Route redistribution
In a router, route redistribution allows a network that uses one routing protocol to route traffic dynamically based on information learned from another routing protocol.
Overview
On the Internet, routers forward data packets between computer networks.[1][2] In order a router to determine where to forward each packet, it may use:
- default or static routes that are manually configured,[3][4]
- on-demand routing,[5]
- dynamic routing protocols[6], or
- Policy-based routing.[7]
In a small network such as a home or home office, a default route is often used to send all traffic to the user's Internet service provider. Likewise, medium-sized networks such as branch offices or small Internet service providers may use default routes for traffic intended for the public Internet. But in medium-sized and large networks, routers use dynamic routing protocols to determine the best paths to various network destinations.
Sometimes, a network may use more than one dynamic routing protocol, for example, if two different companies merge or if networking devices from multiple vendors are used.[8] In such networks, it is often useful to redistribute information from one routing protocol into another.[9]
Network design
Metrics and administrative distance
Problems associated with redistribution of routes
Preventing routing loops
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References
- ^ Leeds City College, CCNA – Routing Protocols and Concepts, http://www.leedscitycollege.ac.uk/courses/index.php/3260/ccna-routing-protocols-and-concepts/ (Nov. 16, 2010).[dead link]
- ^ Diane Teare, Implementing Cisco IP Routing (ROUTE): Foundation Learning Guide 22 (Cisco Press, Mar. 2013)
- ^ Teare, Implementing Cisco IP Routing (ROUTE) at 22–25
- ^ Cisco Systems, Inc., Configuring a Gateway of Last Resort Using IP Commands, http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/16448-default.html (last updated Aug. 10, 2005).
- ^ Teare, Implementing Cisco IP Routing (ROUTE) at 28–29
- ^ Id. at 26–28.
- ^ Id. at ch. 5.
- ^ Cisco Systems, Inc., Redistributing Routing Protocols, http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8606-redist.html (last updated Mar. 22, 2012).
- ^ Teare, Implementing Cisco IP Routing (ROUTE) at 330.
External links
- David Davis, Cisco administration 101: Routing redistribution, http://www.techrepublic.com/article/cisco-administration-101-routing-redistribution (Dec. 8, 2005).
- Cisco Systems, Inc., Configuring a Gateway of Last Resort Using IP Commands, http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/16448-default.html (last updated Aug. 10, 2005).