Subject: question related to DS-TE-PROTO: Does advertised unreserved bw ta ke LOM into account ?

From: "Choudhury, Sanjaya" <[email-masked]>
Date: Thu, 28 Mar 2002 13:42:18 -0500

Hi! Here is a question related to DS-TE-PROTO-3 draft. 
  
   Is the following assumption correct ?

   The  per-TE-Class unreserved bandwidth advertised by IGPs, are
   the actual bandwidth available for the TE-Class [i.e _without_ taking
   the LOM into account.] 

   The PCM of the a LSR may use the advertised unreserved BW and 
   value from the LOM TLV, to decide (/predict), whether it should use
   a specific link.

   A simplistic example: 
      (i)   Assume the actual link bw 100M
      (ii)   Only CT0 is supported (and only 1 preemption priority
supported)
     (iii)  LOM[0] = 200%
    
     Case-1: No LSPs have been established

                 Assumption:
                 -------------
	      In this case the Adv bw is   100M  (and not 200M)
                  [Although 200M worth of CT0 connections can be 
                   established]

      Case-2: 1 LSP with 50M bandwidth has been established
 
                  Assumption:
                  --------------
                  In this case the Adv bw is  = 100 -50/2 = 75M (and not 200
-50 = 150M)
             
Thanks,
sanjay