Cisco Catalyst 3550 User Manual

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Catalyst 3550 Multilayer Switch Command Reference
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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
udld port
If the switch software detects a Gigabit Interface Converter (GBIC) module change and the port changes
from fiber optic to nonfiber optic or vice versa, all configurations are maintained.
You can use these commands to reset an interface shut down by UDLD:
• The udld reset privileged EXEC command to reset all interfaces shut down by UDLD
• The shutdown and no shutdown interface configuration commands
• The no udld enable global configuration command followed by the udld {aggressive | enable}
global configuration command to re-enable UDLD globally
• The no udld port interface configuration command followed by the udld port or udld port
aggressive interface configuration command to re-enable UDLD on the specified interface
• The errdisable recovery cause udld and errdisable recovery interval interval global
configuration commands to automatically recover from the UDLD error-disabled state
Examples This example shows how to enable UDLD on an interface:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# udld port
This example shows how to disable UDLD on a fiber-optic interface despite the setting of the udld
global configuration command:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# no udld port
You can verify your settings by entering the show running-config or the show udld interface privileged
EXEC command.
Related Commands Command Description
show running-config Displays the running configuration on the switch. For syntax
information, for more information about configuring an SDM template
Cisco IOS Release 12.2 Configuration Guides and Command
References > Cisco IOS Configuration Fundamentals Command
Reference, Release 12.2 > File Management Commands >
Configuration File Management Commands.
show udld Displays UDLD administrative and operational status for all ports or
the specified port.
udld Enables aggressive or normal mode in UDLD or sets the configurable
message timer time.
udld reset Resets all interfaces shut down by UDLD and permits traffic to again
pass through.

Cisco Catalyst 3550 Specifications

General

Category	Switch
QoS	Yes
Form Factor	Rack-mountable
Manageable	Yes
RAM	64 MB
Model	Catalyst 3550
Uplink Ports	2 x GBIC (Gigabit Interface Converter) or SFP (Small Form-factor Pluggable)
Layer Support	Layer 3
VLAN Support	Yes
MAC Address Table Size	12000 entries
Routing Protocol	EIGRP
Features	QoS
Operating Temperature	32 to 113°F (0 to 45°C)
Operating Humidity	10 - 95% (non-condensing)
Ports	24 or 48 10/100 ports