Re: Label Set Object

["Vinay Vernekar" <vinay.vernekar@wipro.com>]

Hi Zafar,

The Label Set Object can't be sent to constrain the downstream label when the LSP encoding type is Sonet/SDH. Consider the example where a request is sent to downstream with SONET/SDH traffic parameters as NVC=n and MT=m. The label expected from the downstream would be 'm' set of labels each set consisting of 'n' labels further that identify each of the virtual concatenated components. So a Label Set in this scenario would consist of say 'p' sets each consisting of 'm' sets of 'n' labels. Such a Label Set cannot be encoded using the object/TLV structure of Label Set as in "Generalized MPLS - Signalling Functional Description - draft-ietf-mpls-generalized-signaling-08.txt". 

Label Set Object can be sent only in WDM scenario where a single wavelength is requested as a label and the upstream has a restriction on the usable wavelengths.

Correct me if I am going wrong anywhere.

 

Regards

Vinay   

----- Original Message -----

From: Zafar Ali

To: Manoj Agiwal ; 'Ccamp (E-mail)

Cc: mpls@UU. NET (E-mail)

Sent: Wednesday, May 08, 2002 11:04 AM

Subject: Re: Label Set Object

At 10:00 AM 5/8/2002 +0530, Manoj Agiwal wrote:

Hi ,
       In gmpls signaling extensionsions for RSVP-TE , ccamp architecture on
gmpls has described Label Set object usage
    only for the "optical" domain viz. for carrying wavelengths ( Section
9.9 draft-ietf-ccamp-gmpls-architecture-02.txt) .

       Do we require to send Label set(i.e. time slots) for TDM switching as
well . In what way it can be useful .

Dear Manoj,

Yes, label set object is also useful in TDM case. E.g., SONET poses an additional requirement that the two interfaces of a bidirectional LSP SHOULD traverse the exact same link with the same SUKLM values for the two directions.
 The label set object can be used to constrain the downstream label to the same as the upstream label.

Thanks

Regards... Zafar

Regards ,
Manoj

===============
Zafar Ali
Cisco Systems
(734) 276-2459
100 S Main St. #200
Ann Arbor, MI 48104.
email: zali@cisco.com

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