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EES4710BD 10 Slots L2/L3/L4 Chassis Switch
Default: The default HELLO-packet-sending interval is 10 seconds.
Command mode: Interface Mode
Usage Guide: The HELLO packet is a most common packet sent to neighboring layer 3 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 neighboring layer 3 switch must be the same.
Example: Setting 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
18.4.2.2.11 ip ospf passive-interface
Command: ip ospf passive-interface
no ip ospf passive-interface
Function: Sets 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: Setting Ethernet interface vlan1 to receive OSPF packet only.
Switch(Config-If-Vlan1)#ip ospf passive-interface
18.4.2.2.12 ip ospf priority
Command: ip ospf priority <priority>
no ip ospf priority
Function: Set the priority of the interface in “designated layer 3 switch” (DR) election; the “no ip
ospf priority” command restores the default setting.
Parameters: < priority> is the priority value, ranging from 0 to 255.
Default: The priority of the interface when electing designated layer 3 switch is 1.
Command mode: Interface Mode
Usage Guide: When two layer 3 switches in the same network segment want to be the “designated
layer 3 switch” (DR), the DR is decided by the priority value, the switch with higher priority
becomes the DR; if priority values are equal, the switch with the larger router-id is selected. When a
layer 3 switch has a priority value of 0, it will not be elected to be either “designated layer 3 switch”
or “backup designated layer 3 switch”.
Example: Configuring the priority of the interface when electing a designated layer 3 switch (DR)
and excluding interface vlan1 from the election, i.e., set the priority to 0.