Huawei Quidway NetEngine80E Configuration Manual page 810

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Issue 02 (2014-09-30)
– 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 advanced ACL, perform the following steps:
a. Run peer { ipv4-address | group-name } filter-policy acl-name acl-name
export, 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
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8 BGP Configuration
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, a rule is configured for
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