The process ID is the ID of the OSPF process to which the interface belongs. The process ID is local to the router, and two OSPF neighboring routers can have different OSPF process IDs. (This is not true of Enhanced Interior Gateway Routing Protocol [EIGRP], in which the routers need to be in the same autonomous system). Cisco IOS® Software can run multiple OSPF processes on the same router, and the process ID merely distinguishes one process from the another. The process ID should be a positive integer. In this example, the process ID is 1.
hai, can anyone help me to know the use of process id in ospf...?
The OSPF process id is locally significant on the router. Unlike EIGRP for example, the process id does not have to match between 2 neighbors for a neigborship to establish.
You can run multiple OSPF processes on the same physical router and the process id would be how the router distinguishes between the processes. Also when redistributing OSPF into another routing protocol you need to specify the process id.
Note that running multiple OSPF processes on the same router is not normally recommended as OSPF can be quite heavy on the router rseources.
In complex routing architectures you might want to have two (or more) completely seperate OSPF routing processes, one serving one set of interfaces and one serving a different set of interfaces. These processes can be distinguished by means of the process id. They will operate entirely independently of each other (unless you choose to redistribute routes between them), and will hold completely seperate link-state databases. They will pass "like ship in the night" without any interference from each other.
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