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Extra info for Cisco - Deploying OSPF, NLSP, IS-IS 308
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 118 59 Configuring Default Metrics default-metric bandwidth delay reliability loading mtu • Used for IGRP and Enhanced IGRP redistribution default-metric bandwidth delay reliability loading mtu • Used for OSPF, RIP, EGP, and BGP redistribution 308 1037_05F9_c2 © 1999, Cisco Systems, Inc. 119 Route Redistribution • Different protocols use different metrics • Metrics are difficult to compare algorithmically • Therefore, a collating sequence Which protocol do you believe the most?
All rights reserved. Printed in USA. ) 308 1037_05F9_c2 93 © 1999, Cisco Systems, Inc. Comparison of Routing Protocols Link State Traditional Distance Vector Advance Distance Vector Scalability Good Low Excellent Bandwidth Low High Low Memory High Low Moderate CPU High Low Low Convergence Fast Slow Fast Configuration Moderate Easy Easy 308 1037_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 94 47 OSPF Comparison 400 350 Update 60 Dead Interval 50 300 Update Overhead 40 250 200 30 150 20 100 10 50 0 EIGRP OSPF Broadcast Broadcast EIGRP NBMA OSPF NBMA 0 Worst-Case Convergence 308 1037_05F9_c2 EIGRP OSPF Broadcast Broadcast EIGRP NBMA OSPF NBMA Bandwidth Overhead 95 © 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 102 51 Ground Rules • Under normal operation, there should be exactly one interior routing protocol on any network segment Use “passive-interface” as necessary to ensure this • The number of re-distribution boundaries should be kept to a minimum You have better things in life to do besides build access lists 308 1037_05F9_c2 © 1999, Cisco Systems, Inc. ) • Addressing should be contiguous with respect to topology Not just network topology but routing protocol topology Allows for summarization If you’ve any piece of a classfull protocol left, you must keep major network prefixes contiguous and non-VLSM 308 1037_05F9_c2 © 1999, Cisco Systems, Inc.