Reference Guide

passive-interface {default | interface}
The default is enabled passive interfaces on ALL interfaces in the OSPF process.
Entering the physical interface type, slot, and number enables passive interface on only the identified interface.
– For a Gigabit Ethernet interface, enter the keyword GigabitEthernet then the slot/port information (for
example, passive-interface gi 2/1).
– For a port channel, enter the keywords port-channel then a number from 1 to 255 for TeraScale and
ExaScale.
– For a SONET interface, enter the keyword sonet then the slot/port information (for example, passive-
interface so 2/2).
– For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port
information (for example, passive-interface ten 2/3).
– For a VLAN, enter the keyword vlan then a number from 1 to 4094 (for example, passive-interface
vlan 2222
).
The keyword default 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.
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 the hello packets are not transmitted on that interface (shown in bold).
Example of Viewing Passive Interfaces
FTOS#show ip ospf 34 int
GigabitEthernet 0/0 is up, line protocol is down
Internet Address 10.1.2.100/24, Area 1.1.1.1
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DOWN, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 0.0.0.0
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 13:39:46
Neighbor Count is 0, Adjacent neighbor count is 0
GigabitEthernet 0/1 is up, line protocol is down
Internet Address 10.1.3.100/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 10.1.3.100
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
No Hellos (Passive interface)
Neighbor Count is 0, Adjacent neighbor count is 0
Loopback 45 is up, line protocol is up
Internet Address 10.1.1.23/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type LOOPBACK, Cost: 1
Enabling Fast-Convergence
The fast-convergence CLI sets the minimum origination and arrival LSA parameters to zero (0), allowing rapid route
calculation.
When you disable fast-convergence, origination and arrival LSA parameters are set to 5 seconds and 1 second,
respectively.
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