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	<title>CiscoZine &#187; OSPF</title>
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		<title>OSPF Virtual Link</title>
		<link>http://www.ciscozine.com/2009/07/01/ospf-virtual-link/</link>
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		<pubDate>Wed, 01 Jul 2009 11:53:20 +0000</pubDate>
		<dc:creator>Fabio Semperboni</dc:creator>
				<category><![CDATA[Tutorial]]></category>
		<category><![CDATA[Advanced configuration]]></category>
		<category><![CDATA[OSPF]]></category>
		<category><![CDATA[Routing]]></category>
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		<description><![CDATA[The Open Shortest Path First (OSPF) protocol, defined in RFC 2328, is an Interior Gateway Protocol used to distribute routing information within a single Autonomous System. The OSPF protocol is based on link-state technology, which is a departure from the Bellman-Ford vector based algorithms used in traditional Internet routing protocols such as RIP. OSPF has introduced new concepts such as authentication of routing updates, Variable Length Subnet Masks (VLSM), route summarization, and so forth. An OSPF network can be divided into sub-domains called areas. An area is a logical collection of OSPF networks, routers, and links that have the same [...]]]></description>
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