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nsr-phantom-holdtime

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 15.1x53-D60 for QFX10000 switches.

Description

Specify to hold phantom IP addresses, that is, prevent these routes from being added to routing tables, for a specified period of time. During this hold-time interval, these routes are maintained in the kernel. After the hold time expires, the routes are added to the routing tables.

We strongly recommend that you configure this statement before you perform a graceful Routing Engine switchover (GRES) when nonstop routing (NSR) is enabled. Doing so prevents traffic loss because routes are added to the routing tables after the hold-time interval expires, but before they are deleted from the kernel during a switchover.

Options

secondsSpecify the interval of time to prevent phantom IP addresses from being added to the routing tables. After this interval expires, the routes are added to the routing tables.
Best Practice

In an EVPN/VXLAN environment with NSR and GRES enabled, the recommended hold-time value is 300 (5 minutes)

Range: 0 through 10000

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.