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Catalyst 3750 MetroSwitch Software Configuration Guide
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Chapter 28 Configuring IP Unicast Routing
Configuring ISO CLNS Routing
Routers establish Level 1 adjacencies to perform routing within a local area (station routing). Routers
establish Level 2 adjacencies to perform routing between Level 1 areas (area routing).
A single Cisco router can participate in routing in up to 29 areas and can perform Level 2 routing in the
backbone. In general, each routing process corresponds to an area. By default, the first instance of the
routing process configured performs both Level 1and Level 2 routing. You can configure additional
router instances, which are automatically treated as Level 1 areas. You must configure the parameters
for each instance of the IS-IS routing process individually.
For IS-IS multiarea routing, you can configure only one process to perform Level 2 routing, although
you can define up to 29 Level 1 areas for each Cisco unit. If Level 2 routing is configured on any process,
all additional processes are automatically configured as Level 1. You can configure this process to
perform Level 1 routing at the same time. If Level 2 routing is not desired for a router instance, remove
the Level 2 capability using the is-type global configuration command. Use the is-type command also
to configure a different router instance as a Level 2 router.
Note For more detailed information about IS-IS, refer to the “IP Routing Protocols” chapter of the Cisco IOS
IP and IP Routing Configuration Guide for Release 12.1. For complete syntax and usage information for
the commands used in this section, refer to the Cisco IOS IP and IP Routing Command Reference for
Release 12.1.
This section briefly describes how to configure IS-IS routing. It includes this information:
• Default IS-IS Configuration, page 28-67
• Enabling IS-IS Routing, page 28-68
• Configuring IS-IS Global Parameters, page 28-70
• Configuring IS-IS Interface Parameters, page 28-72
Default IS-IS Configuration
Table 28-14 shows the default IS-IS configuration.
Table 28-14 Default IS-IS Configuration
Feature Default Setting
Ignore link-state PDU (LSP) errors Enabled.
IS-IS type Conventional IS-IS: the router acts as both a Level 1 (station) and a Level 2
(area) router.
Multiarea IS-IS: the first instance of the IS-IS routing process is a Level 1-2
router. Remaining instances are Level 1 routers.
Default-information originate Disabled.
Log IS-IS adjacency state changes. Disabled.
LSP generation throttling timers Maximum interval between two consecutive occurrences: 5 seconds.
Initial LSP generation delay: 50 ms.
Hold time between the first and second LSP generation: 5000 ms.
LSP maximum lifetime (without a refresh) 1200 seconds (20 minutes) before t.he LSP packet is deleted.
LSP refresh interval Send LSP refreshes every 900 seconds (15 minutes).
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