R3721-F3210-F3171-HP High-End Firewalls System Management and Maintenance Configuration Guide-6PW101

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Clock offset: 0.0000 ms
Root delay: 31.00 ms
Root dispersion: 8.31 ms
Peer dispersion: 34.30 ms
Reference time: 16:01:51.713 UTC Sep 19 2005 (C6D95F6F.B6872B02)
As shown above, Firewall A has been synchronized to Firewall C and the clock stratum level of
Firewall A is 3, while that of Firewall C is 2.
# View the NTP session information of Firewall A, which shows that an association has been set up
between Firewall A and Firewall C.
[FirewallA-GigabitEthernet0/1] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 2 254 64 62 -16.0 32.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
Configuring the NTP multicast mode
Network requirements
As shown in Figure 53, Firewall C functions as the NTP server for multiple devices on different network
segments and synchronizes the time among multiple devices. Firewall C's local clock is to be used as a
reference source, with the stratum level of 2. Firewall C operates in multicast server mode and sends out
multicast messages from GigabitEthernet 0/1. Firewall D and Firewall A operates in multicast client mode
and receive multicast messages through their respective GigabitEthernet 0/1.
Figure 53 Network diagram
Configuration procedure
1. Set the IP address for each interface as shown in Figure 53. (Details not shown.)
2. Configure Firewall C:
# Specify the local clock as the reference source, with the stratum level of 2.
<FirewallC> system-view
[FirewallC] ntp-service refclock-master 2