Large-Scale IP Network Solutions (CCIE Professional Development)
by Khalid Raza - CCIE, Mark Turner
Summary
As classful routing protocols become outdated and no longer useful in large networks, it is often necessary to replace them with newer, classless protocols. There are several reasons for exchanging one protocol for another, which include support for VLSM and discontiguous networks, address space, allowing faster convergence, summarizing within a network, and improved scaling.
There are three categories of protocol migration: migrating from a classful distance vector protocol (RIP, IGRP) to a classless link-state protocol (OSPS, IS-IS); classful distance vector to classless advanced distance vector (EIGRP); and, in the case of ISP's, migrating customer routes from the IGP of an ISP to BGP.
When migrating from RIP or IGRP to OSPF, the ...
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