This article explains how to synchronize time with Network Time Protocol (NTP) on switch, when the NTP server is reachable through a routing-instance.
Goals
Synchronize the time (NTP) on a switch, when the NTP server is reachable via a routing-instance.
NTP server (172.16.0.9) is reachable through routing-instance (VRF-INSTANCE.inet.0).
Topology
[EX4200] Ge-0/0/4(172.16.0.8):RI *VRF*------------- NTP-SERVER (172.16.0.9)
Configuration
Configuring NTP
set system ntp boot-server 172.16.0.8 set system ntp server 172.16.0.8 set system ntp source-address 172.16.0.9 routing-instance VRF-INSTANCE
Configuring L3 interfaces
set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/30 set interfaces ge-0/0/4 unit 0 family inet address 172.16.0.9/24 set interfaces ge-0/0/10 unit 0 family inet address 192.168.0.1/30
Leaking routes from default instance (inet.0) to routing instance (<instance-name> .inet.0)
set routing-options interface-routes rib-group inet MASTER->VRF set routing-instances VRF-INSTANCE routing-options interface-routes rib-group inet VRF->MASTER set routing-options rib-groups VRF->MASTER import-rib VRF-INSTANCE.inet.0 set routing-options rib-groups VRF->MASTER import-rib inet.0 set routing-options rib-groups MASTER->VRF import-rib inet.0 set routing-options rib-groups MASTER->VRF import-rib VRF-INSTANCE.inet.0
Defining the VRF-INSTANCE routing instance:
set routing-instances VRF-INSTANCE instance-type vrf set routing-instances VRF-INSTANCE interface ge-0/0/4.0 set routing-instances VRF-INSTANCE route-distinguisher 11:11 set routing-instances VRF-INSTANCE vrf-target target:11:11
{master:0}[edit] root@EX4200> show version fpc0: -------------------------------------------------------------------------- Hostname: EX4200 Model: ex4200-48p JUNOS Base OS boot [12.3R11.2] JUNOS Base OS Software Suite [12.3R11.2] JUNOS Kernel Software Suite [12.3R11.2] JUNOS Crypto Software Suite [12.3R11.2] JUNOS Online Documentation [12.3R11.2] JUNOS Enterprise Software Suite [12.3R11.2] JUNOS Packet Forwarding Engine Enterprise Software Suite [12.3R11.2] JUNOS Routing Software Suite [12.3R11.2] JUNOS Web Management [12.3R11.2] JUNOS FIPS mode utilities [12.3R11.2] {master:0}[edit] root@EX4200> show system uptime fpc0: -------------------------------------------------------------------------- Current time: 2022-04-22 10:31:40 UTC System booted: 2022-04-22 08:33:11 UTC (01:58:29 ago) Protocols started: 2022-04-22 08:35:25 UTC (01:56:15 ago) Last configured: 2021-12-12 12:16:10 UTC (18w5d 22:15 ago) by root 10:31AM up 1:58, 1 user, load averages: 0.02, 0.07, 0.07 {master:0}[edit] root@EX4200# show system ntp boot-server 172.16.0.8; server 172.16.0.8; source-address 172.16.0.9 routing-instance VRF; {master:0}[edit] root@EX4200# show routing-instances VRF { instance-type vrf; interface ge-0/0/4.0; route-distinguisher 11:11; vrf-target target:11:11; routing-options { interface-routes { rib-group inet VRF->MASTER; } } } {master:0}[edit] root@EX4200# show routing-options interface-routes { rib-group inet MASTER-VRF; } rib-groups { VRF->MASTER { import-rib [ VRF.inet.0 inet.0 ]; } MASTER-VRF { import-rib [ inet.0 VRF.inet.0 ]; } } {master:0}[edit] root@EX4200# run show interfaces terse | match in Interface Admin Link Proto Local Remote ge-0/0/0.0 up up inet 10.0.0.1/30 ge-0/0/4.0 up up inet 172.16.0.9/24 ge-0/0/10.0 up up inet 192.168.0.1/30 bme0.32768 up up inet 128.0.0.1/2 lo0.16384 up up inet 127.0.0.1 --> 0/0 {master:0}[edit] root@EX4200# run show ntp status status=06e4 leap_none, sync_ntp, 14 events, event_peer/strat_chg, version="ntpd 4.2.0-a Thu Sep 24 12:49:59 UTC 2021 (1)", processor="powerpc", system="JUNOS12.3R11.2", leap=00, stratum=5, precision=-18, rootdelay=96.126, rootdispersion=218.544, peer=38220, refid=172.16.0.8, reftime=dac47be2.6b0f418d Fri, Apr 22 2022 