The MPLS-OPS Archive

[Ian <ipotts@msbx.net>]

Hello Ravindra,

Thank you for your reply.  My understanding is that a Non-ATM LSR uses
independent LSP control, not ordered.  This is where my question comes from.

If Non-ATM LSRs can use independent LSP control, why can't ATM LSRs do the
same?


Thank you,
Ian



Quoting Ravindra Botkar <ravibotkar@yahoo.com>:

> Hello Ian, 
> 
> Maybe this could help you to understand :-
> 
> Non-ATM LSR --> Frame Mode MPLS 
> 1) Downstream Unsolicited Label Distribution (as they
> are  not subject to Cell interleaving problem ) 
> 2) Ordered LSP Control (Prevents  data   forwarding
> across partially established paths) 
> 3) Liberal Retention Mode (faster adaptation to state
> and routing changes in the network)
> 
> ATM-LSR --> Cell Mode MPLS (MPLS enabled ATM) 
> 1) Downstream-On-Demand Label Distrbution (Avoids Cell
> Interleaving Problem but eats up the VCI resources) 
> 2) Ordered LSP Control (Prevents  data   forwarding
> across partially established paths)  
> 3) Conservative Retention Mode (minimize no of labels
> VPI/VCI thereby optimizing resources of each ATM LSR )
> 
> Regards,
> Ravi
> 
> --- Ian <ipotts@msbx.net> wrote:
> 
> > Hello Ravindra,
> > 
> > Thank you for your reply.  Couldn't the same be
> > argued for frame LSRs?  Couldn'
> > t independent label distribution also lead to
> > partially established tunnels for
> > a period of time leading to drops?  
> > 
> > Many Thanks,
> > Ian
> > 
> > 
> > 
> > Quoting Ravindra Botkar <ravibotkar@yahoo.com>:
> > 
> > > 
> > > Independent label distribution could lead to data
> > > forwarding across partially established paths,
> > thus
> > > creating black holes....
> > > 
> > > Regds,
> > > Ravindra 
> > > 
> > > --- Ian <ipotts@msbx.net> wrote:
> > > 
> > > > Hello,
> > > > 
> > > > Would you please tell me why ATM switches do
> > ordered
> > > > label not independent label
> > > > distribution.  In other words when the ATM
> > switch
> > > > gets a label request, why
> > > > doesn't it immediately allocate a label and send
> > it
> > > > upstream, why does it need
> > > > to forward a label request downstream and not
> > reply
> > > > upstream until it gets a
> > > > response?
> > > > 
> > > > I have heard that it is something to do with the
> > ATM
> > > > switch not being able to do
> > > > a layer 3 lookup?
> > > > 
> > > > Thanks in advance.
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
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