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Extra info for Cisco - Deploying OSPF, NLSP, IS-IS 308
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Printed in USA. scr 116 58 Default Metrics • The first, or seed, metric for a route is derived from being directly connected to a router interface Re-distributed routes are not physically connected “Default-metric” establishes the seed metric for the route 308 1037_05F9_c2 © 1999, Cisco Systems, Inc. ) • Once a compatible metric is established, the metric can increment just like any other route • Set default metric bigger than the biggest native metric 308 1037_05F9_c2 © 1999, Cisco Systems, Inc.
Involve the appropriate administrators 308 1037_05F9_c2 © 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.
97 Reasons for Conversion • Introduce a modern protocol VLSM-capable Reduce routing overhead Faster convergence Better metrics • Assimilation of an existing network Resistance is futile 308 1037_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 98 49 Technical Assessment Items • What Cisco IOS™ version(s) are installed? At what version did the protocol you’re interested become ready for prime time? • Hardware platform(s)’s capabilities, such as CPU and memory The newer protocols typically consume more memory Older protocols had a linear CPU utilization Most new protocols consume more CPU during convergence 308 1037_05F9_c2 99 © 1999, Cisco Systems, Inc.