3Com Switch 8800 Configuration Guide
Chapter 20 Integrated IS-IS Configuration
20-10
20.2.3 Enabling IS-IS on the Specified Interface
After enabling IS-IS, you need to specify on which Interfaces the IS-IS will be run.
Perform the following configuration in interface view.
Table 20-3
Enable IS-IS on the specified interface
Operation
Command
Enable IS-IS on the specified Interface
isis enable
[
tag
]
Cancel this designation
undo
isis enable
[
tag
]
20.2.4 Setting Priority for DIS Election
In the broadcast network, the IS-IS needs to elect a DIS from all the routers.
When you need to select a DIS from the IS-IS neighbors on the broadcast network, you
should select level-1 DIS and level-2 DIS respectively. The higher the priority is, the
more possible it is selected. If there are two or more routers with the highest priority in
the broadcast network, the one with the greatest MAC address will be selected. If all the
adjacent routers' priorities are 0, the one with the greatest MAC address will be
selected.
The DISs of Level-1 and Level-2 are elected separately. You can set different priorities
for DIS election at different levels.
Perform the following configuration in interface view.
Table 20-4
Set priority for DIS election
Operation
Command
Set the priorities for DIS election on the
interface
isis dis-priority value
[
level-1
|
level-2
]
Restore the default priorities for DIS
election on the interface
undo isis dis-priority
[
level-1
|
level-2
]
By default, the interface priority is 64. If the level is not specified, it defaults to setting
the priority of Level-1.
20.2.5 Setting Router Type
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.
