H3C Technologies H3C S7500E Series Switches - Manual (Page 169)

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Configuring IS-IS Route Redistribution
Redistribution of large numbers of routes on a device may affect the performance of other devices in
the network. In that case, you can configure a limit on the number of redistributed routes to limit the
number of routes to be advertised.
Follow these steps to configure IS-IS route redistribution from other routing protocols:
To do… Use the command… Remarks
Enter system view system-view ––
Enter IS-IS view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
––
Redistribute routes from
another routing protocol
import-route protocol [ process-id |
all-processes | allow-ibgp ] [ cost cost |
cost-type { external | internal } | [ level-1 |
level-1-2 | level-2 ] | route-policy
route-policy-name | tag tag ] *
Required
No route is redistributed by default.
If no level is specified, routes are
redistributed into the Level-2
routing table by default.
Configure the maximum
number of redistributed
Level 1/Level 2 IPv4
routes
import-route limit number
Optional
The default value depends on the
SRPU models, LPU models, and
their working modes.
z Only active routes can be redistributed. You can use the display ip routing-table protocol
command to display route state information.
z For how to configure the working mode, see the switch-mode configuration in Device
Management Configuration in the Fundamentals Configuration Guide.
Configuring IS-IS Route Filtering
You can reference a configured ACL, IP prefix list or routing policy to filter routes calculated from the
received LSPs and the routes redistributed from other routing protocols.
Filtering routes calculated from received LSPs
IS-IS saves the LSPs received from neighbors in the LSDB, uses the SPF algorithm to calculate the
shortest path tree with itself as the root and installs the routes into the IS-IS routing table.
By reference a configured ACL, IP prefix list or routing policy, you can filter the calculated routes and
only the routes matching the filter can be added into the IS-IS routing table.
Follow these steps to filter routes calculated from received LSPs: