Users Guide

• Conguring IS-IS Graceful Restart
• Changing LSP Attributes
• Conguring the IS-IS Metric Style
• Conguring IS-IS Cost
• Changing the IS-Type
• Controlling Routing Updates
• Conguring Authentication Passwords
• Setting the Overload Bit
• 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 congure IS-IS globally, use the following commands.
1 Create an IS-IS routing process.
CONFIGURATION mode
router isis [tag]
tag: (optional) identies the name of the IS-IS process.
2 Congure 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 conguring a NET, refer to IS-IS Addressing.
3 Enter the interface conguration mode.
CONFIGURATION mode
interface interface
Enter the keyword interface then the type of interface and slot/port information:
• For a 1-GigabitEthernet interface, enter the keyword GigabitEthernet then the slot/port information.
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
• For a Loopback interface, enter the keyword loopback then a number from 0 to 16383.
• For a port channel interface, enter the keywords port-channel then a number.
• For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
4 Enter an IPv4 Address.
INTERFACE mode
ip address ip-address mask
Assign an IP address and mask to the interface.
Intermediate System to Intermediate System
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