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Re: Off-Topic doubt

  • From: Sonali.Francis@lntinfotech.com
  • Date: Fri, 31 Jan 2003 09:27:38 +0530
  • Cc: "Alexandre Carlos" <alexandre@redes.unb.br>, mpls-ops@mplsrc.com
  • Resent-Date: Fri, 31 Jan 2003 01:04:55 -0500
  • To: Wulf Losee <qx49@attbi.com>
  • X-MIMETrack: Serialize by Router on BANGALORE1/LNTINFOTECH(Release 5.0.9 |November 16, 2001) at01/31/2003 09:35:24 AM,Itemize by SMTP Server on LTITLOUT/LNTINFOTECH(Release 5.0.11 |July 24, 2002) at01/31/2003 10:03:56 AM,Serialize by Router on LTITLOUT/LNTINFOTECH(Release 5.0.11 |July 24, 2002) at01/31/2003 10:04:10 AM,Serialize complete at 01/31/2003 10:04:10 AM


One may need to configure a loose ER-LSP, when LSP is intersecting an AS,
whose complete topology is not known.
Strict ER-LSP can be configured, when one is sure of all intermediate hops.

Pls correct me if I am wrong...

Sonali



                                                                                                           
                      Wulf Losee                                                                           
                      <qx49@attbi.com>         To:       "Alexandre Carlos" <alexandre@redes.unb.br>       
                                               cc:       <mpls-ops@mplsrc.com>                             
                      31/01/2003 04:12         Subject:  Re: [MPLS-OPS]: Off-Topic doubt                   
                      AM                                                                                   
                                                                                                           
                                                                                                           




Alexandre:
Strict and loose routes are subcategories of explicit routes -- which is a
route specified as a list of hops that must be part of the route (but not
necessarily all of the route) used. A If an explicit route is strict,
*only* the specified hops may be used. Note: a hop can be a node, an
abstract node, or an Autonomous System. And in a strict route, the hops
must be used in the order specified by the route.

If an explicit route is loose, all specified hops must be included in the
resulting path, but the path is otherwise unrestricted -- in other words, a

loose route must include all of the hops specified, and must maintain the
order, but it may also include additional hops as necessary to reach the
hops specified.

And once a loose route has been established it can be modified (as a
hop-by-hop route could be) or it can be "pinned" so that it does not
change.

Now, the next question is, under what circumstances would it be better to
use a loose route vs. a strict route? Can anyone on the list clarify?

cheers!
--Wulf

At 07:04 PM 1/30/03 -0300, Alexandre Carlos wrote:
>Hi all,
>
>Can some one explain to me what what is a strict route and a loose one?
>
>Alex
>
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