cisco ccna 2 book

cisco ccna 2 book.You must specify a process ID when configuring OSPF, which is only locally meaningful. When you configure the command network, you specify an IP address or network number, a wildcard mask (an inverted subnet mask), and the region to which the address or network belongs. The command show ip ospf interface displays OSPF information: router ID, DR, and BDR, and timer; the command show ip ospf neighbor displays the current router's neighbors and their OSPF status.Chapter 19 OSPF Routing 52119.6 Two-Minute Sprints IOverview of OSPF .. OSPF is an open standards-based link state protocol. It is a classless protocol that supports hierarchical routing and route summarization. It uses overhead (the reciprocal of link bandwidth) as a metric.. To process the extra information. the OSPF requires more memory and a faster processor.. Each OSPF router has an ID, which is the largest loopback interface IP address or the largest active interface IP address.. OSPF routers use LSAs to learn the network topology. To share information with each other, the two routers must be neighbors: their area numbers and types, timers, and passwords must be the same.. DR and BDR help share topology information. Traffic sent to the DR/BDR is multicast with a destination address of 224.0.0.6; traffic sent to all routers in the segment has a destination address of 224.0.0.5. Hell. messages are sent at 10-second intervals and have an expiration timer of 40 seconds. DR sends periodic updates every 30 minutes.. You must assign a process ID to the OSPF routing process. such IDs are only locally meaningful. Use a wildcard mask to specify the interface to participate in OSPF and join a specific area: network IP_address wildcardjnask area area^to