Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
upgrade preserve
upgrade preserve
Use the upgrade preserve controller configuration command to prevent an upgrade from taking place
on a controller in a Long-Reach Ethernet (LRE) switch and on all the devices that remotely connect to
it. Use the no form of the command to allow upgrades on the devices.
upgrade preserve
no upgrade preserve
This command is available only on a Catalyst 2950 LRE switch.
Syntax Description This command has no arguments or keywords.
Command Modes Controller configuration
Command History
Usage Guidelines When you use the upgrade preserve controller configuration command, an LRE switch does not
upgrade a controller and all the devices connected to it during an LRE upgrade. This command does not
affect other controllers in the switch and their connected devices.
Examples This example shows how to prevent the controller 0, and the CPE devices attached to it, from being
upgraded:
Switch# configure terminal
Switch(config)# controller longreachethernet 0
Switch(config-controller)# upgrade preserve
Related Commands
Release Modification
12.1(11)YJ This command was introduced.
Command Description
controller longreachethernet Enter controller configuration mode.
upgrade binary Configures upgrades on either end of an LRE link.

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