Name: Cisco Catalyst 3750
Brand: Cisco
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5-4

Catalyst 3750 Metro Switch Software Configuration Guide

78-15870-01

Chapter 5 Administering the Switch

Managing the System Time and Date

Configuring NTP

The switches do not have a hardware-supported clock, and they cannot function as an NTP master clock

to which peers synchronize themselves when an external NTP source is not available. These switches

also have no hardware support for a calendar. As a result, the ntp update-calendar and the ntp master

global configuration commands are not available.

This section contains this configuration information:

• Default NTP Configuration, page 5-4

• Configuring NTP Authentication, page 5-5

• Configuring NTP Associations, page 5-6

• Configuring NTP Broadcast Service, page 5-7

• Configuring NTP Access Restrictions, page 5-8

• Configuring the Source IP Address for NTP Packets, page 5-10

• Displaying the NTP Configuration, page 5-11

Default NTP Configuration

Table 5-1 shows the default NTP configuration.

NTP is enabled on all interfaces by default. All interfaces receive NTP packets.

Table 5-1 Default NTP Configuration

Feature Default Setting

NTP authentication Disabled. No authentication key is specified.

NTP peer or server associations None configured.

NTP broadcast service Disabled; no interface sends or receives NTP broadcast packets.

NTP access restrictions No access control is specified.

NTP packet source IP address The source address is determined by the outgoing interface.

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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