3Com Switch 7750 Configuration Guide

IS-IS Basic Configuration 335
higher priority a DIS has, the more likely it is to be chosen. If two or more routers
with the highest priorities exist on the broadcast network, the router that has the
greatest MAC address will be chosen. For adjacent routers that have the same
priority of 0, the router that has the greatest MAC address will still be chosen.
Level-1 DIS and Level-2 DIS are selected respectively. You can set different priorities
for DISs at different levels to be selected.
Configuring Router Type
n
Changing interface line type makes sense only when the interface is on a Level-1-2
router. Otherwise, the router type determines the adjacency hierarchy that can be
established.
Configuring the Line
Type of an Interface
n
Changing interface line type makes sense only when the interface is on a Level-1-2
router. Otherwise, the router type determines the adjacency hierarchy that can be
established.
Configuring IS-IS Route
Redistribution
IS-IS processes the routes discovered by other routing protocols as routes outside a
routing domain. You can specify the default cost for IS-IS to redistribute routes
from another routing protocol.
You can configure IS-IS to redistribute routes to Level-1, Level-2, and Level-1-2.
Table 255 Configure DIS priority
Operation Command Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Assign a DIS priority isis dis-priority value
[ level-1 | level-2 ]
Optional
The default DIS priority is 64.
Table 256 Configure router type
Operation Command Description
Enter system view system-view -
Enter IS-IS view isis [ tag ] Required
Configure router type is-level { level-1 | level-1-2 |
level-2 }
Optional
By default, the router type is
level-1-2.
Table 257 Configure the interface line type
Operation Command Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
Configure the line type of an
interface
isis circuit-level [ level-1 | level-1-2 |
level-2 ]
Optional
The default line
type is level-1-2.