The MPLS-OPS Archive

[Stephen Mullaney <stephen.mullaney@parc-technologies.com>]

Alok,

 

DS-TE is actually something you would use with oversubscribed links.  The advantage of DS-TE is that you can keep traffic on links related to the different queues on those links.  So even if link A is oversubscribed, you can say that the voice queue/priority queue is never oversubscribed and as a result voice traffic is not effected by congestion.

 

DS-TE also allows you to look into upgrading links based on higher priority traffic only rather than all traffic.  This is a function of Diffserv but DS-TE extends the level of control you have so by using offline path computation tools, you can ensure that your high priority TE traffic can be carried without large network upgrades.

 

One side point, through DS-TE you can also look at using FRR to give you bandwidth protection of just important traffic rather than all traffic like in the SONET case.

 

Cheers

Stephen

 

-----Original Message-----
From: alok [mailto:alok.dube@apara.com]
Sent: 16 December 2002 10:30
To: ???; mpls-ops@mplsrc.com
Subject: Re: [MPLS-OPS]: I need DS-TE reference

Hi,

 

 

DS-TE is possible end to end when:

 

1. u dont have oversubscribed links

2. u have sufficent b/width to cater to each customer SLA without inet-serv reservations required

3. u may not want to add b/wdith in terms of "assymetric incremements", for example if one link is STM-1 and u need STM-1 +2Mb, u may need to add STM-1+STM-1 in DS-TE models....(someone could clarify on this better i guess) but inetserv models (basically RSVP and OSPF opaque LSAs help here)....someone knowing LDP better could help if the same exists for LDP.

 

the methodology is ...copy the ToS bits on the IP header onto the MPLS header...thats abt it i guess..

 

or simply mark the re define the ToS bits on the MPLS header.

 

so if u have "ample bandwdith" and dont have issues with all of the above, you could look at DiffServ TE, simply the same thing as Diffserv bits usage in IP scenarios.

 

-rgds

Alok

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

From: È«Èñ¼®

To: mpls-ops@mplsrc.com

Sent: Monday, December 16, 2002 3:16 PM

Subject: [MPLS-OPS]: I need DS-TE reference

 

Hello .. This is Suk

 

I need your help..

 

Can I get some information about reference site  building Diffserv-TE ?

 

What is the standard of classification...

 

Does DS-TE work well  End-to-End ( CE - CE ) ?

 

I am curious how DS-TE is used in real Network .

 

Many Thanks...