O'Reilly logo

Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Fundamentals of On-Demand Routing

Although the configuration of static routes is simple in a hub router such as the one in Figure 12.1, many network administrators still see static routes as administratively undesirable. The difficulty is not so much adding routes as new stub networks are brought online, as it is remembering to remove routes when stub networks or stub routers are taken offline. Beginning with IOS 11.2, Cisco offers a proprietary alternative for hub routers called On-Demand Routing (ODR).

With ODR a hub router can automatically discover stub networks while the stub routers still use a default route to the hub. ODR conveys address prefixes—that is, only the network portion of the address—rather than the entire address—so VLSM ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required