The MPLS WG Archive

Cell Relay Retreat>MPLS WG Archive>month:2001-Nov> msg00018



[Date Prev][Date Next][Thread Prev][Thread Next]  
  [Date Index][Thread Index][Author Index][Subject Index]

EXP<=>PHBID maps in DIFFSERV Object

  • From: Vishal M <vishal_study@yahoo.com>
  • Date: Mon, 5 Nov 2001 20:04:16 -0800 (PST)


Hello,

The DIFFSERV Object defined in "MPLS Support for
DiffServ, version 09.txt", Section 5.2 defines MAP
sub-fields that carries EXP <==> PHBID mappings for a
given LSP.

Are these mappings specified anywhere ? What EXP value
would map to what PHBID ?

Is it network administrator's responsibility for
guarantee the uniqueness/consistancy of such mappings
? 

Consider the following:

      ----LSR1 ----> LSR 2 <----- LSR3-----

LSR1 advertises EXP 4 ==> PHB AF12 map to LSR2
LSR3 advertises EXP 4 ==> PHB CS2 map to LSR2

How would LSR 2 handle these ? 

Only way one could guarantee this is if the LSP is
within a particular domain, in which case consistency
can be guaranteed (by a single network admin). 

But if LSP is crossing domain boundaries, it could be
an issue. Not sure if network operators are really
into these inter-domain LSPs at this point...

Could someone please comment on this.

Thanks,
Vishal.



__________________________________________________
Do You Yahoo!?
Find a job, post your resume.
http://careers.yahoo.com