Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation

hold-time (Protocols IS-IS)

Syntax

hold-time seconds;

Hierarchy Level

[edit logical-systems logical-system-name protocols isis interface interface-namelevel level-number],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols isis interface interface-name level level-number],[edit protocols isis interface interface-name level level-number],[edit routing-instances routing-instance-name protocols isis interface interface-name level level-number]

Release Information

Statement introduced before Junos OS Release 7.4.

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Statement introduced in Junos OS Release 12.1 for the QFX Series.

Description

Set the length of time a neighbor considers this router to be operative (up) after receiving a hello packet. If the neighbor does not receive another hello packet within the specified time, it marks this routing device as inoperative (down). The hold time itself is advertised in the hello packets.

The hold time specifies how long a neighbor should consider this routing device to be operative without receiving another hello packet. If the neighbor does not receive a hello packet from this routing device within the hold time, it marks the routing device as being unavailable.

For systems configured with graceful routing switchover (GRES) with Graceful Restart, the hold time for Master and Backup Routing Engines should be set to a value higher than 40 seconds. This ensures that adjacencies between the Routing Engine and the neighboring peer 'helper' routers do not time out, stopping graceful restart, and all traffic.

Options

seconds—Hold-time value, in seconds.

Range: 3 through 65,535 seconds, or 1 to send out hello packets every 333 milliseconds

Default: 9 seconds (for designated intermediate system [DIS] routers), 27 seconds (for non-DIS routers; three times the default hello interval)

Required Privilege Level

routing—To view this statement in the configuration.

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

Published: 2014-07-25