H3C Technologies H3C S12500 Series Switches - Manual (Page 163)

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Configuring basic IS-IS
This section describes the basic settings required for an IS-IS network to run.
Configuration prerequisites
Before the configuration, complete the following tasks:
• Configure the link layer protocol.
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
Enabling IS-IS
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable the IS-IS routing
process and enter its view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
Not enabled by default.
3. Assign a network entity title
(NET).
network-entity net Not assigned by default.
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 ] Disabled by default.
Configuring the IS level and circuit level
If only one area is available, H3C recommends performing the following operations:
• 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 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 } Optional.
The default is Level-1-2.