The MPLS-OPS Archive

[Spice Sylvia <falsesylvia@yahoo.co.uk>]

Hi,

 

i agree, but what purpose does the PSN in the middle serve?

 

The same multipoint thing could be done using channelised interfaces (and maybe making the ability to channelise more granular)

 

Eitherways the customer has to by a CPE which can "switch"

 

How does adding an PSN in the middle help?

"M. ELK" <elkou141061@hotmail.com> wrote:

Hi Spice

Reg :
Quote
Why would he not buy a Layer 3 switch (if what he wants is ethernet) , take
a link and connect it off to the SDH/SONET multiplexer provided by the SP
and use the same? What is the benefit he gets by terminating at a Packet
switching kind of device on the SP end?
Unquote

In this case it is not Virtual any more ie: not a VPN , the customer is
running his own Private
network leasing SDH/PDH B.W from a provider . Sure VPN provide a lower cost
solution .

Another point , Providing Ethernet service was also forseen by the
manufacturer of the
Sonet/SDH but as far as i undersatnd it did not fly (do not why) .
Their is several standrad in this area ( ITU-T G.7041 , ITU-X.86 ...etc )
Have a look to Tellabs web site , they have several white paper explaining
this solution
(Choosing the best ! of Today's Eternet over SDH standards , Ethernet Over SDH
Technologies
..etc ). The simplest solution is Ethernet Private Leased line where the
customer is allocated
multiple of VC-12 instead of leasing the pre-defined E1/E3/T3/STM1...etc .

Brgds


>From: Spice Sylvia
>To: sthaug@nethelp.no, robert.mccallum@thus.net
>CC: mpls-ops@mplsrc.com
>Subject: RE: [MPLS-OPS]: Question about L2VPN over MPLS
>Date: Tue, 23 Mar 2004 22:11:15 +0000 (GMT)
>
>Hi Steiner,
>
>I agree L2VPN does have a market [forgive the sarcasm but so does poison
>:)].
>
>The point I do not quite get is why would the end user want a termination
>point on a Packet switching device with the SP?
>
>Are you saying that the cost difference between buying a Layer 2 switch
>versus a Layer 3 switch is "so highly significant"?
>
>Why would he not buy a Layer! 3 switch (if what he wants is ethernet) , take
>a link and connect it off to the SDH/SONET multiplexer provided by the SP
>and use the same? What is the benefit he gets by terminating at a Packet
>switching kind of device on the SP end?
>
>
>sthaug@nethelp.no wrote:
> > The real problem with VPLS lies not in the technology but the actual
> > SLA that you can offer the customer. Just ask Cisco the question
> > and all you get back is "we would never recommend a vpls solution
> > due to the SLA issues". This is the main reason Cisco are very slow
> > to market with VPLS as they don't actually belive there is a "real"
> > requirement for it.
>
>It is not obvious to me that VPLS has SLA problems. Also, there are
>other vendors than Cisco (for instance Juniper), with more mature VPLS
>solutions.
>
> > Please don't mix this up with L2vpn as this is completely different.
> > Point to point L2vpns (especially ethernet) are at the moment the
> > hot sell for my company. In the space of 1 year we have sold
> > hundreds of these types of links throughout the whole of Britain.
>
>Well, I work for a company that also sells both point to point *and*
>point to multipoint L2. As far as we can see, there's a market for
>both types of solutions.
>
> > If the customer wants any-any connectivity I would always push them
> > down the L3VPN solution. I would also offer them OSPF, RIPv2 or
> > EIGRP (something which our company differs on other SP's).
>
>I would also in most cases push L3 solutions - mostly because I find
>them easier to debug. But there's definitely a market for L2 point to
>multipoint.
>
>Steinar Haug, Nethelp consulting, sthaug@nethelp.no
>
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