Configuring MPLS VPN time synchronization in symmetric peers mode

As shown in Figure 18, two VPNs are present on PE 1 and PE 2: VPN 1 and VPN 2. CE 1 and CE 3 belong to VPN 1. To synchronize the time between PE 1 and CE 1 in VPN 1, configure CE 1’s local clock as a reference source, with the stratum level 1, configure CE 1 to operate in symmetric peers mode, and specify VPN 1 as the target VPN.

1. Set the IP address for each interface as shown in Figure 18. (Details not shown.)

2. Configure PE 1:

   # Specify CE 1 in VPN 1 as the symmetric-passive peer of PE 1.

   <PE1> system-view
   [PE1] ntp-service unicast-peer vpn-instance vpn1 10.1.1.1
   

   # Display NTP session information and status information on PE 1 a certain period of time later. This information should show that PE 1 has synchronized to CE 1, with the clock stratum level 2.

   [PE1] display ntp-service status
    Clock status: synchronized
    Clock stratum: 2
    Reference clock ID: 10.1.1.1
    Nominal frequency: 63.9100 Hz
    Actual frequency: 63.9100 Hz
    Clock precision: 2^7
    Clock offset: 0.0000 ms
    Root delay: 32.00 ms
    Root dispersion: 0.60 ms
    Peer dispersion: 7.81 ms
    Reference time: 02:44:01.200 UTC Jan 1 2001(BDFA6D71.33333333)
   [PE1] display ntp-service sessions
   source          reference       stra reach poll  now offset  delay disper
   **************************************************************************
   [12345]10.1.1.1       LOCL          1    1   64   29    -12.0   32.0    15.6
   note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured   
   Total associations :  1     
   [PE1] display ntp-service trace   
    server 127.0.0.1,stratum 2, offset -0.012000, synch distance 0.02448
    server 10.1.1.1,stratum 1, offset 0.003500, synch distance 0.00781
    refid 127.127.1.0