No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
BGP ORF

BGP ORF

The prefix-based BGP outbound route filtering (ORF) capability to advertise required BGP routes. BGP ORF allows a device to send prefix-based import policies in a Route-refresh message to BGP peers. BGP peers construct export policies based on these import policies to filter routes before sending these routes, which has the following advantages:
  • Prevents the local device from receiving a large number of unnecessary routes.
  • Reduces CPU usage of the local device.
  • Simplifies the configuration of BGP peers.
  • Improves link bandwidth efficiency.

Applications

BGP ORF applies to the scenario when a device wants BGP peers to send only required routes, and BGP peers do not want to maintain different export policies for different devices.

Figure 9-11 Inter-AS EBGP peers

As shown in Figure 9-11, after negotiating the prefix-based ORF capability with RouterB, RouterA adds the local prefix-based import policies to a Route-refresh message and sends the message to RouterB. RouterB constructs export policies based on the received Route-refresh message and sends required routes to RouterA using a Route-refresh message. RouterA receives only required routes, and RouterB does not need to maintain routing policies. This reduces the configuration workload.

Figure 9-12 Intra-AS route reflector

As shown in Figure 9-12, there is a route reflector (RR) in AS 100. RouterA and RouterB are the clients of the RR. RouterA, RouterB, and the RR negotiate the prefix-based ORF capability. RouterA and RouterB then add the local prefix-based import policies to Route-refresh messages and send the messages to the RR. The RR constructs export policies based on the received import policies and reflects required routes in Route-refresh messages to RouterA and RouterB. RouterA and RouterB receive only required routes, and the RR does not need to maintain routing policies. This reduces the configuration workload.

Translation
Download
Updated: 2019-05-17

Document ID: EDOC1000174069

Views: 141483

Downloads: 280

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next