Cisco Catalyst 3750 Software Configuration Guide

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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 20 Configuring UDLD
Configuring UDLD
Configuring UDLD
This section describes how to configure UDLD on your switch. It contains this configuration
information:
• Default UDLD Configuration, page 20-4
• UDLD Configuration Guidelines, page 20-4
• Enabling UDLD Globally, page 20-5
• Enabling UDLD on an Interface, page 20-5
• Resetting an Interface Disabled by UDLD, page 20-6
Default UDLD Configuration
Table 20-1 shows the default UDLD configuration.
UDLD Configuration Guidelines
These are the UDLD configuration guidelines:
• UDLD is not supported on ATM ports.
• A UDLD-capable interface also cannot detect a unidirectional link if it is connected to a
UDLD-incapable interface of another switch.
• When configuring the mode (normal or aggressive), make sure that the same mode is configured on
both sides of the link.
Table 20-1 Default UDLD Configuration
Feature Default Setting
UDLD global enable state Globally disabled
UDLD per-port enable state for fiber-optic media Disabled on all Ethernet fiber-optic ports
UDLD per-port enable state for twisted-pair (copper) media Disabled on all Ethernet 10/100 and 1000BASE-TX ports
UDLD aggressive mode Disabled

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing