3Com 8807 Configuration Manual page 348

348 C 32: I
HAPTER NTEGRATED
Configuring IS-IS
Routing Leak
Setting IS-IS Route
Summary
Setting to Generate
Default Route
IS-IS C
ONFIGURATION
The filter-policy export command only takes effect to the routes imported by
■
the import-route command. If you configure the switch with only the
filter-policy export command, but without configuring the import-route
command to import other external routes, then the filter-policy export
command does not take effect.
If the filter-policy export command does not specify which route to be
■
filtered, then the all the routes imported by the import-route command will
be filtered.
By virtual of IS-IS routing leak function, a Level-1-2 router can advertise the routing
information of a Level-2 area it knows to a Level-1 router.
Perform the following configuration in IS-IS view.
Table 317 Configure IS-IS routing leak
Operation
Enable IS-IS routing leak
Disable IS-IS routing leak
By default, a Level-2 router does not advertise its routing information to a Level-1
area.
Users can set the routes with the same next hops as one route in the routing table.
Perform the following configurations in IS-IS view.
Table 318 Set a summary route
Operation
Set a summary route
Delete the summary route
By default, the system disables route summary.
In the IS-IS route domain, the Level-1 router only has the LSDB of the local area, so
it can only generate the routes in the local areas. But the Level-2 router has the
backbone LSDB in the IS-IS route domains and generates the backbone network
routes only. If a Level-1 router in one area wants to forward the packets to other
areas, it needs to first forward the packets to the closest Level-1-2 router in the
local area along its default route. You do not need to configure the default Level-1
route, but need to manually configure the default Level-2 route.
Perform the following configurations in IS-IS view.
Table 319 Set to generate default route
Operation
Set to generate default route
Set not to generate default
route
Command
import-route isis level-2 into level-1 [ acl acl-number ]
undo import-route isis level-2 into level-1 [ acl acl-number ]
Command
summary ip-address ip-mask [ level-1 | level-1-2 | level-2 ]
undo summary ip-address ip-mask [ level-1 | level-1-2 |
level-2 ]
Command
default-route-advertise [ route-policy route-policy-name ]
undo default-route-advertise [ route-policy
route-policy-name ]