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Step Command
Remarks
3.
Assign a NET.
network-entity
net
By default, NET is not assigned.
4.
Return to system view.
quit
N/A
5.
Enter interface view.
interface
interface-type
interface-number
N/A
6.
Enable an IS-IS process on the
interface.
isis enable
[
process-id
]
By default, no IS-IS process is
enabled.
Configuring the IS level and circuit level
Follow these guidelines when you configure the IS level for routers in only one area:
•
Configure the IS level of all routers as Level-1 or Level-2 rather than different levels because the
routers do not need to maintain two identical LSDBs.
•
Configure the IS level as Level-2 on all routers in an IP network for good scalability.
For an interface of a Level-1 (or Level-2) router, the circuit level can only be Level-1 (or Level-2). For an
interface of a Level-1-2 router, the default circuit level is Level-1-2; if the router only needs to form Level-1 (or
Level-2) neighbor relationships, configure the circuit level for its interfaces as Level-1 (or Level-2) to limit
neighbor relationship establishment.
To configure the IS level and circuit level:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
N/A
3.
Specify the IS level.
is-level
{
level-1
|
level-1-2
|
level-2
}
By default, the IS level is Level-1-2.
4.
Return to system view.
quit
N/A
5.
Enter interface view.
interface
interface-type
interface-number
N/A
6.
Specify the circuit level.
isis circuit-level
[
level-1
|
level-1-2
|
level-2
]
By default, an interface can establish
either the Level-1 or Level-2
adjacency.
Configuring P2P network type for an interface
Perform this task only for a broadcast network that has up to two attached routers.
Interfaces with different network types operate differently. For example, broadcast interfaces on a
network must elect the DIS and flood CSNP packets to synchronize the LSDBs, but P2P interfaces on a
network do not need to elect the DIS, and have a different LSDB synchronization mechanism.
If only two routers exist on a broadcast network, configure the network type of attached interfaces as P2P
to avoid DIS election and CSNP flooding, saving network bandwidth and speeding up network
convergence.
