Zte ZXR10 5900 Series User Manual page 65

Chapter 5 Network Protocol Configuration
The "-"of Age in the result indicates that it is the ARP of the switch
vlan interface. The arp is generated in the process of configuring
switch vlan interface address. "s" indicates that it is a static ARP,
and "P" indicates that it is a permanent ARP added manually. The
number means the time since ARP updates last time.
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