📄 c-drp1.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><link rel="STYLESHEET" type="text/css" href="wrs.css"><title> Dynamic Routing Protocols </title></head><body bgcolor="FFFFFF"><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-drp.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-drp.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-drp.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-drp2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p><font face="Helvetica, sans-serif" class="sans"><h3 class="H2"><i><a name="94281">6.1 Introduction</a></i></h3></font><dl class="margin"><dl class="margin"><dd><p class="Body"><a name="88437"> </a>VxWorks retrieves routing information by searching for it in a routing table. To set up and manage this table manually, use the routines <b class="routine"><i class="routine">routeAdd</i></b><b>( )</b> or <b class="routine"><i class="routine">mRouteAdd</i></b><b>( )</b>. However, because the network environment is constantly in flux, the information in the routing table grows obsolete as machines join or leave the network. To update the routing table dynamically, VxWorks supports two protocols: </p></dl><dl class="margin"><ul class="BulletSingle" type="disc"><li><a name="88438"> </a>RIP (Routing Information Protocol) </li></ul><ul class="BulletSingle" type="disc"><li><a name="88439"> </a>OSPF (Open Shortest Path First) </li></ul></dl><dl class="margin"><dd><p class="Body"><a name="88441"> </a>RIP, the older and simpler protocol, comes bundled with VxWorks, and is intended for small to medium-sized networks. OSPF is a separately purchasable option for use with VxWorks. OSPF is superior to RIP in many ways. For example, OSPF is a link-state protocol, not a distance-vector protocol, like RIP. The messages from a <i class="term">distance-vector protocol</i> contain a vector of distances (a hop count). Each router uses these distance-vectors to update its routing tables. </p><dd><p class="Body"><a name="88444"> </a>A router running a <i class="term">link-state protocol</i>, such as OSPF, is more active about getting the information it needs. An OSPF router actively tests the status of its links to its neighbors, and then shares this information with other OSPF routers. One result of this more active approach is faster network stabilization after a change, such as the loss of a router or a link. Unfortunately, this enhanced stabilization comes at the price of increased complexity. As a result, it requires considerably more thought to configure OSPF correctly. </p></dl></dl><a name="foot"><hr></a><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-drp.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-drp.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-drp.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-drp2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p></body></html><!---by WRS Documentation (), Wind River Systems, Inc. conversion tool: Quadralay WebWorks Publisher 4.0.11 template: CSS Template, Jan 1998 - Jefro --->⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -