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hello-interval (Protocols RSVP)


Hierarchy Level


Enable the sending of hello packets on the interface.


seconds—Length of time between hello packets. A value of 0 disables the sending of hello packets on the interface.

  • Range: 1 through 60 seconds

  • Default: 9 seconds


The default hello intervals on EX 9200 switches are not sufficient to avoid protocol flapping during an ISSU Linux upgrade. To avoid protocol flapping during the upgrade, configure the hello intervals for 35 seconds or more.

Required Privilege Level

routing—To view this statement in the configuration.

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

Release Information

Statement introduced before Junos OS Release 7.4.