The MPLS WG Archive

[Emily <chenying220@huawei.com>]

 As the figure below, MPLS traffic is forwarded from RTA to RTF. In this case, LDP-IGP synchronazation should be used on RTB. Once the optimal path changes, it is necessary for RTB to affirm the switching time accurately. Otherwise, the important packets (such as VPN traffic) would be discarded or forwarded through a non-optimal path in long time. 

 

 

                                       (Optimal Path)             
                                           +---+                                              
                      +--------------------|RTC|----------------------+                       
                      |                    +---+                      |                       
                      |                                               |                       
+---+               +---+                                           +---+               +---+ 
|RTA|---------------|RTB|                                           |RTE|---------------|RTF| 
+---+               +---+                                           +---+               +---+ 
                      |                                               |                       
                      |                    +---+                      |                       
                      +--------------------|RTD|----------------------+                       
                                           +---+                                              

----- Original Message -----

From: Leon

To: Emily

Cc: mpls@lists.ietf.org

Sent: Tuesday, June 26, 2007 10:11 AM

Subject: Re: [mpls] Comments please: I-DACTION:draft-chen-mpls-ldpigp-syn-accurate-00.txt

Could you give the more information about detail scenarios to clarify the requirements for the explicit notification of ldp-idp synchronization.

 

Thanks

Leon

----- Original Message -----

From: Emily

To: mpls@lists.ietf.org

Sent: Monday, June 25, 2007 1:17 PM

Subject: [mpls] Comments please: I-DACTION:draft-chen-mpls-ldpigp-syn-accurate-00.txt

Hi,

 

I am writing to ask advices for the newly issued internet-draft "Explicit Notification for LDP-IGP Synchronization".

 

This document proposes a mechanism to affirm the switching time accurately by propagating a explicit notification from downstream. The proposed solution can be used in a MPLS L2VPN or L3VPN scenario, to prevent any traffic from being discarded, and avoid the important traffic from being forwarded through a non-optimal path in long time even if the optimal path is operational.

 

Any suggestion or opinion of the mechanism will be appreciated. Looking forward to your reply!

 

Details of the document is as follows:

 

> Title : Explicit Notification for LDP-IGP Synchronization
> Author(s) : E. Chen
> Filename : draft-chen-mpls-ldpigp-syn-accurate-00.txt
> Pages : 10
> Date : 2007-6-18
>
>  A fundamental concept in Label Distribution Protocol - Interior
>  Gateway Protocol (LDP-IGP) Synchronization is that LDP is fully
>  established before the IGP path is switched for IP forwarding. This
>  document proposes a mechanism to affirm the switching time accurately
>  by propagating a explicit notification from downstream. The
>  interoperability with other Label Switched Routers (LSRs), which may
>  not support the mechanism, is also considered.
>
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-chen-mpls-ldpigp-syn-accurate-00.txt

 

 

 

Best Regards,

Emily Chen ¡¡¡¡¡¡¡¡¡¡
2007-06-25

---

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