Migration of Routing Protocols

Routing-protocol migration can be divided into three categories:

  • Migrating from a classful distance-vector protocol, such as RIP or IGRP, to a classless link-state protocol, such as OSPF or IS-IS

  • Migrating a classful distance vector to a classless advanced distance vector, such as Enhanced IGRP

  • Migrating customer routes from the IGP of an ISP to BGP

Each of these migration scenarios is discussed fully in the following sections.

Classful Distance-Vector to Link-State Protocol

For the sake of this discussion, imagine you are migrating from IGRP, which is the classful distance-vector protocol, to a link-state protocol, OSPF. Remember that both OSPF and IS-IS require hierarchy. The network in Figure 12-2 shows that ...

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