Cisco Catalyst 2950 Software Guide

9-27
Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 9 Configuring STP
Configuring Basic STP Features
Configuring the Hello Time
You can configure the interval between the generation of configuration messages by the root switch by
changing the STP hello time.
Note Exercise care when using this command. For most situations, we recommend that you use the
spanning-tree vlan vlan-id root primary and the spanning-tree vlan vlan-id root secondary global
configuration commands to modify the hello time.
Beginning in privileged EXEC mode, follow these steps to configure the STP hello time of a VLAN:
To return the switch to its default setting, use the no spanning-tree vlan vlan-id hello-time global
configuration command.
Configuring the Forwarding-Delay Time for a VLAN
Beginning in privileged EXEC mode, follow these steps to configure the STP forwarding-delay time for
a VLAN:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
spanning-tree vlan vlan-id hello-time seconds Configure the hello time of a VLAN.
The hello time is the interval between the generation of
configuration messages by the root switch. These messages
mean that the switch is alive.
For vlan-id, the range is 1 to 1005. Do not enter leading zeroes.
For seconds, the range is 1 to 10 seconds; the default is 2
seconds.
Step 3
end Return to privileged EXEC mode.
Step 4
show spanning-tree vlan vlan-id bridge [brief]Verifyyourentries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
spanning-tree vlan vlan-id forward-time
seconds
Configure the forward time of a VLAN.
The forward delay is the number of seconds a port waits before
changing from its STP learning and listening states to the
forwarding state.
For vlan-id, the range is 1 to 1005. Do not enter leading zeroes.
For seconds, the range is 4 to 30 seconds; the default is 15
seconds.
Step 3
end Return to privileged EXEC mode.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz