H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches Chapter 5 IS-IS Configuration
5-13
5.3.10 Configuring Route Summarization
You can configure the routes having the same IP prefix as one summarized route.
Follow these steps to configure route summarization:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter IS-IS view isis [ tag ] —
Configure route
summarization
summary ip-address
ip-mask [ level-1 |
level-1-2 | level-2 ]
Required
By default, the system
performs no route
summarization.
5.3.11 Configuring Default Route Generation
In an IS-IS routing domain, a Level-1 router maintains the LSDB for the local area only
and generates the routes within the local area only. A Level-2 router maintains the
LSDB for the backbone within the IS-IS routing domain and generates the routes for
the backbone only. To transfer packets to another area, a Level-1 router in an area
needs to first transfer the packets to the nearest Level-1-2 router within the local area.
This requires the default route at Level-1.
Follow these steps to configure default route generation:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter IS-IS view isis [ tag ] —
Configure default route
generation
default-route-advertise
[ route-policy
route-policy-name ]
Required
The default route is
advertised to only the
routers at the same level.
5.3.12 Configuring Protocol Priority
For a router running multiple routing protocols, routing information needs to be shared
and selected by the routing protocols. The system assigns a priority for each routing
protocol. When multiple routing protocols discover a route to the same destination,
the protocol with the highest priority will dominate.
Follow these steps to configure protocol priority: