Huawei Quidway NetEngine80E Configuration Manual page 808

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Issue 02 (2014-09-30)
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.
– To filter routes based on an advanced ACL, perform the following steps:
a. Run filter-policy acl-name acl-name export [ protocol [ process-id ] ], the
advertised routes is filtered based on an ACL.
b. Run quit, return to the BGP view.
c. Run quit, return to the system view.
d. Run acl name acl-name advance [ number acl-number2 ] [ match-order
{ auto | config } ], the basic ACL view is displayed.
e. Run rule [ rule-id ] { deny | permit } protocol [ source { source-ip-address
source-wildcard | any } | time-range time-name ]
the basic ACL.
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.
– To filter routes based on an IP prefix list, run the filter-policy ip-prefix ip-prefix-
name export [ protocol [ process-id ] ] command.
If protocol is specified, only routes discovered by a specific routing protocol are
filtered. If protocol is not specified, all the routes to be advertised are filtered, including
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8 BGP Configuration
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, a rule is configured for
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