Subject: [Idr] New method for format of ExtCommunity then ExtCommunity can carry TOS of IP header and keep the ability for classifing route information

From: zhangzhifeng <[email-masked]>
Date: Thu, 03 Nov 2005 10:53:47 +0800

Since BGP commuity can only classify routing information,if you want to apply QoS policy based on BGP ,you can use BGP 

community to classify route information, then apply the TOS or some other QoS policy based on the classified route
information.

   For example:
  
   On the large network, to make classifing simple, usually, we can apply the QoS policy based on BGP. 
   
   The process is as following: 
   1. Before the BGP route information is advertised, we classify it by BGP community.  
   2. The accepter of BGP route information will match the classify route information then apply the policy.

   The process is complex.   
  
   To make the process simple, we can use the ExtCommunity to support
   QoS task. 
   
   If BGP Extended Community can map TOS value of IP header at the same time and keep the ability for classifing route 

information,the QoS policy based on BGP will be simple.
   
   For example:
   In the same AS, to make classifing simple.

   The process is as following:
   1. Before the BGP route information is advertised, we map the TOS value into ExtCommunity, and at the same time classify 

route information by ExtCommunity. The actions of classifying route information is optional, it is just for classifying route 

information.
  
   2. The accepter of BGP route information can directly apply the TOS policy which is carried by ExtCommunity.

   The process is simple.
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