Learn from the new: the top ten differences between OSPF and OSPF

As we all know, OSPF and OSPF are both dynamic routing protocols. OSPF is widely used because of its high protocol standardization and many manufacturers. The OSPF protocol was invented by Cisco, a leading manufacturer in the network industry, it is also widely recognized by users based on its influence in the industry and its absolute market share. But what are the differences between the two protocols? Next we will sort out the differences between VPN and OSPF. We hope to help you understand the knowledge of VPN and OSPF.

1. VPN is dedicated to cisco, while OSPF is a common protocol.

2. VPN is a distance vector protocol (in some cases, it is a hybrid protocol), while OSPF is a link status protocol.

3. the auto-Summary function is supported by the VPN gateway. It can be automatically summarized at the boundaries of A. B .C network. Manual configuration is also supported. OSPF is not supported, and summary must be manually configured.

4. the convergence speed of the OSPF is faster than that of OSPF, because the optional successor is saved in its topology. When the successor cannot be found directly, it can be directly forwarded through the optional successor.

5. the multicast address of the source node is 224.0.0.10, OSPF is 224.0.0.5, and 224.0.0.6.

6. The path measurement of the ospf is compound, while that of OSPF is Cost (of course, the common cost is calculated based on bandwidth)

7. Although VPN supports route aggregation, it does not have the concept of hierarchical routing, unlike OSPF.

8. in the establishment of the neighbor relationship, the OSPF process is not as complicated as the OSPF down-init-two way process. As long as a router sees the neighbor's hello packet, it establishes an adjacent relationship with it.

9. With regard to the implementation of the aggregation function, VPN can be implemented on any interface of any vro, while OSPF can only be implemented on the ABR and ASBR, and its route aggregation is not based on interfaces.

10. MongoDB supports load balancing with unequal path measurement values, while OSPF only supports load balancing with equal measurement values.

11. VPN uses the DUAL algorithm to calculate the shortest path, and uses a finite state machine (finite-state machine) to track all route information packets, ensuring loop-free) and the selection of subsequent routes. OSPF uses the Dijikstra algorithm to calculate the shortest path. It does not use a finite state machine. If any feasible successor router is available after the neighbor is lost, the feasible successor router will be selected as the successor router immediately. If no, the Query message is sent to each port with a neighbor of the VPN gateway in the multicast mode, except for the original router port, because the Query is RTP, all ACK packets sent back by neighbors will be received within the RTO time-out period. If no ACK packets sent by neighbors are received within RTO, the router will send a Query to the neighbor who does not reply the ACK packet in Unicast mode. Therefore, the first Query is multicast, and the second Query is sent as unicast.

12. when the two parameters match, the K-value and AS number can be used to establish the relationship. However, the establishment of the OSPF relationship requires that multiple parameters comply with hello/dead timer, authentication password, area id, and stub flag.

13. Finally, they are configured and checked (show command) on different, there are many differences in this aspect, it is time to understand. For example, the show ip ospf database in ospf corresponds to the show ip VPN topology in ospf.

Original blog address: http://blog.sina.com.cn/s/blog_4dc21048010088nw.html