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Catalyst 3560 Switch Software Configuration Guide
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Chapter 30 Configuring IP Unicast Routing
Configuring IGRP
Figure 30-4 Interior, System, and Exterior Routes
By default, a router running IGRP sends an update broadcast every 90 seconds and declares a route
inaccessible if it does not receive an update from the first router in the route within three update periods
(270 seconds). After seven update periods (630 seconds), the route is removed from the routing table.
This section briefly describes how to configure IGRP. It includes this information:
• Default IGRP Configuration, page 30-24
• Understanding Load Balancing and Traffic Distribution Control, page 30-25
• Configuring Basic IGRP Parameters, page 30-26
• Configuring Split Horizon, page 30-27
Note To enable IGRP, the switch must be running the EMI.
Default IGRP Configuration
Table 30-5 shows the default IGRP configuration.
Router
System
Subnet A
Subnet B
Interior
46649
Exterior
Autonomous system 1
Autonomous
system 2
Router Router
Table 30-5 Default IGRP Configuration
Feature Default Setting
IP split horizon Varies with media.
Metric holddown Disabled.
Metric maximum-hops 100 hops.
Neighbor None defined.
Network None specified.
Offset-list Disabled.
Set metric None set in route map.
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