Filtering Routes Received By Bgp - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l Based on the named advanced ACL:
l Based on the IP prefix: filter-policy ip-prefix ip-prefix-name import
l Based on the Route-Policy: filter-policy route-policy route-policy-name import
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10.4.5 Filtering Routes Received by BGP

By applying filters, you can control the receiving of BGP routes.
Procedure
l
Issue 02 (2014-09-30)
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.
1. Run filter-policy acl-name acl-name import, you can configure IS-IS to filter the
received routes to be added to the IP routing table.
2. Run quit, return to the system view.
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.
Filtering the Received Routes
Perform the following steps on the router that runs BGP:
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10 Routing Policy Configuration
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, a rule is configured for the basic ACL.
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