OSPF (OpenShortedPathFirst): a dynamic link routing supporting OSPF (Open Shorted Path First ):
Is a dynamic link route that supports VLSM (variable-length mask transfer ). The multicast method is used only when the link changes, and the cost is used for routing. Create a database for all links and use the shortest path algorithm to determine each route. the convergence speed is fast and there is no limit on the number of hops.
The 8th-bit MAC address of Physical Multicast is 1, indicating physical multicast. The IP multicast address is 224.0.0.5.
The default hop count of OSPF is 110. the default hop count of RIP is 120.
RIP. route protocol
It is a simple routing protocol that uses the number of hops for routing. Broadcast is used to send your route table, which is usually broadcast every 30 s. Each time, all route information is broadcast. R1_1 does not support vlsm rip v2. Slow convergence speed.
SA indicates an autonomous system. In this system, a routing protocol is used. the autonomous system divides different areas. Area is divided into backbone areas, non-backbone areas. The number of the backbone area is 0.
Router_Id: the vro ID that uniquely identifies the OSPF region. You can select it as needed.
Steps for configuring OSPF on a vro:
1: enable the OSPF service on the vro and enter the configure mode: router ospf process_id (process ID of ospf in the vro, which can be selected randomly)
2: router_id 192.1.1.1 specifies the unique identifier of the router in OSPF. It can be selected as needed, without practical significance.
3: network 192.168.10.0 0.0.0.255 area 0 enable the OSPF routing protocol for the port network number of the router.
Note! It is the network number, not the IP address of the port.
View route information:
1: show ip route to view route table information.
2: show ip protocols to view the neighbor list and its status.
3: show ospf viewing ospf configuration
4: show ip ospf interface type number to view the data structure of the ospf interface.
5: In privileged mode, clear ip ospf process clears all OSPF configurations.
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