Cisco - Deploying EIGRP, IGRP 307

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Printed in USA. scr 62 31 Agenda • • • • • • • 307 0978_05F9_c2 Fundamentals of EIGRP DUAL Summarization and Load Balancing EIGRP/IGRP Interaction Query Process Deployment Guidelines with EIGRP Summary 63 © 1999, Cisco Systems, Inc. EIGRP Query Process • EIGRP is Advanced Distant Vector. It relies on its neighbor to provide routing information Have You Seen My Sparky? • If a route is lost and no feasible successor is available, EIGRP needs to converge fast, its only mechanism for fast convergence is to actively query for the lost route to its neighbors 307 0978_05F9_c2 © 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 64 32 EIGRP Query Process • Queries are sent out when a route is lost and no feasible successor is available • The lost route is now in active state • Queries are sent out to all of its neighbors on all interfaces except the interface to the successor • If the neighbor does not have the lost route information, queries are sent out to their neighbors 307 0978_05F9_c2 © 1999, Cisco Systems, Inc. 65 EIGRP Query Process • The router will have to get ALL of the replies from the neighbors before the router calculates the successor information • If any neighbor fails to reply the query in three minutes, this route is stuck in active and the router reset the neighbor that fails to reply • Solution is to limit query range to be covered later in presentation 307 0978_05F9_c2 © 1999, Cisco Systems, Inc.

Scr 88 44 307 0978_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

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