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Policy Framework Configuration Guide - Juniper Networks

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Chapter 4: Routing <strong>Policy</strong> <strong>Configuration</strong><br />

policy-statement export-exact {<br />

term a {<br />

from {<br />

protocol bgp;<br />

route-filter 201:db8::8000/32 exact;<br />

}<br />

then {<br />

accept;<br />

}<br />

}<br />

term b {<br />

then {<br />

reject;<br />

}<br />

}<br />

}<br />

Example: Using Routing <strong>Policy</strong> in an ISP Network<br />

This section provides an example of how policies might be used in a typical Internet<br />

service provider (ISP) network. In this network example (see Figure 11 on page 83), the<br />

ISP’s AS number is 1000. The ISP has two transit peers (AS 11111 and AS 22222) to which<br />

it connects at an exchange point. The ISP is also connected to two private peers (AS 7000<br />

and AS 8000) with which it exchanges specific customer routes. The ISP has two<br />

customers (AS 1234 and AS 2468) to which it connects using BGP.<br />

Figure 11: ISP Network Example<br />

Copyright © 2010, <strong>Juniper</strong> <strong>Networks</strong>, Inc.<br />

83

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