Filtering Routes Advertised By Ospf - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l Based on the IP prefix: filter-policy acl-name acl-name export [ protocol [ process-id ] |
The filter-policy is configured in the RIP process. If routes are filtered based on an interface,
you can configure only one route-policy based on the interface at a time. If no interface is
specified, the system considers the configured route-policy as the global route-policy, and you
can configure only one route-policy at a time. If the route-policy is configured repeatedly, the
new route-policy will replace the old route-policy.
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10.5.3 Filtering Routes Advertised by OSPF

By applying filters, you can control the advertisement of OSPF routes.
Context
Perform the following steps on the router that runs OSPF:
Procedure
Step 1 Run:
system-view
Issue 02 (2014-09-30)
3. Run acl name acl-name advance [ number acl-number2 ] [ match-order { auto |
config } ], the basic ACL view is displayed.
4. Run rule [ rule-id ] { deny | permit } protocol [ source { source-ip-address source-
wildcard | any } | time-range time-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.
– If the action specified in an ACL rule is deny, a route that matches the rule will not
be received or advertised by the system.
– If a route has not matched any ACL rules, the route will not be received or advertised
by the system.
– If an ACL does not contain any rules, all routes matching the route-policy that
references the ACL will not be received or advertised by the system.
– If the ACL referenced by the route-policy does not exist, all routes matching the
route-policy will be received or advertised by the system.
– In the configuration order, the system first matches a route with a rule that has a
smaller number and then matches the route with a rule with a larger number. Routes
can be filtered using a blacklist or a whitelist:
Route filtering using a blacklist: Configure a rule with a smaller number and specify
the action deny in this rule to filter out the unwanted routes. Then, configure another
rule with a larger number in the same ACL and specify the action permit in this rule
to receive or advertise the other routes.
Route filtering using a whitelist: Configure a rule with a smaller number and specify
the action permit in this rule to permit the routes to be received or advertised by the
system. Then, configure another rule with a larger number in the same ACL and
specify the action deny in this rule to filter out unwanted routes.
interface-type interface-number ]
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10 Routing Policy Configuration
*
, a rule is configured for the basic ACL.
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