. This delay
provides time to detect possible loops, and propagate status changes.
Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies
that enable a faster convergence of the spanning tree, without creating
forwarding loops.
To configure RSTP:
1
Click Switching > Spanning Tree > Rapid Spanning Tree in the tree view
to display the
Rapid Spanning Tree: Summary page.
2 To modify RSTP settings on an interface, click Edit and enter the fields:
–
Interface — Select a port or LAG.
–
State — Displays the RSTP state of the selected interface.
–
Role — Displays the port role assigned by the STP algorithm in order
to provide STP paths. The possible options are:
•
Root — This port provides the lowest cost path to forward packets
to root switch.
•
Designated — This port is the interface through which the bridge
is connected to the LAN, which provides the lowest cost path
from the LAN to the Root Bridge.
•
Alternate — This port provides an alternate LAG to the root
switch from the root interface.
console(config)# interface port-channel 1
console(config-if)# spanning-tree disable
console(config-if)# spanning-tree cost 35000
console(config-if)# spanning-tree port-priority 96
console(config-if)# spanning-tree portfast