3Com Switch 4800G 24-Port Configuration Manual page 965

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp

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Table of Contents

Configuring NTP

Network requirements

Multicast Mode

Network diagram

Figure 286 Network diagram for NTP multicast mode configuration

Configuration procedure

1 Configuration on Switch C:

# Specify the local clock as the reference source, with the stratum level of 2.

<SwitchC> system-view

[SwitchC] ntp-service refclock-master 2

# Configure Switch C to work in the multicast server mode and send multicast

messages through VLAN-interface 2.

[SwitchC] interface vlan-interface 2

[SwitchC-Vlan-interface2] ntp-service multicast-server

2 Configuration on Switch D:

# Configure Switch D to work in the multicast client mode and receive multicast

messages on VLAN-interface 2.

<SwitchD> system-view

[SwitchD] interface vlan-interface 2

[SwitchD-Vlan-interface2] ntp-service multicast-client

Because Switch D and Switch C are on the same subnet, Switch D can receive the

multicast messages from Switch C without being IGMP-enabled and can be

synchronized to Switch C.

Switch C's local clock is to be used as a reference source, with the stratum level

Switch C works in the multicast server mode and sends out multicast messages

from VLAN-interface 2.

Switch D and Switch A work in the multicast client mode and receive multicast

messages through their respective VLAN-interface 2.

1.0.1 .10 /24

NTP Configuration Examples

3.0.1.31 /24

3.0.1.30 /24

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