3Com Switch 8800 Family Configuration Guide

Configuring Integrated IS-IS 345
The tag argument identifies the IS-IS process. In the present version, just one IS-IS
process is allowed.
By default, the IS-IS routing process is disabled.
Setting Network Entity
Title
Network Entity Titles (hereafter referred to as NETs) defines the current IS-IS area
address and the system ID of the router.
Perform the following configurations in IS-IS view.
The format of the network-entity-title argument is X...X.XXXXXXXXXXXX.XX,
among which the first "X...X" is the area address, the twelve Xs in the middle is
the System ID of the router. The last XX should be 00.
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.
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.
Tab le 308 Enable IS-IS and enter the IS-IS view
Operation Command
Enable the IS-IS and enter the IS-IS view isis [ tag ]
Tab le 309 Set NETs
Operation Command
Set a NET network-entity network-entity-title
Delete a NET undo network-entity network-entity-title
Tab le 310 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 ]