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Lectures notes for 2010 - KTH

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Resulting BGP Architecture<br />

AS1<br />

AS2<br />

E-BGP<br />

AS3<br />

I-BGP<br />

E-BGP<br />

E-BGP<br />

AS4<br />

AS5<br />

Figure 12: BGP architecture<br />

Two kinds of BGP sessions:<br />

• External (E-BGP) coordinates between border routers between ASs<br />

• Internal BGP (I-BGP) coordinates between BGP peers within an AS<br />

• Note it must be a full mesh, but this does not scale ⇒ organization into subASs, … .<br />

Maguire Resulting BGP Architecture 7: 45 of 70<br />

maguire@kth.se <strong>2010</strong>.03.21 Internetworking/Internetteknik

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