342 CHAPTER 29: IS-IS CONFIGURATION
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If a router’s type is configured as Level-1 or Level-2, the type of interfaces must be
the same, which cannot be changed using the isis circuit-level command.
However, an interface’s type can be changed with this command when the
router’s type is Level-1-2 for the establishment of a specific level adjacency.
Configuring IS-IS
Routing Information
Control
Configuration
Prerequisites
Before the configuration, accomplish the following tasks first:
■ Configure an IP address on each interface, and make sure all nodes are
reachable.
■ Configure basic IS-IS functions
Specifying a Priority for
IS-IS
A router can run multiple routing protocols. When a route to the same destination
is learned by multiple routing protocols, the one with the highest protocol priority
wins. You can reference a routing policy to specify a priority for specific routes. For
information about routing policy, refer to “Routing Policy Configuration” on page
415.
Follow these steps to configure the IS-IS protocol priority.
Assign a network entity title
(NET)
network-entity net Required
Not assigned by default
Specify a router type is-level { level-1 | level-1-2 |
level-2 }
Optional
The default type is level-1-2.
Return to system view quit --
Enter interface view interface interface-type
interface-number
--
Enable an IS-IS process on the
interface
isis enable [ process-id ] Required
Disabled by default
Specify network type for the
interface as P2P
isis circuit-type p2p Optional
By default, the network type
of an interface depends on
the physical media. The
network type of a VLAN
interface is broadcast.
Specify the adjacency type for
the interface
isis circuit-level [ level-1 |
level-1-2 | level-2 ]
Optional
The default type is level-1-2.
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Specify a priority for IS-IS preference { route-policy
route-policy-name | preference } *
Optional
15 by default
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