Subject: [PWE3] Questions about R bit setting and handling.

From: Andrew Yu <[email-masked]>
Date: Tue, 13 Mar 2007 13:58:53 +0800

Hi ,  Sasha
I come from Huawei Tech PWE3 research department. Currently, I have some doubt in the R bit setting and handling for SAToP and  CESoPSN. 

Does the R bit may be used for protection switching?  And how to evaluate the packet loss rate?
Because in CESoPSN draft the R bit will be set if PSN-bound IWF's local CE-bound IWF is in the packet loss state. 
Of course, it points out that it has lost a preconfigured number of consecutive packets. 

Example1 :  the Ingress PE sends PDU 1,2,3,4,5,6,7... the egress PE only receives 1,2,7... and preconfigured number of consecutive packets is 4, so PSN-bound IWF should set R bit. 
Example2: the Ingress PE sends PDU 1,2,3,4,5,6,7,8... the egress PE only receives 1,3,5,7....In this case the lost packets are not consecutive, but it stands for that the link is not good and 
                 available for using. How to handling it? Some persons suggest to calculate the packet loss rate? Does it meaningful for TDM PWE3? Do you have some suggestion to evaluate the 
                 packet loss rate? 

Last, can you introduce some concept about using R bit for protection switching?

Cheers
  Andrew S. Yu
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