How to configure NTP service on PSM server and BTI7800 / BTI7000 series devices

The solution to the issues is to configure NTP service on PSM server. Thus, the PSM server become NTP Client for higher-stratum NTP server and become NTP server for NTP clients of BTI7800 / BTI7000 network elements.

[higher-stratum NTP server]--->[NTP client : PSM with NTP service running : NTP server]--->[NTP Client : BTI7800 / BTI7000 network element]

The solution will allow it to:

Relay NTP protocol exchange between higher-stratum NTP server and network elements.
Enable PSM server to provide local clock as a lower-stratum NTP time source when higher-stratum NTP servers are not available.

The proNX Service Manager Installation and Administration Guide recommends PSM server applications to be installed on a server running minimal install CentOS 7 or RHEL 7.
The NTP service installed with minimal OSes install is ntpd, and ntpd will be used in this article.

Follow the instructions below to setup ntpd on PSM server.

Permit access from the IP (sub)network the network elements reside by adding the line below into /etc/ntp.conf configuration file.

restrict 172.27.0.0 mask 255.255.0.0 nomodify notrap
Add the preferred NTP servers you would otherwise configure on the network elements to /etc/ntp.conf configuration file (both IP address and URL are allowed).

server 172.27.93.93 iburst server example.pool.ntp.org iburst
Enable ntpd to provide PSM server local clock as a stratum 10 server by adding the following into /etc/ntp.conf configuration file

server 127.127.1.0 fudge 127.127.1.0 stratum 10
Configure firewall (if any) to allow access to UDP port 123 on the PSM server. The firewall service by default is not running on PSM server. Example is not provided here. Do this step if firewall service is enabled by server system administrator.
Sample content of basic /etc/ntp.conf. Check OS documentation for more advanced configuration options.

# --- GENERAL CONFIGURATION --- # Prohibit general access to this service. restrict default ignore # Permit access to NTP for Network Elements by its IP range restrict 172.27.0.0 mask 255.255.0.0 nomodify notrap #Preferred higher-stratum NTP servers for PSM to become NTP client with server 172.27.93.93 iburst server example.pool.ntp.org iburst #Enable PSM server to provide local clock as a lower-stratum NTP time source server 127.127.1.0 fudge 127.127.1.0 stratum 10
Restart ntpd service once /etc/ntp.conf configuration file have been edited according to your needs.

[root@LAB-PSM ~]# systemctl restart ntpd [root@LAB-PSM ~]# systemctl status ntpd ● ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled) Active: active (running) since Fri 2020-03-20 15:17:45 CST; 6s ago Process: 18928 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS) Main PID: 18929 (ntpd) CGroup: /system.slice/ntpd.service └─18929 /usr/sbin/ntpd -u ntp:ntp -g Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listen and drop on 1 v6wildcard :: UDP 123 Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listen normally on 2 lo 127.0.0.1 UDP 123 Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listen normally on 3 em1 172.27.93.22 UDP 123 Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listen normally on 4 lo ::1 UDP 123 Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listen normally on 5 em1 fe80::92b1:1cff:fe20:86fb UDP 123 Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: Listening on routing socket on fd #22 for interface updates Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: 0.0.0.0 c016 06 restart Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM Mar 20 15:17:45 LAB-PSM.juniper.net ntpd[18929]: 0.0.0.0 c011 01 freq_not_set Mar 20 15:17:51 LAB-PSM.juniper.net ntpd[18929]: 0.0.0.0 c514 04 freq_mode

Follow the instructions below to setup / check NTP on BTI7800 / BTI700 Elements.

Configure PSM server IP address as NTP server address on BTI7800 / BTI7000 network elements

BTI7800

bti7800# configure Entering configuration mode terminal bti7800(config)# system bti7800(config-system)# ntp server 172.27.93.22 bti7800(config-system)# commit

BTI7000

BTI7000> enable BTI7000# configure terminal BTI7000(config)# ntp BTI7000(config ntp)# ip 172.27.93.22
With the above configuration in place, the network elements will synchronize time with higher-stratum NTP servers when they are available (through PSM server).

BTI7800

bti7800# show system ntpstat remote refid st t when poll reach delay offset jitter ============================================================================== time.cloudflare 101.35.8.220 3 u 18h 64 0 10.508 0.427 0.05

BTI7000

BTI7000> show ntp Polling Period : 01:00 (HH:MM) Sync State : Y Stratum : 3 Reference IP Address : 101.35.8.220 NTP associations (IP address) in random order --------------------------------------------- 172.27.93.22
The network elements synchronize time with PSM server NTP service when higher-stratum NTP servers are not available.

BTI7800

bti7800# show system ntpstat remote refid st t when poll reach delay offset jitter ============================================================================== 172.27.93.22 LOCAL(0) 11 u 39 64 377 0.290 0.537 0.075

BTI7000

BTI7000> show ntp Polling Period : 00:01 (HH:MM) Sync State : Y Stratum : 11 Reference IP Address : 172.27.93.22 NTP associations (IP address) in random order --------------------------------------------- 172.27.93.22

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