Ccnp route • 1. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1 www.professordkinney.com • CCNP ROUTE 08/02/13 Instructional Design-Computer Networking - Bridges Educational Group • IGRP (Interior Gateway Routing Protocol) IGRP is a Cisco-proprietary Distance-Vector protocol, designed to be more scalable than RIP, its standardized counterpart. IGRP adheres to the following Distance-Vector characteristics: • IGRP sends out periodic routing updates (every 90 seconds). • IGRP sends out the full routing table every periodic update. • IGRP uses a form of distance as its metric (in this case, a composite of bandwidth and delay).

• IGRP uses the Bellman-Ford Distance Vector algorithm to determine the best “path” to a particular destination. IGRP uses Bandwidth and Delay of the Line, by default, to calculate its distance metric.

Reliability, Load, and MTU are optional attributes that can be used to calculate the distance metric. 08/02/13 Instructional Design-Computer Networking - Bridges Educational Group CCNP ROUTE • Configuring IGRP 08/02/13 Instructional Design-Computer Networking - Bridges Educational Group Routing protocol configuration occurs in Global Configuration mode. On Router A, to configure IGRP, we would type: Router(config)# router igrp 10 Router(config-router)# network 172.16.0.0 Router(config-router)# network 172.17.0.0 The first command, router igrp 10, enables the IGRP process. The “10” indicates the Autonomous System number that we are using. Only other IGRP routers in Autonomous System 10 will share updates with this router. CCNP ROUTE • The network statements tell IGRP which networks you wish to advertise to other RIP routers. We simply list the networks that are directly connected to our router.

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Notice that we specify the networks at their classful boundaries,and we do not specify a subnet mask.