Advantages of RIP, OSPF, and IS-IS

The biggest advantage of using RIP is that it is relatively simple to understand and to implement, and it has been the de facto routing standard for many years.

RIP has a number of limitations that can cause problems in large networks, including the following:
  • A limit of 15 hops between the source and destination networks

  • A large amount of bandwidth taken up by periodic broadcasts of the entire routing table

  • Slow convergence

  • Routing decisions based on hop count; no concept of link costs or delay

  • Flat networks; no concept of areas or boundaries

OSPF and IS-IS offer many advantages over RIP, including the following:
  • No limitation on hop count

  • Route updates multicast only when changes occur

  • Faster convergence

  • Support for load balancing to multiple routers based on the actual cost of the link

  • Support for hierarchical topologies where the network is divided into areas

The details of RIP are explained later in this chapter.