Setting an Interval for Sending Hello Packets

Context

OSPF interfaces periodically send Hello packets to establish and maintain neighbor relationships. The sending interval must be the same between any two neighbors. Otherwise, OSPF neighbor relationships cannot be established.

Procedure

Run system-view

The system view is displayed.
Run interface interface-type interface-number

The OSPF interface view is displayed.
(Optional) On an Ethernet interface, run undo portswitch
The interface is switched to Layer 3 mode.

By default, an Ethernet interface works in Layer 2 mode.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
Run ospf timer hello interval [ conservative ]

An interval at which the OSPF interface sends Hello packets is set.

By default, the interval is 10s on a P2P or broadcast interface, and 30s on a P2MP or NBMA interface. The dead time after which an OSPF neighbor relationship expires on an interface is four times the interval for sending Hello packets on the interface.