H3C Technologies H3C S12500-X Series Switches - Manual (Page 151)

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Filtering redistributed routes
IS-IS can redistribute routes from other routing protocols or other IS-IS processes, add them to the IS-IS
routing table, and advertise them in LSPs.
Perform this task to filter redistributed routes. Only routes that are not filtered can be added to the IS-IS
routing table and advertised to neighbors.
To filter redistributed routes:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Filter routes redistributed from
other routing protocols or IS-IS
processes.
filter-policy { acl-number | prefix-list
prefix-list-name | route-policy
route-policy-name } export [ protocol
[ process-id ] ]
By default, IS-IS route
filtering is not configured.
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Configuring IS-IS route leaking
Perform this task to control route advertisement (route leaking) between Level-1 and Level-2.
You can configure IS-IS to advertise routes from Level-2 to Level-1, and to not advertise routes from Level-1
to Level-2.
To configure IS-IS route leaking:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Configure route
leaking from Level-1 to
Level-2.
import-route isis level-1 into level-2 [ filter-policy
{ acl-number | prefix-list prefix-list-name |
route-policy route-policy-name } | tag tag ] * By default, IS-IS advertises
routes from Level-1 to
Level-2.
4. Configure route
leaking from Level-2 to
Level-1.
import-route isis level-2 into level-1 [ filter-policy
{ acl-number | prefix-list prefix-list-name |
route-policy route-policy-name } | tag tag ] *
By default, IS-IS does not
advertise routes from
Level-2 to Level-1.
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Tuning and optimizing IS-IS networks
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Configuration prerequisites
Before you tune and optimize IS-IS networks, complete the following tasks:
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
• Enable IS-IS.