–
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.
–
Configure an advanced ACL:
a.
Run
acl ipv6
name
acl-name
[
number
acl-number2
] [
match-order
{
auto
|
config
} ]
The basic ACL view is displayed.
b.
Run
rule
[
rule-id
] {
deny
|
permit
}
protocol
[
source
{
source-
ipv6-address
prefix-length
|
source-ipv6-address
/
prefix-length
|
any
} |
time-range
time-name
]
*
A rule is configured for the advanced 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
HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
7 IS-IS Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
588
