Filtering Ipv4 Is-Is Routes - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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7.4.4 Filtering IPv4 IS-IS Routes

If some IS-IS routes are not preferred, configure conditions to filter IS-IS routes. Only IS-IS
routes meeting the specified conditions can be added to an IP routing table.
Context
Only routes in an IP routing table can be used to forward IP packets. An IS-IS route can take
effect only after this IS-IS route has been successfully added to an IP routing table.
If an IS-IS route does not need to be added to a routing table, specify conditions, such as a basic
ACL, IP prefix, and routing policy, to filter routes so that only IS-IS routes that meet the specified
conditions can add to an IP routing table. IS-IS routes that do not meet the specified conditions
cannot be added to the IP routing table and cannot be selected to forward IP packets.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
isis [ process-id ]
The IS-IS view is displayed.
Step 3 Run any of the following commands as required:
l Based on the basic ACL:
Issue 02 (2014-09-30)
3. Run:
nexthop ip-address weight value
A preference value is configured for an equal-cost IS-IS route.
NOTE
A larger value of the value parameter indicates a higher preference. The default value of the
preference is 255.
1. Run filter-policy { acl-number | acl-name acl-name } import, conditions for filtering
IS-IS routes are configured.
2. Run quit, return to the system view.
3. Run acl { [ number ] acl-number1 | name acl-name basic [ number acl-number2 ] }
[ match-order { auto | config } ], the basic ACL view is displayed.
4. Run rule [ rule-id ] { deny | permit } [ fragment-type fragment-type-name | source
{ source-ip-address source-wildcard | any } | time-range time-name | vpn-instance
vpn-instance-name ]
When a filtering policy of a routing protocol is used to filter routes:
– If the action specified in an ACL rule is permit, a route that matches the rule will
be received or advertised by the system.
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*
, a rule is configured for the basic ACL.
7 IS-IS Configuration
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