Re: How are SONET/SDH labels (SUKLM fields) calculated.

[Dimitri.Papadimitriou@alcatel.be]

hi,

> I would like to know that given a SONET/SDH traffic params, how would
> downstream LSR
> calculate label values (SUKLM values).

label "values" are pre-determined by the sonet/sdh multiplexing 
structure (pointing you to G.707/T1.105 here), downstream lsr 
label allocation depends on the request type

> I have gone through RFC draft-ietf-ccamp-gmpls-sonet-sdh-07.txt, but
> couldn't
> corelate the values of SUKLM fields to the traffic params.

i give you here an example in order to help when setting up 
a VC-4 over an STM-4 (like a zoom here between two nodes):

an lsr desires to setup a single VC-4 lsp, the traffic parameters
takes the following values: RCC = 0, NCC = 0, NVC = 0, MT = 1 and 
T = 0 which applies to a VC-4 elementary signal (signal type = 6), 
and for instance the label that this node will receive back takes 
the following value S=2,U=0,K=0,L=0,M=0 meaning that the second 
AUG-1 has been selected in the STM-4 multiplex structure 

> Am I missing something, or need to read some more info on SONET/SDH as I am
> new on
> this topic. In that case any pointers would definitely help.

there is a framework on the subject that may help you but you 
can also take a look at the gmpls architecture that introduces 
the protocol context (pointers available on the ccamp wg webpage)

hope this will help,
- dimitri.

> Any help would be highly appreciated.
> 
> TIA.
> 
> Best Regards,
> RA Merchant.
> 
> _________________________________________________________________
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