Configuring Is-Is Route Filtering - HP 3600 v2 series Configuration Manual

To do...
Redistribute routes from
another routing protocol
Configure the maximum
number of redistributed
Level 1/Level 2 IPv4
routes
NOTE:
Only active routes can be redistributed. 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 referencing a configured ACL, IP prefix list, or routing policy, you can filter the calculated routes. 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
Filter routes calculated from
received LSPs
Filtering redistributed routes
IS-IS can redistribute routes from other routing protocols (or other IS-IS processes), add them into the IS-IS
routing table, and advertise them in LSPs.
By reference a configured ACL, IP prefix list, or routing policy, you can filter redistributed routes and only
the routes matching the filter can be added into the IS-IS routing table and advertised to neighbors.
Follow these steps to configure the filtering of redistributed routes:
To do...
Enter system view
Use the command...
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 ]
filter-policy { acl-number | ip-prefix
ip-prefix-name | route-policy route-policy-name }
import
Use the command...
system-view
150
Remarks
Required
No route is redistributed by
default.
If no level is specified, routes are
redistributed into the Level-2
routing table by default.
Optional
The default varies with devices.
Remarks
—
—
Required
No filtering is configured by
default.
Remarks
—