configure isis timer hello-interval

configure isis [vlan all | {vlan} vlan_name] timer hello-interval [seconds | minimal] {level [1 | 2]}


This command sets the interval between two consecutive hello transmissions.

Syntax Description

vlan all Applies the timer configuration to all IS-IS This command is available on the ExtremeSwitching X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, 5520 series switches.s.
vlan_name Specifies a single VLAN to which the timer configuration applies.
seconds Sets the timer interval. The range is 1 to 65535 seconds.
minimal Specifies that the hello interval is calculated by dividing 1 second by the hello multiplier.
level [1 | 2] Limits the configuration to either level 1 or level 2. If neither level 1 nor level 2 is specified, the configuration applies to both levels.


10 seconds.

Usage Guidelines

If this router is the elected DIS, hellos are sent three times more frequently than the configured interval.

When the timer configuration is set to minimal, the holding time included in the PDU is set to 1 second. Otherwise, the holding time is computed by multiplying the hello interval by the hello multiplier. The holding time tells the neighboring router how long to wait before declaring the sending router dead.


The following command sets the hello interval timer for all VLANs to 15 seconds:

configure isis vlan all timer hello-interval 15


This command was first available in ExtremeXOS 12.1.

Platform Availability

This command is available on platforms with a Core or Premier license as described in the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.