The MPLS WG Archive

["Prabakaran T Sampath" <prabakarts@future.futsoft.com>]

Hi,

 

Please find my in-lined comments [PrabakarTS].

 

Thanks and regards,

Prabakaran T.S.

Future Software Limited,

480-481, Anna Salai,

Chennai - 600035, India.

email : prabakarts@future.futsoft.com

Off Phone: +91-44-24330550

-----Original Message-----
From: owner-mpls@uu.net [mailto:owner-mpls@uu.net]On Behalf Of Anu Divya
Sent: Thursday, 22 January 2004 3:07 PM
To: mpls@uu.net
Subject: regrding GMPLS extension to ospf traffic engineering

Hi,

i have few doubts about how to use bandwidth information while calculating a constrined based path.

according to RFC 3630 (TE Extensions to OSPF version 2)
there are three kinds of bandwidth

2.5.6 Maximum Bandwidth.
2.5.7 Maximum Reservable Bandwidth.
2.5.8 Unreserved Bandwidth.

if an application ask for a constrined based path in which bandwidth constrain is X mbps.

now should i consider only those TE links which has Unreserved Bandwidth at particular priority greater than  X Mbps.
or i should also consider the Maximum Bandwidth (True Link Capacity).

my doubt is:-

whether the check should be like this
      Unreserved Bandwidth [priority]  >= X Mbps

or
      (Unreserved Bandwidth [priorit] >= X Mbps)  &&
      (Maximum Bandwidth >= X Mbps)
   

[PrabakarTS] In my understanding the check for the constraint should be,

     ( (Unreserved Bandwidth [priority] >= X Mbps)  &&
      (Maximum Reservable  Bandwidth >= X Mbps)) 
 

according to draft Routing Extensions in Support of generalised MPLS (draft-ietf-ccamp-gmpls-routing-06.txt)
there are two more bandwidth

Maximum LSP bandwidth.
Minimum LSP bandwidth.

now say if the application ask for a path in which bandwidth constrain is X Mbps.

now the check should be like this
    Minimum LSP bandwidth < X Mbps < Maximum LSP bandwidth

or

[PrabakarTS] The bellow one is more reasonable.  
    Minimum LSP bandwidth < X Mbps <
    minimum (Maximum LSP bandwidth, Unreserved Bandwidth)
     

Regards
 

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