How to configure OSPF on Cisco routers?
The router ospf command entered in global configuration mode with autonomous-system-number argument creates an OSPF routing instance. It is the first step in configuring OSPF on a router as done here on R1: Enter configuration commands, one per line.
How is OSPF used in an autonomous system?
Open Shortest Path First (OSPF version 2) is an open standard IPv4 dynamic routing protocol that is used to exchange routing information within a single Autonomous System (AS). An Autonomous system consists of connected routers managed by one administrative entity and using a particular dynamic routing protocol to share routing information.
What does a backbone router do in OSPF?
Routers that are entirely within the Area 0 backbone are named as backbone routers. A Backbone router has knowledge of all the topology and routing information contained in the whole OSPF network. As the name implies, an “Area Border” router acts as a liaison between network Areas. This router connects together different Areas in the OSPF network.
What should the password be in OSPF packets?
OSPF authentication is implemented by including a password text/hash in OSPF packets. Therefore, if a rogue device wants to inject OSPF packets and get them trusted by routers in the AS, those OSPF contents should include the same password or hash, and use the same authentication method (clear text, MD5, or SHA).
Do you need to change OSPF interface parameters?
You are not required to alter any of these parameters, but some interface parameters must be consistent across all routers in an attached network. Those parameters are controlled by the ip ospf hello-interval, ip ospf dead-interval, and ip ospf authentication-key interface configuration commands.
Can you use OSPF as a point to multipoint network?
In these cases, you can configure the OSPF network type as a point-to-multipoint network. Routing between two routers that are not directly connected will go through the router that has VCs to both routers. Note that you need not configure neighbors when using this feature.
What’s the default distance for an OSPF route?
The default distance for each type of route is 110. Because simplex interfaces between two devices on an Ethernet represent only one network segment, for OSPF you must configure the sending interface to be a passive interface. This configuration prevents OSPF from sending hello packets for the sending interface.