Configuring Rapid Spanning Tree - Dell PowerConnect 5424 User Manual

Modifying the LAG STP Parameters
1 Open the STP LAG Settings page.
2 Select a LAG from the Select a LAG drop-down menu.
3 Modify the fields as desired.
4 Click Apply Changes.
The STP LAG parameters are modified, and the device is updated.
Defining STP LAG Settings Using CLI Commands
The following table summarizes the equivalent CLI commands for defining STP LAG settings.
Table 7-21. STP LAG Settings CLI Commands
CLI Command
spanning-tree
spanning-tree disable
spanning-tree cost cost
spanning-tree port-priority priority
spanning-tree guard root
show spanning-tree [ethernet interface |
port-channel port-channel-number]
show spanning-tree [detail] [active |
blockedports]
The following is an example of the CLI commands:
console(config)# interface port-channel 1
console(config-if)# spanning-tree port-priority 16

Configuring Rapid Spanning Tree

While Classic Spanning Tree guarantees preventing L2 forwarding loops in a general network topology,
convergence can take up to 30-60 seconds. The convergence time is considered too long for many
applications. When network topology allows, faster convergence may be possible. The Rapid Spanning
Tree Protocol (RSTP) detects and uses of network topologies that provide faster convergence of the
spanning tree, without creating forwarding loops.
314
Configuring Device Information
Description
Enables spanning tree.
Disables spanning tree on a specific
LAG.
Configures the spanning tree cost
contribution of a LAG.
Configures port priority.
Enables root guard on all the spanning
tree instances on that interface.
Displays spanning tree configuration.
Displays detailed spanning tree
information on active or blocked ports.