3com 3031 Instruccion De Instalación
530
C
HAPTER
41: I
NTEGRATED
IS-IS C
ONFIGURATION
Specifying the Ratio of Dead Timer-to-Hello Timer
IS-IS maintains adjacencies by the transmission and reception of Hello packets. If
the router fails to receive a Hello packet from a peer before the configured dead
timer expires, the peer is considered invalid.
the router fails to receive a Hello packet from a peer before the configured dead
timer expires, the peer is considered invalid.
By default, the number of Hello messages is 3.
If neither
Level-1
nor
Level-2
is configured in the command, the configuration
takes effect on Hello messages of both Level-1 and Level-2.
Configuring the Priority
of a Router
IS-IS elects a Designated Intermediate System (DIS) router on broadcast networks.
On broadcast networks, a DIS must be selected. The Administrator can modify the
priority of the router in an effort to determine which router will become the DIS.
The higher the priority, the more likely the router will assume the DIS function. In
the event all routers on a broadcast network share the same priority level, the
router with the higher MAC address will be the elected DIS. When setting the
priority of the router, select the correct level (either Level-1 or Level-2) depending
on the interface type connected to the broadcast domain.
priority of the router in an effort to determine which router will become the DIS.
The higher the priority, the more likely the router will assume the DIS function. In
the event all routers on a broadcast network share the same priority level, the
router with the higher MAC address will be the elected DIS. When setting the
priority of the router, select the correct level (either Level-1 or Level-2) depending
on the interface type connected to the broadcast domain.
The DIS of Level-1 and Level-2 are elected separately. You can set different
priorities for DIS election at different levels.
priorities for DIS election at different levels.
Perform the following in the Interface View.
By default, the priority on an interface is 64. If the level is not specified, the priority
of Level-1 is set by default.
of Level-1 is set by default.
Configuring Interface
Circuit Level
Perform the following in the Interface View.
Table 602 Specifying the ratio of Dead Timer to Hello Timerl
Operation
Command
Specify the ratio of Dead Timer
to Hello Timer
to Hello Timer
isis timer dead value [ level-1 | level-2 ]
Restore the default setting
undo isis timer dead [ level-1 | level-2 ]
Table 603 Setting the priority for DIS election
Operation
Command
Set the priorities for DIS
election on the interface
election on the interface
isis dis-priority value [ level-1 | level-2 ]
Restore the default
priorities for DIS election on
the interface
priorities for DIS election on
the interface
undo isis dis-priority [ level-1 | level-2 ]
Table 604 Setting interface circuit level
Operation
Command
Set interface circuit level
isis circuit-level [ level-1 |
level-1-2 | level-2 ]
level-1-2 | level-2 ]
Restore the default interface circuit level
undo isis circuit-level