Knowledge Base

How to manage Rapid Spanning Tree (RSTP) Thru Command Line on Dell Networking PowerConnect Switches

This article explains how Rapid Spanning Tree Protocol (RSTP) is implemented on Dell Networking PowerConnect switches thru Command Line Interface (CLI).

Topics Covered

  1. Default Spanning Tree values
  2. Enabling RSTP
  3. Setting root bridge priority
  4. Enabling Portfast
  5. Verify Spanning Tree Settings

Default Values for Spanning Tree on PowerConnect

  • enabled globally on all ports
  • RSTP mode is enabled (Classic STP and MSTP are disabled)
  • Switch priority is set to -- 32768
  • PortFast mode set to -- disabled

Enabling RSTP



console# configure

Enters configuration level on the switch

console(config)# spanning-tree mode RSTP

Enables spanning-tree mode RSTP globally on the switch.

console(config)# no spanning-tree mode

Disables spanning-tree globally on the switch

Setting root bridge priority



console# configure

Enter configuration level on the switch.

console(config)# spanning-tree priority 4096

Set switch global spanning-tree priority. Range <0 - 61440>. (in steps of 4096)

The switch with the lowest priority value is elected as the root switch.

Enabling Portfast

It is recommended to configure any edge ports, ports that go to end devices such as printers, phones, servers, workstations, to be set up as Portfast. A port in Portfast will move directly to forwarding state when the link comes up without going through listening or learning states.



console# configure

Enters configuration level on the switch

console(config)# interface te 1/0/1

Enter the specific physical port interface.

console(config)# spanning-tree portfast

Enables portfast on the interface.

Do not configure portfast on interfaces that attach to another switch or network device.

Verify Spanning Tree Settings

console# show spanning-tree

Spanning tree :Enabled - BPDU Flooding :Disabled - Portfast BPDU filtering :Disabled - mode :rstp
CST Regional Root: 80:00:D0:67:E5:A5:7F:C5
Regional Root Path Cost: 0
Priority 32768
Address D067.E5A5.7FC5
This Switch is the Root.
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec TxHoldCount 6 sec

console# show running-config interface tengigabitethernet 1/0/1

spanning-tree portfast

Article ID: HOW10394

Last Date Modified: 06/02/2016 02:18 PM

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