H3C Technologies H3C S5560 Series Switches - Manual (Page 157)

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Step Command Remarks
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. This will
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. However, 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.
To configure P2P network type for an interface: