Avoiding Routing Loops When Forwarding Toward the Internet
A typical enterprise network design uses default routes inside an enterprise, as advertised by an IGP, to draw all Internet traffic toward one or more Internet-connected routers. The Internet-connected routers then forward the traffic into the Internet.
However, as discussed in Chapter 13, in the section “Choosing One Path over Another Using BGP,” routing loops can occur when the Internet-connected routers do not have a direct connection to each other. For example, if the Internet-connected routers sit on opposite sides of the country, the two routers might be separated by several routers internal to the enterprise, because they do not have a direct link.
To show a simple example, the ...
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