Configuration Tasks for IS-IS
The following describes the configuration tasks for IS-IS.
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Enabling IS-IS
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Configure Multi-Topology IS-IS (MT IS-IS)
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Configuring IS-IS Graceful Restart
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Changing LSP Attributes
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Configuring the IS-IS Metric Style
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Configuring IS-IS Cost
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Changing the IS-Type
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Controlling Routing Updates
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Configuring Authentication Passwords
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Setting the Overload Bit
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Debuging IS-IS
Enabling IS-IS
By default, IS-IS is not enabled.
The system supports one instance of IS-IS. To enable IS-IS globally, create an IS-IS routing process and assign a NET address. To exchange
protocol information with neighbors, enable IS-IS on an interface, instead of on a network as with other routing protocols.
In IS-IS, neighbors form adjacencies only when they are same IS type. For example, a Level 1 router never forms an adjacency with a Level 2
router. A Level 1-2 router forms Level 1 adjacencies with a neighboring Level 1 router and forms Level 2 adjacencies with a neighboring Level
2 router.
NOTE:
Even though you enable IS-IS globally, enable the IS-IS process on an interface for the IS-IS process to exchange
protocol information and form adjacencies.
To configure IS-IS globally, use the following commands.
1
Create an IS-IS routing process.
CONFIGURATION mode
router isis [tag]
tag: (optional) identifies the name of the IS-IS process.
2
Configure an IS-IS network entity title (NET) for a routing process.
ROUTER ISIS mode
net network-entity-title
Specify the area address and system ID for an IS-IS routing process. The last byte must be 00.
For more information about configuring a NET, refer to
3
Enter the interface configuration mode.
CONFIGURATION mode
interface interface
Enter the keyword interface then the type of interface and slot/port information:
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For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port[/subport] information.
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Intermediate System to Intermediate System
IS-IS
Addressing.