3Com Switch 8800 Configuration Guide
Chapter 20 Integrated IS-IS Configuration
20-11
Table 20-5
Set the router type
Operation
Command
Set the router type
is-level
{
level-1
|
level-1-2
|
level-2
}
Restore the default router type
undo is-level
By default, the router type is
level-1-2
.
20.2.6 Setting Interface Circuit Level
Perform the following configuration in Interface view.
Table 20-6
Set the interface circuit level
Operation
Command
Set the interface circuit level
isis circuit-level
[
level-1
|
level-1-2
|
level-2
]
Restore the default interface circuit level
undo isis circuit-level
Note:
Only when the router to which the interface belongs is of Level-1-2 type, is the
modification to the interface circuit level meaningful. Otherwise, the type of the router
determines the level of adjacency relation.
You can set the circuit level to limit what adjacency can be established for the interface.
For example, Level-1 interface can only have Level-1 adjacency. Level-2 interface can
only have Level-2 adjacency. For the Level-1-2 router, you can configure some
interfaces to Level-2 to prevent transmitting Level-1 Hello packets to Level-2 backbone
so as to save the bandwidth. However, Level-1 and Level-2 use the same kind of Hello
packet over the
p2p
link, and therefore such setting is unnecessary in this case.
By default, the circuit-level on the interface is
level-1-2
.
20.2.7 Configuring IS-IS to Import Routes of Other Protocols
For IS-IS, the routes discovered by other routing protocols are processed as the routes
outside the routing domain. When importing the routes of other protocols, you can
specify the default cost for them.
When IS-IS imports routes, you can also specify to import the routes to Level-1, Level-2
or Level-1-2.
Perform the following configuration in IS-IS view.
