Configure the size of the IPv4 flow table in units of 256K entries.
Prior to Junos OS Release 16.1R1 and 15.1F2, any changes in the configured size of the flow table initiates an automatic reboot of the FPC, and we recommend that you run this command in a maintenance window.
The recommended flow table size is 4 so that it can scale up to 4x256K flows, which is 1M. You can configure more, however, the system will issue a warning message.
Starting with Junos OS Release 16.1R1 and 15.1F2, by default, the software allocates 1K entries for IPv4 flow tables. To allocate fifteen 256K IPv4 flow tables, the former default, you can enter this configuration from the  hierarchy level:
 user@router# set chassis fpc slot-number inline-services flow-table-size ipv4-flow-table-size 15
Starting with Junos OS Release 17.3R1, for LU-based platforms, the maximum number of units is 15. For XL-based platforms, the maximum is 220. For EA-based platforms, the maximum is 48 for MPC7E and MPC9E. For MPC8E, the maximum is 97.
Range: 1 through 245
Default: 1024 (1K)—Starting with Junos OS Release 16.1R1 and 15.1F2
Default: 3,932,160 (3840K)—Prior to Junos OS Release 16.1R1 and 15.1F2
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.