The MPLS WG Archive

[Ajay Simha <asimha@cisco.com>]

On Tue, 25 Sep 2001, Mareline Sheldon wrote:

> I have a doubt which is bugging me.
> Which procedure/protocol is used for creating binding between labels and
> FECs i.e who decides that all my traffic to 192.168/16 with certain QoS
> parameters should be assigned label "x". I know what happens after the
> labels are assigned to FECs. LDP is used to distribute this label binding
> information. But the question is that who does the initial part and what are
> the considerations.


I have not actually looked at any working code but if I were to guess the
following has to happen:

1. A callback needs to exist that invokes a process that creates LIB table and
   assigns local labels (at least in DU) to all IGP and statically derived
   prefixes.  This does not have to be a protocol since there is no
   interaction between LSRs to achieve this.  It can be a procedure that
   follows definitions from RFC 3031 and RFC 3032.  This callback has to be
   invoked only after your routing processes have been established.

2. LDP will need to have a two way interaction with this procedure to send
  label bindings to the neighbors and populate the LIB upon receiving
  bindings.

-ajay
 > Regards,
> Mary
>
>
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-- 
Ajay Simha
MPLS Deployment Engineer
IOS Technology Division
(919) 392-3141

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