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[AUDIO LOGO]

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So now let's jump in and
take a more detailed look

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at the different types of layer
2 VPNs that are available.

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We're going to
start off by looking

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at a list of, really, two
major VPN types and all

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the different names
that they share,

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depending on the particular
vendor or organizing body.

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So let's go ahead and
take a look at that.

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And then, of course, we'll
dig into those two types

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in a little bit more detail
to understand the differences

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and how they work.

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So let's go ahead and jump in,
taking a look at that table.

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So a sort of interesting
aspect about layer

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2 VPN types is
these types actually

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have different names depending
on the organization, meaning

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either the standards
body or the vendor.

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So if we bring up a
little table here,

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we have two major
flavors of layer 2 VPNs.

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We have the point to point,
which the Metro Ethernet Forum,

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or MEF, refers to as an E-Line.

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Then we have the multipoint,
which is referred to as E-LAN.

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Now, just focusing on the
point to point for a moment,

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they're also referred
to as Ethernet Private

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Lines, or EPLs, Ethernet
Virtual Private Lines, or EVPLs.

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The IETF refers to these
as the Virtual Private Wire

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Service, which is how we
referred to them earlier, VPWS.

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These Cisco-specific
terms over here

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are actually pretty legacy.

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But they also did refer
to these as Ethernet Wire

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Service, or EWS, and Ethernet
Relay Service, or ERS.

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The multipoints are referred
to as Transparent LAN Service,

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or TLS, Ethernet Virtual
Connection Service, or EVCS.

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Of course, again,
earlier, we used

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this term, the Virtual
Private Lan Service, VPLS.

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And once again, Cisco call these
Ethernet Multipoint Service,

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or EMS, or Ethernet Relay
Multipoint Service, ERMS.

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So again, there's
two major types--

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the point to point
and the multipoint.

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And even though we've been
using the IETF phrasing up

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until now, actually,
the MEF names

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are more commonly used today.

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Again, the one I would
say is really not

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used at all is pretty
much the Cisco terms.

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But I would probably be familiar
with the terms E-Line and VPWS

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as well as E-LAN and VPLS, and
know that those are effectively

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the same thing.

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Something else that's a bit
important to discuss here,

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as we're talking
about connections

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with the customer and
different VPN types,

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is the flexible
ethernet mapping.

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Effectively, what
this does is it

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allows us to process and
classify various Ethernet frame

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types.

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We can do this either
by EtherType field--

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so maybe IPv4 versus IPv6,
something along those lines.

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Very commonly, we do
this with a VLAN tag

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to distinguish different
types of traffic.

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And we can also do it with
the Class of Service field,

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which is, of course,
generally used for QoS.

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Now, the reason
this is important

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to our current
discussion of VPN type

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is I could actually
offer different VPN

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types to the customer and have
just one physical link going

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out to that customer.

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This service allows
me to differentiate

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between the traffic coming in on
the interface from the customer

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and therefore treat
it differently.

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Maybe it goes into one VPN
that gets one type of treatment

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or a different VPN that gets
a different type of treatment.

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Maybe it's different
types of VPNs.

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So it's important to be able to
distinguish the traffic coming

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from the customer in
order to be able to put it

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into the correct VPN
based on the service

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that they've requested.

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Now, on the Cisco
ASR 9000 Series

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and a couple of
other platforms, this

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is referred to as an Ethernet
Flow Point, or an EFP.

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Each of these flows
from the customer--

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or you could call
it the access side--

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is mapped or connected to a
service on the trunk side.

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This is what's allowing us
to offer different services,

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maybe put them into a separate
VPN, that sort of thing.

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The Customer Equipment
or the CE, device

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connects to the carrier
Ethernet network,

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which is, of course, the
service provider network,

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using the UNI, or the
User-Network Interface.

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The UNI is essentially the
interface facing the customer.

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That would be on the PE router.

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And we did mention this before
that the attachment circuit

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is between the CE and the
UNI or the PE interface.

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So again, the two major types--

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first, we have the point
to point, or the E-Line.

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This can actually either
be locally connected, which

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would be two EFPs on
the same platform using

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native Ethernet-- so basically,
if you had a customer connected

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to the same PE and you
needed to connect their two

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sites together.

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More commonly, of
course, we would

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be doing Ethernet over MPLS.

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This is going to involve
those two EFPs but this time

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on different platforms.

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And the connection
between them is

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going to be using
Pseudo Wires, or PWs.

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So that's two different ways
of offering the customer

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a point-to-point connection.

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For point to multipoint,
or E-LAN, again,

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there's still sort of two ways.

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One is we could
do local bridging.

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This would be two or more
EFPs on the same platform.

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And it's going to use,
again, native Ethernet.

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But we're going to put
this into a bridge domain.

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If you're not familiar
with a bridge domain,

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it's effectively a layer
2 broadcast domain.

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This is actually very
similar in concept to a VLAN.

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But it's just a construct
on the device that

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lets us put multiple
interfaces into a single layer

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2 environment, where all
the devices can communicate

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with each other
without necessarily

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carrying that stigma of
a VLAN or a VLAN tag.

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But overall, it's
the same sort of idea

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that they're all in the same
layer 2 broadcast domain.

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When we get to VPLS
bridging, we'll

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notice, once again, it's
almost the same idea here,

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where it's two or more EFPs.

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This time, of course, they're
on the different platforms.

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But they're also
in a bridge domain.

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These are then connected with
a full mesh of those pseudo

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wires.

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That's what's going to make
it a multipoint connection.

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So in this video, we
took a more detailed look

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at the different types of
VPNs that we have available.

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Just to be very
generic about it,

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it's essentially point-to-point
or multipoint layer 2 VPNs.

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Those are our two
major categories.

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So now it's going to be
time to jump into more

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detail on each one of those.

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So we're going to
start with VPLS.

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We're going to
start off by talking

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about the details
on that type of VPN.

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And that's exactly what
we're going to do next.

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Until then, I hope this has
been informative for you,

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and I'd like to thank
you for viewing.

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