The MPLS WG Archive

[liushuying <lshuying@huawei.com>]

Hi folks,
    I support this draft becoming a WG document.

    However,i am about to ask a  question.

   1) 2.3.2.4.  Upstream LSR change

   If, for a given node Z participating in a P2MP LSP <X, Y>, the
   upstream LSR changes, say from U to U', then Z MUST update its
   forwarding state by deleting the state for label L, allocating a new
   label, L', for <X,Y>, and installing the forwarding state for L'.  In
   addition Z MUST send a Label Map <X, Y, L'> to U' and send a Label
   Withdraw <X, Y, L> to U.

  The question:
  When a large quantity of P2MP LSPs exists in MPLS networks, 
  if unicast routing information changes, there may be many LSRs 
  whose upstream LSRs have changed in every P2MP LSP, each of them sends a Label Withdraw message 
  to its old upstream LSR and a Label Map message to its new upstream LSR  at the same time, 
  so the load of every LSR will enhance sharply and last for a long time. 
  As a result, the time of traffic disruption in every P2MP LSP will last for a long time, 
  and so many packets will be lost.  
    
  Thanks 
  Shuying Liu         


----- Original Message ----- 
> Date: Mon, 06 Feb 2006 07:50:51 -0500
> From: George Swallow <swallow@cisco.com>
> Subject: [mpls] LDP Multicast to WG Document
> To: mpls@ietf.org
> Message-ID: <20060206125051.3E3BD17B472@SwallowPB.local>
> 
> It has been requested that 
> 
> Label Distribution Protocol Extensions for Point-to-Multipoint and
>             Multipoint-to-Multipoint Label Switched Paths
>                 draft-minei-wijnands-mpls-ldp-p2mp-00
> 
> become a MPLS WG document.
> 
> Please indicate your support or objections by the end of this week.
> 
> Thanks,
> 
> ...George
> 
> ========================================================================
> George Swallow             Cisco Systems                  (978) 936-1398
>                           1414 Massachusetts Avenue
>                           Boxborough, MA 01719
> 
> 
> 
> 
> 
> ------------------------------
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