Chapter 5. Optimizing Routing

There are times when you need to go beyond just turning on a routing protocol in your network. You may need to use multiple protocols, control exactly which routes are advertised or redistributed, or which paths are chosen. Most networks use DHCP; your router may need to be a DHCP server, or relay DHCP broadcasts.

Using Multiple Routing Protocols

There are several reasons you may need to run multiple routing protocols in your network. Some include:

  • Migrating from one routing protocol to another, where both protocols will run in the network temporarily

  • Applications that run under certain routing protocols but not others

  • Areas of the network under different administrative control (“layer 8” issues)

  • A multi-vendor environment ...

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