Chapter 6 Configuring the System
Configuring STP
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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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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. The following options
define how your switch responds when STP reconfigures itself.
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 indicate 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.
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