The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: MPLS L2 VPN end L3 VPN
hi Sid,
First of all I would not use routing word in the Layer 2
VPN. May be my view might be very narrow to ethernet
as Layer 2, another assumption is that the provider n/w is
MPLS enabled.
Probably a word like learning shall be appropriate. Actually,
what happens is that whole of the provider network becomes
a kind of bridge and does adaptive learning. Something as follows:
site3 site5
\ /
\ /
Site1 ----- MPLS enabled Provider N/w ----- Site2
/ \
/ \
site4 site6
so when first frame is sent over the Provider Network then
then it shall be flooded to all sites and later on the basis of from
which site/segment the frame came in, it will learn all this and
update its bridging table (if i can call it so).
So, this is how learning shall take place in the layer 2 VPN
and no routing :-))
Thanks & Regards
Tarun B
_________________________________________________
Tarun Bhalla
Wipro Technologies
26 Hosur Main Road,
Bommanahalli,
Bangalore- 560 068. India
Tel +91-80-5732293, Extn 3139 <http://www.wipro.com/>
----- Original Message -----
From: <sid2k3@netscape.net>
To: ""Tarun Bhalla"" <tarun.bhalla@wipro.com>
Sent: Friday, March 28, 2003 10:51 AM
Subject: Re: [MPLS-OPS]: MPLS L2 VPN end L3 VPN
Hi Tarun,
my question is How routing decisions are made in layer 2 vpn? Will there be
a pre established LSP?
Regards,
Sid
"Tarun Bhalla" <tarun.bhalla@wipro.com> wrote:
>hi Alex,
>
>Layer 2 VPN broadly refers to operation of VPN on layer 2 only.
>
>I will consider a simple example to make the understanding clear:
>Lets say the toplogy is something like this:
>
>Customer Site 1 ----------------- VPN (Layer 2) ---------------- Customer
>Site 2
>
>Now, when an ISP says to the customer that he/she(ISP) shall provide
>him/her (customer) Layer 2 VPN then it means that the customer site 1 can
>send layer 2 pkts (ethernet frames) to customer site2 using this Layer 2
>VPN.
>Basically, no IP thing is involved here and with no routes at all (at the
>customer
>edges), the two sites shall be able to reach each other. No ROUTING is
>happening
>in Layer 2 VPN (not digressing from the main topic, but yeah! bridge
>learning does
>happen in Layer 2 VPN).
>
>Customer Site 1 ----------------- VPN (Layer 3) ---------------- Customer
>Site 2
>
>Whereas when we talk about Layer3 VPN, routing shall transport pkts from
>site1 to site2.
>
>I hope I have brought the meaning clear :-)).. also this is my
understanding
>any difference
>in opinions are more than welcome :))
>
>Thanks & Regards
>Tarun B
>_________________________________________________
>Tarun Bhalla
>Wipro Technologies
>26 Hosur Main Road,
>Bommanahalli,
>Bangalore- 560 068. India
>Tel +91-80-5732293, Extn 3139 <http://www.wipro.com/>
>
>
>----- Original Message -----
>From: "Alexandre Carlos de Oliveira" <alexandre@redes.unb.br>
>To: <mpls-ops@mplsrc.com>
>Sent: Thursday, March 27, 2003 7:46 AM
>Subject: [MPLS-OPS]: MPLS L2 VPN end L3 VPN
>
>
>> Can some one tell me whats the difference between L2 VPN and L3 VPN?
>>
>> Alex
>>
>>
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