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Hierarchy Level

Release Information

Statement introduced in Junos OS Release 12.1.

interface interface-name option introduced in Junos OS Release 17.1 for the MX Series.


Modify the maximum size of IS-IS hello packets. IS-IS sends hello packets out of all IS-IS enabled interfaces to discover neighbors and form adjacencies between the devices. Based on the actual MTU of the physical interface, you can configure upto 16000 bytes as the maximum size for IS-IS packets.


sizeMaximum size allocated for IS-IS hello packets.

Range: 512 through 16000 bytes

Default: 1492 bytes

Required Privilege Level

routing—To view this statement in the configuration.

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