3Com 8807 Configuration Manual page 346

346 C 32: I
HAPTER NTEGRATED
Setting Router Type
Setting Interface Circuit
Level
n
Configuring IS-IS to
Import Routes of Other
Protocols
IS-IS C
ONFIGURATION
Table 311 Set priority for DIS election
Operation
Set the priorities for DIS election on the
interface
Restore the default priorities for DIS election
on the interface
By default, the interface priority is 64. If the level-1 or level-2 is not specified, it
defaults to setting the priority of Level-1.
Based upon the position of the router, the levels can be divided into Level-1
(intra-domain router), Level-2 (inter-domain router) and Level-1-2 (that is,
intra-domain router as well as inter-domain router).
Perform the following configuration in IS-IS view.
Table 312 Set the router type
Operation
Set the router type
Restore the default router type
By default, the router type is level-1-2.
Perform the following configuration in Interface view.
Table 313 Set the interface circuit level
Operation
Set the interface circuit level
Restore the default interface circuit level
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.
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.
Command
isis dis-priority value [ level-1 | level-2 ]
undo isis dis-priority [ level-1 | level-2 ]
Command
is-level { level-1 | level-1-2 | level-2 }
undo is-level
Command
isis circuit-level [ level-1 | level-1-2 | level-2 ]
undo isis circuit-level