The router ID is used to uniquely identify each router in the OSPF routing domain.If no loopback interfaces are configured, the router chooses the highest active IP address of any of its physical interfaces.
CCNA Guide to Cisco Networking Fourth Edition Ch.8 Answer: OSPF is configured using the router ospf [process id] command.
In OSPF, a topology database is a data structure that each router maintains to store information about the network topology within an OSPF area. It includes details such as the network links, their costs, and the routers connected to those links. This database is used to calculate the best routes for routing packets through the network.
**R1(config-router)# network 172.16.0.0 0.0.31.255 area 0
No router eigrp <AS #> No router ospf <process ID> No router bgp <AS #> No router rip
To start the routing process on a Cisco router, you typically enter the command router [routing_protocol] in global configuration mode, where [routing_protocol] could be protocols like rip, ospf, or eigrp. For example, to start the OSPF routing process, you would use the command router ospf [process_id], where [process_id] is a unique identifier for the OSPF process. This command enables the routing protocol and allows for configuration of related settings.
we would need to redistribute ospf routes into eigrp and vice versa. redistribution will have to be done on an ASBR(autonomus system boundry router) eg: we have an ospf process wid process id 10 running and eigrp with ASN 20 running in our network redistribution on ASBR would be conf t router ospf 10 redistribute eigrp 20 subnets metric 1 and in eigrp conf t router eigrp 20 redistribute ospf metric 1 1 1 1 1 we see i used 5 ones in eigrp process to redistribute opsf into eigrp. thes 1's are metrics for eigrp namely load bandwidth delay reliability
OSPF LSA throttling helps the dampening of LSA updates in OSPF during times of network instability.
OSPF
A DR and BDR in a Cisco network stands for Designated Router and Backup Designated Router. These designations are used when working with certain routing protocols such as Open-Shortest Path First (OSPF)
link state advertisement
Router R1 is participating in the OSPF routing protocol as well as the EIGRP routing protocol. If R1 learns of network 192.168.10.0/24 from both the OSPF and internal EIGRP routing protocols, how will the route appear in the routing table of R1?