Assisted Partial Timing Support on ACX7024 and ACX7024X Routers

Configuration

To support this feature on ACX7024 and ACX7024X, you need an APTS node with GNSS source configured at the [edit chassis synchronization] hierarchy level and PTP boundary clock configured at the [edit protocols ptp] hierarchy level as shown below.

1. Configure ptp-mode to enable PTP functionality:

   content_copy zoom_out_map

   set chassis fpc 0 pic 0 ptp-mode

2. Configure GNSS settings:
   content_copy zoom_out_map

   set chassis synchronization network-option option-1
   set chassis synchronization enable-extended-ql-tlv
   set chassis synchronization esmc-transmit interfaces all
   set chassis synchronization gnss-receiver 0 interface
   set chassis synchronization gnss-receiver 0 receiver-type tb-1
   set chassis synchronization gnss-receiver 0 constellation gps l1ca

3. Configure PTP. Note that the clock-mode is set to boundary clock and the base profile is set to G.8275.1 in this configuration for downstream timeReceivers. The configuration [set protocols ptp apts] is required when configuring boundary clock with APTS.

   content_copy zoom_out_map

   set protocols ptp clock-mode boundary
   set protocols ptp profile-type g.8275.1
   set protocols ptp ipv4-dscp 54
   set protocols ptp slave delay-request -4
   set protocols ptp slave sync-interval -4
   set protocols ptp slave grant-duration 500
   set protocols ptp slave interface et-0/0/18.0 unicast-mode transport ipv4
   set protocols ptp slave interface et-0/0/18.0 unicast-mode clock-source 192.168.1.2 local-ip-address 192.168.1.10
   set protocols ptp master interface et-0/0/0.0 unicast-mode transport ipv4
   set protocols ptp master interface et-0/0/0.0 unicast-mode clock-client 10.0.0.2 local-ip-address 10.0.0.10
   set protocols ptp master interface et-0/0/2.0 multicast-mode transport ieee-802.3
   set protocols ptp master interface et-0/0/10.0 multicast-mode transport ieee-802.3
   set protocols ptp apts

   Optionally configure the domain used for APTS profile:

   content_copy zoom_out_map

   set protocols ptp apts domain 44

   You can enable PTP on an interface that belongs to a routing instance:

   content_copy zoom_out_map

   set protocols ptp slave interface et-0/0/0.0 unicast-mode clock-source 192.168.1.2 local-ip-address 192.168.1.10
   set routing-instances PTP-VRF instance-type virtual-router
   set routing-instances PTP-VRF interface et-0/0/0.0

4. (Optional) Configure holdover-in-spec-duration settings by specifying the time in minutes:

   content_copy zoom_out_map

   set protocols ptp holdover-in-spec-duration 10

Verification

• Verify the PTP configuration:
  content_copy zoom_out_map

  user@host> show ptp global-information 
  PTP Global Configuration:
  Domain number           : 24             
  Clock mode              : Boundary       
  Profile: G.8275.1       
  Priority Level1         : 128            
  Priority Level2         : 128            
  Local Priority          : 128            
  Path Trace              : Disabled 
  ESMC QL From Clock Class: Enabled 
  SNMP Trap Status        : Disabled 
  PHY Time Stamping       : Enabled  
  UTC Leap Seconds        : 37      
  Transparent-clock-config : DISABLED
  Transparent-clock-status : N/A     
  APTS                     : Enabled 
  APTS Domain              : 44      
  APTS Unicast Negotiation : Enabled
  Holdover-in-spec Duration: 30 minutes
  
  Slave Parameters:
    Sync Interval         : -6 (64 packets per second - unicast request)
    Delay Request Interval: -6 (64 packets per second - unicast request)
    Announce Interval     : 0 (1 packet per second - unicast request)
    Announce Timeout      : 3   
    Grant Duration        : 300           
  Master Parameters:
    Sync Interval               : -4 (16 packets per second)
    Announce Interval           : -3 (8 packets per second)
    Delay Request Timeout       : <not applicable>
    Clock Step                  : one-step   
    Arbitrary Mode              : FALSE   
  Master Parameters (G.8275.2.enh):
    Min Announce Interval       : -3 (8 packets per second)
    Max Announce Interval       : 0 (1 packets per second)
    Min Sync Interval           : -7 (128 packets per second)
    Max Sync Interval           : 0 (1 packet per second)
    Min Delay Response Interval : -7 (128 packets per second)
    Max Delay Response Interval : 0 (1 packet per second)
  Number of Slaves       : 1  
  Number of Masters      : 3  
  Number of Stateful     : 0  
  

• Verify PTP lock status:

  content_copy zoom_out_map

  user@host> show ptp lock-status detail 
  Lock Status:  
     
  Lock State     : INITIALIZING/FREERUN/ACQURING/PHASE ALIGNED/HOLDOVER 
  Holdover State : In-specification/Out-of-specification (Displayed only when Lock state is HOLDOVER) 
  Phase offset   : x ns (When current source GNSS it is offset from GNSS 
                         When current source is PTP it is offset from PTP master 
                          0 ns when PTP is inactive) 
  State since    : 2023-11-27 05:34:56 PST (00:00:54 ago) 
   
  Source Details:  
  Current Source             : GNSS/PTP/NONE 
  Primary Source             : GNSS Active, Ready or Inactive  
  Secondary Source           : PTP Active, Ready or Inactive 
  
  Selected PTP Master Details:
  Upstream Master address    : 50.1.1.1
  Slave interface            : et-0/0/50.0

• Verify PTP clock details by executing the show ptp clock detail command.

• Verify the available upstream PTP timeTransmitter details by executing the show ptp all-master-clock detail command.

• Verify PTP port details by executing the show ptp port detail command.

• Verify PTP statistics details by executing the show ptp statistics detail command.