10:30:58.418, poll=6, clock=dac47c24.655b4814 Fri, Apr 22 2022 10:32:04.395, state=4, offset=-109.841, frequency=125.585, jitter=28.518, stability=105.175 {master:0}[edit] root@EX4200# run show ntp associations remote refid st t when poll reach delay offset jitter ============================================================================== *172.16.0.8 80.80.83.32 4 - 3 16 377 1.140 -249.95 23.599 {master:0}[edit] root@EX4200# run show route | no-more inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 10.0.0.0/30 *[Direct/0] 01:56:32 > via ge-0/0/0.0 10.0.0.1/32 *[Local/0] 01:56:42 Local via ge-0/0/0.0 192.168.0.0/30 *[Direct/0] 01:56:33 > via ge-0/0/10.0 192.168.0.1/32 *[Local/0] 01:56:41 Local via ge-0/0/10.0 172.16.0.0/24 *[Direct/0] 01:56:34 > via ge-0/0/4.0 172.16.0.9/32 *[Local/0] 01:56:34 Local via ge-0/0/4.0 224.0.0.22/32 *[IGMP/0] 01:56:46 MultiRecv VRF-INSTANCE.inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 10.0.0.0/30 *[Direct/0] 01:56:32 > via ge-0/0/0.0 10.0.0.1/32 *[Local/0] 01:56:32 Local via ge-0/0/0.0 192.168.0.0/30 *[Direct/0] 01:56:33 > via ge-0/0/10.0 192.168.0.1/32 *[Local/0] 01:56:33 Local via ge-0/0/10.0 172.160.0.0/24 *[Direct/0] 01:56:34 > via ge-0/0/4.0 172.16.0.9/32 *[Local/0] 01:56:41 Local via ge-0/0/4.0 {master:0}[edit] root@EX4200# delete system ntp {master:0}[edit] root@EX4200# commit configuration check succeeds root@EX4200# run set date ? Possible completions: <time> New date and time (YYYYMMDDhhmm.ss) ntp Set system date and time using Network Time Protocol servers {master:0}[edit] root@EX4200# run set date 202112121212.12 Sat Dec 12 12:12:12 UTC 2021 {master:0}[edit] root@EX4200# run show system uptime fpc0: -------------------------------------------------------------------------- Current time: 2021-12-12 12:12:15 UTC System booted: 2021-12-12 10:10:10 UTC (02:02:05 ago) Protocols started: 2021-12-12 10:12:24 UTC (01:59:51 ago) Last configured: 2022-04-22 10:35:01 UTC (-22:-22:-46 ago) by root 12:12PM up 2:02, 1 user, load averages: 0.07, 0.05, 0.06 {master:0}[edit] root@EX4200# rollback 1 load complete {master:0}[edit] root@EX4200# show | compare [edit system] + ntp { + boot-server 172.16.0.8; + server 172.16.0.8; + source-address 172.16.0.9 routing-instance VRF-INSTANCE; + } {master:0}[edit] root@EX4200# commit configuration check succeeds commit complete {master:0}[edit] root@EX4200# run start shell root@EX4200:RE:0% date Fri Apr 22 10:35:41 UTC 2022 <<<<---- root@EX4200:RE:0% exit exit {master:0}[edit] root@EX4200# run show system uptime fpc0: -------------------------------------------------------------------------- Current time: 2022-04-22 10:35:48 UTC <<<<---- System booted: 2022-04-22 08:33:11 UTC (02:02:37 ago) Protocols started: 2022-04-22 08:35:26 UTC (02:00:22 ago) Last configured: 2021-12-12 12:12:27 UTC (18w5d 22:23 ago) by root 10:35AM up 2:03, 1 user, load averages: 0.10, 0.06, 0.06 {master:0}[edit] root@EX4200# run show ntp status status=0664 leap_none, sync_ntp, 6 events, event_peer/strat_chg, <<<<---- version="ntpd 4.2.0-a Thu Sep 24 12:49:59 UTC 2021 (1)", processor="powerpc", system="JUNOS12.3R11.2", leap=00, stratum=5, precision=-18, rootdelay=95.932, rootdispersion=490.130, peer=50324, refid=172.16.0.8, reftime=dac47d42.7ab9df0d Fri, Apr 22 2022 10:36:50.479, poll=6, clock=dac47d53.a0fc5f83 Fri, Apr 22 2022 10:37:07.628, state=4, offset=0.074, frequency=-93.191, jitter=0.247, stability=0.000 {master:0}[edit] root@EX4200# run show ntp associations remote refid st t when poll reach delay offset jitter ============================================================================== *172.16.0.8 80.80.83.32 4 - 14 16 1 0.946 0.074 0.374
192.168.0.0
2021-02-14: Removed unwanted configuration.
2022-09-21: Updated article from using non-compliant IP addresses to RFC standard ones