Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 162)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 6 Configuring the System

Configuring STP

Changing the STP Parameters for a VLAN

The root switch for each VLAN is the switch with the highest priority and transmits topology frames to

other switches in the spanning tree. You can change the root parameters for the VLANs on a selected

switch. These options define how your switch responds when STP reconfigures itself.

Changing the STP Implementation

Beginning in privileged EXEC mode, follow these steps to change the STP implementation. The stp-list

is the list of VLANs to which the STP command applies.

Protocol Implementation of STP to use: IBM or IEEE. The default is IEEE.

Priority Value (0 to 65535) used to identify the root switch. The switch

with the lowest value has the highest priority and is selected as

the root.

Max age Number of seconds (6 to 200) a switch waits without receiving

STP configuration messages before attempting a reconfiguration.

This parameter takes effect when a switch is operating as the root

switch. Switches not acting as the root use the root-switch Max

age parameter.

Hello Time Number of seconds (1 to 10) between the transmission of hello

messages, which mean that the switch is active. Switches not

acting as a root switch use the root-switch Hello-time value.

Forward

Delay

Number of seconds (4 to 200) a port waits before changing from

its STP learning and listening states to the forwarding state. This

wait is necessary so that other switches on the network ensure that

no loop is formed before they allow the port to forward packets.

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

spanning-tree [vlan stp-list]

protocol {ieee | ibm}

Specify the STP implementation to be used for a spanning-tree instance.

Step 3

end Return to privileged EXEC mode.

Step 4

show spanning-tree Verify your entry.

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Cisco Catalyst 2900 Series XL Especificaciones Pagina 162