Reference Guide

Open Shortest Path First (OSPFv2) | 373
To suppress the interface’s participation on an OSPF interface, use the following command in ROUTER
OSPF mode. This command stops the router from sending updates on that interface.
To enable both receiving and sending routing updates, use the
no passive-interface interface command.
When you configure a passive interface, the
show ip ospf process-id interface command adds the words
“passive interface” to indicate that hello packets are not transmitted on that interface
(Figure 20-13).
Command Syntax Command Mode Usage
passive-interface {default |
interface}
CONFIG-ROUTER-OSPF-id Specify whether all or some of the interfaces will be
passive.
Default enabled passive interfaces on ALL
interfaces in the OSPF process.
Entering the physical interface type, slot, and
number enable passive interface on only the
identified interface.
• For a port channel, enter the keyword
port-channel followed by a number from 1 to
128
• For a 10-Gigabit Ethernet interface, enter the
keyword
TenGigabitEthernet followed by the
slot/port information (for example,
passive-interface ten 2/3).
• For a VLAN, enter the keyword vlan followed
by a number from 1 to 4094 (for example,
passive-interface vlan 2222).
• For a 40-Gigabit Ethernet interface, enter the
keyword fortyGigE followed by the slot/port
information.
The default keyword sets all interfaces on this OSPF process as passive. To remove the
passive interface from select interfaces, use the no passive-interface interface
command while passive interface default is configured.