Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation  Back up to About Overview 
[+] Expand All
[-] Collapse All

Changes in Behavior and Syntax

This section lists the changes in behavior of Junos OS features and changes in the syntax of Junos OS statements and commands from Junos OS Release 15.1F2 for the M Series, MX Series, and T Series.

High Availability and Resiliency

  • New ISSU warning message for VCCV-BFD NSR not being supported—Starting in Junos OS Release 15.1R2, 15.1F2, and later releases, the Junos OS CLI displays a warning message (when you perform a unified in-service software upgrade (ISSU)) about NSR not being supported for Bidirectional Forwarding Detection (BFD) support for virtual circuity connectivity verification (VCCV). You must enter a [yes] or [no] input to confirm whether you want to proceed with the unified ISSU operation or not.

Services Applications

  • Change in the default behavior for memory utilization—Starting in Junos OS Release 15.1F2, by default, the software allocates 1024 (1K) entries for IPv4 flow tables. To allocate fifteen units of 256,000 (256K) IPv4 flow tables, which is the former default value, enter this configuration from the [edit] hierarchy level:
    user@router# set chassis fpc slot-number inline-services flow-table-size ipv4-flow-table-size 15

    Note: Including this statement might result in an FPC restart. Therefore, it is recommended that you make this configuration change only during a maintenance window to prevent disruption of network operations.

Related Documentation

Modified: 2017-07-06