NOTE
The relationship between the
if-match
clauses in a node of a route-policy is "AND". A route
must match all the rules before the action defined by the
apply
clause is taken. For example,
if two
if-match
clauses (
if-match acl 2003
and
if-match as-path-filter 100
) are defined in the
route-policy
route-policy-example permit node 10
command, a route is considered to match
node 10 only when it matches the two
if-match
clauses.
4.
(Optional) Perform the following operations as needed to configure
apply
clauses for
current nodes of the route-policy:
apply
clauses can be used to set attributes for routes matching
if-match
clauses. If
this step is not performed, the attributes of routes matching
if-match
clauses keep
unchanged.
–
To replace or add a specified AS number in the AS_Path attribute of a BGP route,
run the
apply as-path
as-number
command.
–
To delete a specified BGP community attribute from a route, run the
apply comm-
filter
comm-filter-number
delete
command.
TIP
The
apply comm-filter delete
command deletes a specified community attribute from a
route. An instance of the
ip community-filter
command can specify only one community
attribute each time. To delete more than one community attribute, run the
ip community-
filter
command multiple times. If multiple community attributes are specified in one
community filter, none of them can be deleted. For more information, see the
S6700
Series Ethernet Switches Command Reference
.
–
To delete all community attributes from a BGP route, run the
apply community
none
command.
–
To set community attributes for a BGP route, run the
apply community
{ {
community-number
|
aa:nn
} &<1-32> |
internet
|
no-advertise
|
no-export
|
no-export-subconfed
}
*
[
additive
] command.
–
To set an extended community attribute (route-target) for a route, run the
apply
extcommunity
{
rt
{
as-number:nn
|
4as-number:nn
|
ipv4-address:nn
} }
&<1-16> [
additive
] command.
–
To set the local preference for a BGP route, run the
apply local-preference
preference
command.
–
To set the Origin attribute for a BGP route, run the
apply origin
{
igp
|
egp
as-
number
|
incomplete
} command.
–
To set a preferred value for a BGP route, run the
apply preferred-value
preferred-
value
command.
–
To set dampening parameters for an EBGP route, run the
apply dampening
half-
life-reach
reuse
suppress
ceiling
command.
The operations in Step 4 can be performed in any order. A node may have multiple
apply
clauses or no
apply
clause.
----End
7.5.3 Configuring to Controll the Advertisement of BGP Routing
Information
After a route advertisement policy is configured on a device, the device advertises only routes
matching the policy to its peers.
S6700 Series Ethernet Switches
Configuration Guide - IP Routing
7 BGP Configuration
Issue 01 (2012-03-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
390
