Example for Configuring 1588 ATR Transparent Transmission Time Synchronization in a Dual-Server Scenario

In a 1588 ATR domain, a client can establish a client/server relationship with two remote clock servers and send unicast negotiation requests to these clock servers to implement 1588 ATR time synchronization. Once the master clock server becomes faulty, the client automatically initiates a connection request to the slave clock server.

Networking Requirements

On the IP RAN shown in Figure 1, time synchronization needs to be performed between NodeBs, but the third-party network (such as a microwave or switch network) does not support 1588v2. In this case, 1588 ATR can be configured to allow time synchronization over the third-party network. NetEngine 8000 Fs enabled with 1588 ATR can function as a BC to synchronize time information with upstream devices and as a 1588 ATR server to synchronize time information with NodeBs.

Server1 and Server2 are the master and slave clock servers. A client initiates Layer 3 unicast negotiation requests to both Server1 and Server2 using 1588 ATR packets to obtain time synchronization information. If the client is disconnected from Server1, the client then initiates a Layer 3 unicast negotiation request to Server2 to ensure time synchronization with the clock server.

Figure 1 1588 ATR configuration in a dual-server scenario
Click to enlarge

Configuration Roadmap

The configuration roadmap is as follows:

Configure unicast negotiation on a 1588 ATR client.
Configure unicast negotiation on Server1 and Server2.
Adjust parameters of the unicast negotiation between the 1588 ATR client and servers.

Data Preparation

To complete the configuration, you need the following data:

Local server's IP address
1588 ATR domain where the servers reside
Outbound interface for transmitting 1588 ATR packets
DSCP priority value of 1588 ATR packets

Procedure

Configure unicast negotiation on a 1588 ATR client.
For details about how to configure unicast negotiation on a 1588 ATR client, see the configuration manual.

Configure unicast negotiation on Server1 and Server2.

Configure unicast negotiation on Server1.

<Server1> system-view
[~Server1] interface loopback 0
[*Server1-Loopback0] ip address 1.1.1.1 32
[*Server1-Loopback0] commit
[~Server1-Loopback0] quit
[*Server1] ptp-adaptive enable
[*Server1] ptp-adaptive device-type server
[*Server1] ptp-adaptive time profile
[*Server1] ptp-adaptive domain 45
[*Server1] ptp-adaptive local-ip 1.1.1.1
[*Server1] ptp-adaptive atr unicast-negotiate enable
[*Server1] interface gigabitethernet 0/1/0
[*Server1-GigabitEthernet0/1/0] ptp-adaptive atr enable
[*Server1-GigabitEthernet0/1/0] commit
[*Server1-GigabitEthernet0/1/0] quit
[*Server1] commit

Configure unicast negotiation on Server2.

<Server2> system-view
[~Server2] interface loopback 0
[*Server2-Loopback0] ip address 2.2.2.2 32
[*Server2-Loopback0] commit
[~Server2-Loopback0] quit
[*Server2] ptp-adaptive enable
[*Server2] ptp-adaptive device-type server
[*Server2] ptp-adaptive time profile
[*Server2] ptp-adaptive domain 45
[*Server2] ptp-adaptive local-ip 2.2.2.2
[*Server2] ptp-adaptive atr unicast-negotiate enable
[*Server2] interface gigabitethernet 0/1/0
[*Server2-GigabitEthernet0/1/0] ptp-adaptive atr enable
[*Server2-GigabitEthernet0/1/0] commit
[*Server2-GigabitEthernet0/1/0] quit
[*Server2] commit

Adjust parameters of the unicast negotiation between the 1588 ATR client and servers.
- Adjust parameters of the unicast negotiation between the 1588 ATR client and Server1.
```
[*Server1] ptp-adaptive dscp 60
[*Server1] commit
```
- Adjust parameters of the unicast negotiation between the 1588 ATR client and Server2.
```
[*Server2] ptp-adaptive dscp 60
[*Server2] commit
```

Verify the configuration.

# View all configurations of the 1588 ATR module on the servers. The following example uses the command output on Server1.

<Server1> display ptp-adaptive all
Device config info
-------------------------------------------------------------------------------
Ptp adaptive state      :enable           Device type        :server
Sync mode               :time             Current state      :master
Packet dscp             :60               Domain value       :45
Local ip                :1.1.1.1          Server board       :3
Profile                 :time
VPN                     :none

Client info
    ID  Ip Address       Clock ID          Mode     Announce  Sync  Delay_resp
-------------------------------------------------------------------------------
0   0   3.3.3.3          2cab00fffec65e58  two-way  1         -7    -7
1   1   4.4.4.4          286ed4fffebcdc76  two-way  1         -7    -7

# View 1588 ATR related configurations on the servers. The following example uses the command output on Server1.

<Server1> display ptp-adaptive config
Device config info
-------------------------------------------------------------------------------
Ptp adaptive state      :enable           Device type        :server
Sync mode               :time             Current state      :master
Packet dscp             :60               Domain value       :45
Local ip                :1.1.1.1          Server board       :
3
Profile                 :time
VPN                     :none

Port config info
Name                         ATR enable
-----------------------------------
GigabitEthernet0/1/0         true

# View configurations of the 1588 ATR client.

<Server1> display ptp-adaptive client 0
Client id           :0                 IP address          :3.3.3.3
Clock id            :2cab00fffec65e58  Mode                :two-way
Announce interval   :1                 Announce duration   :300s
Sync interval       :-7                Sync duration       :300s
Delay_resp interval :-7                Delay_resp duration :300s

Receive packet statistics
---------------------------------------------------------------------------
Signalling          :60                Delay_req           :655778

Send packet statistics
---------------------------------------------------------------------------
Signalling          :60                Announce            :2547
Sync                :655945            Delay_resp          :655778

Discard packet statistics
---------------------------------------------------------------------------
Signalling          :0
Delay_req           :0

Configuration Files

Server1 configuration file

#
 sysname Server1
#
 ptp-adaptive enable
 ptp-adaptive device-type server
 ptp-adaptive time profile
 ptp-adaptive domain 45
 ptp-adaptive local-ip 1.1.1.1
 ptp-adaptive atr unicast-negotiate enable
 ptp-adaptive dscp 60
#
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
#
interface gigabitethernet 0/1/0
 ptp-adaptive atr enable
# 
return

Server2 configuration file

#
 sysname Server2
#
 ptp-adaptive enable
 ptp-adaptive device-type server
 ptp-adaptive time profile
 ptp-adaptive domain 45
 ptp-adaptive local-ip 2.2.2.2
 ptp-adaptive atr unicast-negotiate enable
 ptp-adaptive dscp 60
#
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
#
interface gigabitethernet 0/1/0
 ptp-adaptive atr enable
# 
return