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hello-interval (Protocols LDP)


Hierarchy Level


Control the LDP timer that regulates how often hello messages are sent. You can control the rate both link hello messages and targeted hello messages are sent depending on the hierarchy level at which you configure the hello-interval statement.


seconds—Length of time between transmission of hello packets.

  • Range: 1 through 65,535 seconds

  • Default: 5 seconds for link hello messages, 15 seconds for targeted hello messages


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.

Support for LDP targeted hellos added in Junos OS Release 9.5.