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hold-time (Redundant Ethernet Interfaces)

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 18.4R1 for the SRX Series.

Description

The hold timer enables interface damping by not advertising interface transitions until the hold timer duration has passed. When a hold-down timer is configured for a parent RETH interface and the primary child interface goes from up to down, the down hold-time timer is triggered. Every interface transition that occurs during the down hold-time is ignored. When the timer expires and the primary child interface state is still down, then the router begins to advertise the parent RETH interface as being down. Similarly, when a hold-up timer is configured for a parent RETH interface and the primary child interface goes from down to up, the up hold-time timer is triggered. Every interface transition that occurs during the up hold-time is ignored. When the timer expires and the primary child interface state is still up, then the router begins to advertise the parent RETH interface as being up.

The hold timer (both up and down) improves the flexibility and resilience of SRX devices. Specify the timer value in seconds to reduce unnecessary loss of traffic and downtime.

Note

Starting in Junos OS release 18.4R1, all SRX devices have default delay timer of 11 seconds for both up hold-time and down hold-time.

Options

down seconds—Hold time to use when an interface transitions from up to down.

up seconds—Hold time to use when an interface transitions from down to up.

Required Privilege Level

interface—To view this statement in the configuration.

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