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interface.
Example: Specify interface vlan1 to area 1.
Switch(Config-If-Vlan1)#ip ospf enable area 1
15.4.2.2.10 ip ospf hello-interval
Command: ip ospf hello-interval <time>
no ip ospf hello-interval
Function: Configure the interval for sending HELLO packets from the interface; the “no ip
ospf hello-interval” command restores the default setting.
Parameter: <time> is the interval for sending HELLO packets in seconds, ranging from 1
to 255.
Default: The default HELLO-packet-sending interval is 10 seconds.
Command mode: Interface Mode
Usage Guide: The HELLO packet is a most common packet that is sent to neighbor
layer3 switches regularly for discovering and maintaining the neighborhood and the
election of DR and BDR. The hello-interval value set will be written to the HELLO packet
and send with it. Smaller hello-interval enables faster discovery of network topology
changes and incurs greater routing overhead. For OSPF protocol to run properly, the
hello-interval parameter between the interface and the neighbor layer3 switch must be
the same.
Example: Set the HELLO-packet-sending interval of interface vlan1 to 20 seconds.
Switch(Config-If-Vlan1)#ip ospf hello-interval 20
Related command: ip ospf dead-interval
15.4.2.2.11 ip ospf passive-interface
Command: ip ospf passive-interface
no ip ospf passive-interface
Function: Set an interface to receive OSPF packets only, the “no ip ospf
passive-interface” command cancels the setting.
Default: The interface receives/sends OSPF packets by default.
Command mode: Interface Mode
Example: Set Ethernet interface vlan1 to receive OSPF packet only.
Switch(Config-If-Vlan1)#ip ospf passive-interface