OSPF (Open Shortest Path First) is an Interior Gateway Protocol (IGP). It is a link-state routing protocol that uses the Shortest Path First (SPF) algorithm to calculate the best route.

To configure OSPF, we need to enable OSPF on both routers first. Then we need to define what network will be advertised in OSPF using the following sequence of commands on both routers:

CCNA students need to understand how OSPF works but also how to configure it. If you have no idea what OSPF is or if you are a little fuzzy, I recommend you to read my Introduction to …

2017年5月4日 · OSPF（Open Shortest Path First，开放最短路径优先）是一个被各厂商设备广泛支持的链路状态路由协议。 OSPF执行IETF标准，IETF标准被不同厂商的设备所支持；执行SPF算法，不会产生环路；支持VLSM和CIDR；可以用于大型网络；层次型设计，易扩展；区域化设计，减小路由更新给设备带来的负担；快速收敛，使用触发式更新；支持针对区域和链路的验证。 执行OSPF的路由默认每隔30分钟会泛洪一次链路状态通告 (LSA)，称为链路状态刷新（并非周 …

Confidently configure OSPF on Cisco devices, including using passive interfaces, default routes, and OSPF metrics. Troubleshoot common OSPF issues with real-world troubleshooting scenarios. Explore advanced OSPF topics like OSPF authentication, multi-area OSPF, and OSPF route types (E1, E2).

2020年4月28日 · process-id是在同一台路由器上标记不同的OSPF 进程，同一台路由器上可以启用多个OSPF 协议，只具有本地意义，不影响其他路由器，也不影响邻居关系的建立。

In part 1 of this chapter, we will review concepts on link-state routing protocols and learn how they work. We will then look at the OSPF packets and discuss the algorithm that OSPF uses to find the best part. We will then configure OSPF in a single area and finally we will learn some of the commands that can be used to verify OSPF.

2024年11月17日 · OSPF stands for Open Shortest Path First. It is described in RFC 2328. It is an open standard routing protocol. It dynamically learns all network paths, selects the best path for every subnet, and adds that to the routing table. It uses path cost to compare and choose the shortest path from all available paths. OSPF is based on open standards.

This article lists the summary of the most important Open Shortest Path First (OSPF) routing protocol features.

2020年4月24日 · OSPF Open Shortly Path First，开放最短路径优先选择，是一个企业级的（IGP Interior Gateway Protocol ）高级路由协议，open代表是开放，公有的。 是Link-State-Routing-Protocols，链路状态型协议。 距离矢量型里有协议是个基于“谣言”的路由协议，因为不同的路由器之间相互交换的路由信息（怎么样到达目标网络）全部都靠邻居告诉，所有的路由协议都是靠别人判断，而且每个路由器不一定有保存全网的信息。 而链路状态型协议，他的路由选择是每个 …