This article describes how to monitor CGNAT NAT Pool thresholds using SNMP. For CGNAT NAT pools, each PIC on an MultiServices Denser Port Concentrator (MS-DPC) card can support 8.1 million ports for NAT translation.
Use the JUNIPER-NAT-MIB to monitor the utilization of each MS-DPC card and PIC. This MIB identifies the current utilization of each PIC with regard to the number of ports consumed.
There are two ways to monitor the port utilization:
Network Address Translation Resources–Monitoring MIB