Describe Intra-AS routing in the Internet.
Describe Intra-AS routing in the Internet.
The Internet consists of interconnected autonomous systems (ASs). An AS typically consists of many networks, where a network (also called an IP network).The administrator of an autonomous system chooses the intra-AS routing algorithm for that AS, and is responsible for administering that AS and no others.
An intra-AS routing protocol is used to configure and maintain the routing tables within an autonomous system (AS). Once the routing tables are configured, datagrams are routed within the AS as described in the previous section. Inter-AS routing protocols are also known as interior gateway protocols. Historically, three routing protocols have been used extensively for routing within an autonomous system in the Internet: RIP (the Routing Information Protocol), and OSPF (Open Shortest Path First), and IGRP (Cisco’s propriety Interior Gateway Routing Protocol).
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