CCNA 200-301 - OSPFv2 Troubleshoot Basics - 200-301

CCNA 200-301 – OSPFv2 Troubleshoot Basics


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Open Shortest Path First (OSPF)

Open Shortest Path First (OSPF) is an open standard routing protocol that’s been implemented by a wide variety of network vendors, including Cisco. If you have routers from different vendors then you can’t use EIGRP. So your remaining CCNA objective options are basically RIP, RIPv2, and OSPF. If it’s a large network, then, really, your only options are OSPF and something called route redistribution-a translation service between routing protocols that we discussed earlier in this chapter.

OSPF works by using the Dijkstra algorithm. First, a shortest path tree is constructed, and then the routing table is populated with the resulting best paths. OSPF converges quickly, although perhaps not as quickly as EIGRP, and it supports multiple, equal-cost routes to the same destination. Like EIGRP, it does support both IP and IPv6 routed protocols.

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