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NTP over routing-instance on EX-series switches

  [KB20758] Show Article Properties


Summary:
This article provides information on how to synchronize the time between the NTP server and NTP client, which are on different networks, via the routing-instance on EX-series switches. In this scenario, Switch 2 is acting as the NTP client, which is syncing time with the NTP server that is connected to switch 1.
Symptoms:


Scenario:

  • 10.130.35.0/24 is the network in the inet.0 master routing-table.

  • 100.100.100.0/24 is the network in routing-instance, R1.
Cause:

Solution:
Configuration:

Switch 1
:

Switch 1 is configured to sync time with the NTP server at 10.130.35.159.

NTP configuration:
set system ntp server 10.130.35.159 version 4
set system ntp server 10.130.35.159 prefer
set system ntp source-address 10.130.35.150
Defining the R1 Routing instance:
set routing-instances R1 instance-type virtual-router
set routing-instances R1 interface ge-0/0/2.0
Defining the policy options:

The p1 policy is defined to accept routes from the R1 instance:
set policy-options policy-statement p1 from instance R1
set policy-options policy-statement p1 then accept
The p2 policy is defined to accept the 10.130.35.150/32 route from the master instance:
set policy-options policy-statement p2 from instance master
set policy-options policy-statement p2 from route-filter 10.130.35.150/32 exact
set policy-options policy-statement p2 then accept
Importing the R1 routing instance into the master routing table:
set routing-options instance-import p1
Importing the 10.130.35.150/32 network from the master routing table to the R1 routing-instance:
set routing-instances R1 routing-options instance-import p2
Switch2:

NTP configuration
:
set system ntp server 10.130.35.150 prefer  
Defining the route to 10.130.35.150:
set routing-options static route 10.130.35.150/32 next-hop 100.100.100.2
The following command is issued to verify the NTP associations:

Switch 1:
user@switch> show ntp associations

remote                       refid         st t  when   poll   reach    delay    offset     jitter
==============================================================================
*10.130.35.159 80.80.83.32   2    - 38      16      377      1.102 11.298  18.420 
Switch 2:
user@switch>show ntp associations
remote                       refid            st t    when   poll     reach       delay      offset    jitter
==============================================================================
*10.130.35.150 10.130.35.159 3      - 20       64       377          1.688    -0.611   2.147 
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