3Com Switch 8800 Family Configuration Guide

348 CHAPTER 32: INTEGRATED IS-IS CONFIGURATION
■ 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.
Configuring IS-IS
Routing Leak
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.
By default, a Level-2 router does not advertise its routing information to a Level-1
area.
Setting IS-IS Route
Summary
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.
By default, the system disables route summary.
Setting to Generate
Default Route
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.
Tabl e 317 Configure IS-IS routing leak
Operation Command
Enable IS-IS routing leak import-route isis level-2 into level-1 [ acl acl-number ]
Disable IS-IS routing leak undo import-route isis level-2 into level-1 [ acl acl-number ]
Tabl e 318 Set a summary route
Operation Command
Set a summary route summary ip-address ip-mask [ level-1 | level-1-2 | level-2 ]
Delete the summary route
undo summary ip-address ip-mask [ level-1 | level-1-2 |
level-2 ]
Tabl e 319 Set to generate default route
Operation Command
Set to generate default route default-route-advertise [ route-policy route-policy-name ]
Set not to generate default
route
undo default-route-advertise [ route-policy
route-policy-name ]