What is OSPF passive interfaces?

In OSPF, Passive interface is somewhat like EIGRP where Hello packets are suppressed in addition to neighbor relationship. Passive interface in OSPF allows the connected network of an interface to be advertised throughout the OSPF domain, but stop the sending of hello packets.

What is passive-interface default OSPF?

To prevent these problems, one can set all interfaces as passive by default with the ‘passive-interface default’ command. Setting an interface as passive disables the sending of routing updates on that interface, hence adjacencies will not be formed in OSPF.

Why would you want to set an OSPF interface to passive?

If someone on the computer starts an application that replies with OSPF hello packets then R1 will try to become neighbors. An attacker could advertise fake routes using this technique. To prevent this from happening, we can use the passive-interface command.

What command do you use to verify the passive-interface?

To configure an interface as a passive interface in EIGRP, you’ll use the passive-interface interface#/# command in EIGRP router configuration mode. To verify rather or not an interface is in passive-mode you can use the show ip protocols command in privileged mode.

What is the passive interface command in OSPF?

Passive-interface command is used in all routing protocols to disable sending updates out from a specific interface. This behavior stops both outgoing and incoming routing updates. In OSPF the passive-interface has a similar behavior to EIGRP. The command suppresses hello packets and hence neighbor relationships.

What is IP OSPF process ID area ID?

The ip ospf process-id area area-id command is used in interface configuration mode to make OSPFv3 run on an interface. You can quickly scan the output of show running-config to identify the OSPFv3 interfaces as well as the area number for each.

What happens when you use the network command in OSPF?

OSPF Passive Interface. When you use the network command in OSPF, two things will happen: All interfaces that have a network that falls within the range of the network command will be advertised in OSPF. OSPF hello packets are sent on these interfaces. Sometimes it’s undesirable to send OSPF hello packets on certain interfaces.

Which is the ABR in OSPFv3 process ID 1?

The router R1 is the ABR (area border router), with OSPFv3 process ID 1, and OSPFv3 enabled on four interfaces: There is nothing in the configuration of R1 that explicitly sets it as ABR. We will configure interfaces of R1 in different OSPFv3 areas automatically making R1 and ABR.