Configuring Is-Is Route Filtering - 3Com S7906E Configuration Manual

Only active routes can be redistributed. You can use the display ip routing-table protocol
command to display route state information.
For how to configure the working mode, refer to the switch-mode configuration in Device
Management Configuration in the System Volume.

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
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
Enter IS-IS view
Configure the filtering of routes
redistributed from another
routing protocol or IS-IS
process
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
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
filter-policy { acl-number | ip-prefix
ip-prefix-name | route-policy
route-policy-name } export [ protocol
[ process-id ] ]
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Remarks
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Required
No filtering is configured
by default.
Remarks
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Required
Not configured by
default