HP 4800G Series Configuration Manual page 528

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...
Enter system view
Enter IS-IS view
Redistribute routes
from another routing
protocol
Configure the
maximum number of
redistributed Level
1/Level 2 IPv4 routes
Only active routes can be redistributed. You can use the display ip routing-table protocol command
to display route state information.
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:
To do...
Enter system view
Enter IS-IS view
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
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 ] *
import-route limit number
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
1-21
Remarks
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Required
No route is redistributed by
default.
If no level is specified, routes
are redistributed into the
Level-2 routing table by default.
Optional
By default the maximum
number of redistributed Level
1/Level 2 IPv4 routes is 12288
Remarks
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