44
Root dispersion: 1.15869 ms
Reference time: d0c62687.ab1bba7d Wed, Dec 29 2010 21:28:39.668
# Verify that an IPv4 NTP association has been established between PE 2 and CE 1.
[PE2] display ntp-service sessions
source reference stra reach poll now offset delay disper
********************************************************************************
[1245]10.1.1.1 127.127.1.0 2 1 64 519 -0.0 0.0065 0.0
Notes: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured.
Total sessions : 1
# Verify that server 127.0.0.1 has synchronized to server 10.1.1.1, and server 10.1.1.1 has
synchronized to the local clock.
[PE2] display ntp-service trace
Server 127.0.0.1
Stratum 3 , jitter 0.000, synch distance 796.50.
Server 10.1.1.1
Stratum 2 , jitter 939.00, synch distance 0.0000.
RefID 127.127.1.0
Configuration example for MPLS VPN time synchronization
in symmetric active/passive mode
Network requirements
As shown in Figure 19, 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, perform the following tasks:
• Configure CE 1's local clock as a reference source, with the stratum level 2.
• Configure CE 1 to operate in symmetric active mode.
• Specify VPN 1 as the target VPN.
Figure 19 Network diagram
CE 1
Symmetric passive peer
CE 2 CE
4
CE 3
PE 1
Symmetric
active peer
PE 2
P
VPN 1
VPN 2
VPN 1
VPN 2
10.1.1.1/24 10.3.1.1/24
MPLS backbone
10.1.1.2/24
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