reflect change path attribute for route policy

Hi,

I'm not sure what reflect change path attribute is :), but I know it's possible to change the AS_PATH attribute advertised to an iBGP peer. For instance, you can define a route-policy as below, were we can apply/add additional AS no into the AS_PATH as below. This is useful for AS prepending scenario.

#
route-policy rp1 permit node 10
if-match acl 2008
apply as-path 65530 65530 65530 additive
#

then apply for an internal BGP peer like below:

peer 10.172.183.1 route-policy rp1 export

Then the peer should receive the prefix matching the ACL with AS_PATH BGP attribute changed accordingly with route-policy apply setting.

*> 10.15.188.0/24 10.172.183.2 0 65510 i
* 10.160.29.0/24 10.172.183.2 0 0 65510 65510 65510 65510 i \\\ this prefix will have a worsen metric

For more details, please check this forum thread.

http://forum.huawei.com/enterprise/en/forum.php?mod=viewthread&tid=191037&page=1#pid1082865

I hope this is what you are trying to achieve :).

hi,

thanks for your information......but in route policy I m using below.

route-policy IPV4-TO-PRE-AGG permit node 10
if-match mpls-label
apply ip-address next-hop peer-address
apply mpls-label

peer PRE-AGG route-policy IPV4-TO-PRE-AGG export

so in above command ..........route policy is not taking effect....sp pls in this scenario

Please add one more node to the route-policy

route-policy IPV4-TO-PRE-AGG permit node 10
if-match mpls-label
apply ip-address next-hop peer-address
apply mpls-label
route-policy IPV4-TO-PRE-AGG permit node 20

Then check on the other peer whether the bgp prefixes are shown in the bgp routing table. it may not appear in public routing table because it might not be considered the best.

Hi, shehbaz!

     
You can use local-preference of bgp path attribute between ibgp peer and ibgp peer.

The example is as per below:

1. Define the ACL to permit routing that you want to pass to the ibgp peer.

#

acl number 2004

description default-internet

rule 1 permit source 0.0.0.0 0

#

2. Define Route-policy.

#

route-policy test deny node 10

 if-match acl 2004

 

apply local-preference 200

3. Please use route-policy to ibgp peer.

#

ipv4-family unicast

peer 10.10.64.2 as-number 100 route-policy test

#

This is the viewpiont of the configuration. Happy for your acceptance!