Subject: RE: MPLS and Tag Switching

From: [email-masked]
Date: Thu, 27 Jan 2000 16:48:34 +0100

Hi,

I would very much appreciate having a complete listing of the additional
features supported by MPLS
Even partial answer will help

Thanks in advance for your support,          jean

	Jean Conti

	Swisscom Ltd
	Major Accounts Consulting & Design
	49, rte de Meyrin
	CH-1211 Geneva 2  (Switzerland)

	Tel: +41 22 797 9716            Fax: +41 22 797 9996
Mobile: +41 79 236 1208      Email: [email-masked]
<mailto:[email-masked]> 

	-----Message d'origine-----
	De:	Aijaz Pathan [mailto:[email-masked]]
	Date:	jeudi, 27. janvier 2000 18:35
	À:	Nhat Thanh Hoang; 'David Curren'; [email-masked]
	Objet:	Re: MPLS and Tag Switching

	David,

	As Nhat correctly pointed out, there are additional features
supported by
	MPLS.

	The label format in the data plane is exactly similar for both tag
switching
	and MPLS, and hence the
	compliance by Cisco.

	However, there might be another angle to it. Cisco IOS supports TDP
(Tag
	Distribution Protocol) as the control
	protocol for distributing labels, which they say will be replaced by
	standard LDP and RSVP with extensions. So I think
	"Tag" implies TDP as control and MPLS implies LDP for most people
(Although
	it should not).

	BTW, Can anyone from Cisco confirm this, and also which versions of
the
	Cisco Router IOS supports TDP vs. LDP vs. RSVP?
	That would be of great help to atleast the 3 of us.

	Thanks

	-Aijaz
	----- Original Message -----
	From: Nhat Thanh Hoang <[email-masked]>
	To: 'David Curren' <[email-masked]>; <[email-masked]>
	Sent: Thursday, January 27, 2000 3:04 AM
	Subject: RE: MPLS and Tag Switching

	Hi, David

	Let me try to explain briefly: The MPLS technique is based on label
	switching i.e. on each LSR (MPLS enable router), it makes its
routing
	decision on the incoming label of the packet. In addition, MPLS
encompasses
	a lot of other features. Actually there is no difference between
Label
	Switching and Tag Swithing, except the name of tag instead of label
in
	Cisco's MPLS enabled Router which calls Tag Switching. Tag Switching
is
	implementation (approach) of MPLS techinque.
	I hope it would help, otherwise the other experts will elucidate for
you.

	regards,

	Nhat Thanh

***********************************************************************
	Telia Research AB
	Email [email-masked]
	Nhat Thanh Hoang         Telephone at work: 08-713 8178
	Krögarvägen 14              Mobile phone:        070-5242628
	14552 Norsborg Sweden Home:                   08-531 86 543
	
***********************************************************************

	Can someone help me understanding the major
	differences between Tag Switching and MPLS.
	The reason for this question is that Cisco says that
	there is no diference between both technologies.

	Regards,
	Dave
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