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hello protocol
ospf protocol topology
ospf header format
spf tree
ospf router roles
size of ospf header
ospf message format
ospf messages
OSPF Basic Topology and the Link State Database (LSDB) (Page 1 of 3). OSPF is designed to facilitate routing in both smaller and larger autonomous systems (ASes). To this end, the protocol supports two topologies. When there is only a small number of routers, the entire AS is managed as a single entity. This doesn't
TCP/IP Routing Protocols (Gateway Protocols). Routing is not just one of the most important activities that takes place at the network layer: it is the function that really defines layer three of the OSI Reference Model. Routing is what enables small local networks to be linked together to form potentially huge internetworks that
Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4.
EIGRP is still a distance-vector protocol, but is more sophisticated than other distance-vector protocols like IGRP or RIP, and includes certain features that are more often associated with link-state routing protocols like OSPF than distance-vector algorithms. Also, since Cisco realized many of the organizations deciding to use
To solve this problem, a new routing protocol was developed in the late 1980s that uses the more capable (and more complex) link-state or shortest path first routing algorithm. This protocol is called Open Shortest Path First (OSPF). It fixes many of the issues with RIP and allows routes to be selected dynamically based on
Table 128: OSPF Database Description Message Format. Field Name. Size (bytes). Description. Interface MTU. 2. Interface MTU: The size of the largest IP message that can be sent on this router's interface without fragmentation. Options. 1. Options: Indicates which of several optional OSPF capabilities the router supports.
OSPF Hierarchical Topology, Areas and Router Roles (Page 1 of 3). When the number of routers in an autonomous system (AS) is relatively small, using the basic topology described in the previous topic works well. Each router maintains a common picture of the network topology in the form of an identical link-state
The key data structure maintained by each router in an OSPF autonomous system (AS) is the link-state database (LSDB). The LSDB contains a representation of the topology of either the entire AS (in basic topology) or a single area (in hierarchical topology). As we have seen earlier in this section, each router in the AS or
OSPF General Operation and Message Types (Page 1 of 2). As a routing protocol, the main job of OSPF is to facilitate the exchange of routing information between routers. Each router in an OSPF autonomous system that runs OSPF software that is responsible for various tasks, such as setting timers to control certain
OSPF Overview, History, Standards and Versions (Page 1 of 2). In the early days of TCP/IP, the Routing Information Protocol (RIP) became the standard protocol for routing within an autonomous system (AS), almost by default. RIP had two big things going for it: it was simple and easy to use, and it was included in the
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