RE: SDH/SONET in GMPLS

["manoj juneja" <manojkumarjuneja@hotmail.com>]

Hi James,

    My question was little bit different. Let me re-pharse the question.
In SONET, each VTG of STS-1 can have VTs of different size (i.e 1 VTG
can contain 1  VT-6, other VTG within the same STS-1 can contain 2 VT-3
etc). As VTG in SONET is equivalent to TUG-2 in SDH. Does this mean
that each TUG-2 within STM-1 can contain different type of VC-X (X=2,
12, 11) i.e. one TUG-2 can contain 3 VC-12 and other TUG-2 within same
STM-1 can contain 1 VC-2 ?

Furthermore, As per draft-mannie-mpls-sdh-ospf-isis-01.txt, It is
assumed that every STM-1/STS-1 of STM-N/STS-M, M, N > 1 will have the
same multiplexing capability. This type of restriction is not as per
SDH/SONEYT. Does this mean this restriction has been kept for making
the routing protocol simple ?

Regards,
manoj.

>From: James  Scott <jscott@calient.net>
>To: "'ccamp@ops.ietf.org'" <ccamp@ops.ietf.org>
>Subject: RE: SDH/SONET in GMPLS
>Date: Thu, 8 Nov 2001 17:30:11 -0800
>
>hi manoj,
>
>mj> As per SONET standard, each STS-1 SPE
>mj> is divided into 7 VT-groups. Each VT
>mj> group may contain 4 VT1.5, 3 VT-2s,
>mj> 2 VT-3s or 1 VT-6.  Furthermore, each
>mj> VT-group shall contain one size of VT.
>mj> however, each VT-group within STS-1 may
>mj> be of different VT-size. Does this type
>mj> of statement holds true for SDH also ?
>
>yes.  i don't recall that SDH spells out the
>rules on trib mixing explicitly as SONET does.
>however, the intent of the rules should be
>applicable to either protocol.  that being,
>to eliminate the possibility of inefficient
>usage of the columns within the trib group
>due to mismatched trib types being applied.
>
>mj> Is GMPLS supports this or it has some
>mj> restrictions for these configurations?
>
>draft-ietf-ccamp-gmpls-sonet-sdh-02.txt
>defines labels with VT/TU granularity as
>well as mappings/encodings for both
>contiguous and arbitrary concatenation.
>this should supply vendors with an adequate
>supply of rope.
>
>hope this helps.
>
>cheers,
>
>james
>
>
>


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