12-2
User
Guide
for
the
Cisco
Application
Networking
Manager
5.2
OL-26572-01
Chapte
r
12
Configuring
Network
Access
Information
About
VLANs
Information
About
VLANs
This
section
provides
an
overview
of
how
the
ACE
module
and
appliance
use
VLANs.
This
section
includes
the
following
topics:
•
ACE
Module
VLANs,
page
12-2
•
ACE
Appliance
VLANs,
page
12-2
ACE
Module
VLANs
The
ACE
module
does
not
include
any
external
physical
interfaces
to
receive
traffic
from
clients
and
servers.
Instead,
it
uses
internal
VLAN
interfaces.
You
assign
VLANs
from
the
supervisor
engine
to
the
ACE.
After
the
VLANs
are
assigned
to
the
ACE,
you
can
configure
the
corresponding
VLAN
interfaces
on
t
he
ACE
as
either
routed
or
bri
dged
for
use.
When
you
configure
an
IP
ad
dress
on
an
interface,
t
he
ACE
automatically
makes
it
a
routed
mode
interface.
Similarly,
when
you
configure
a
bridge
group
on
an
interface
VLAN,
the
ACE
automatically
makes
it
a
bridged
interface.
Then,
you
associate
a
bridge-group
virtual
interface
(BVI)
with
the
bridge
group.
For
more
information
on
bridged
groups
and
BVIs,
see
the
“Configuring
Virtual
Context
BVI
Interfaces”
section
on
page
12-19
.
The
ACE
also
supports
shared
VLANS,
which
are
multiple
interfaces
in
different
contexts
on
the
same
VLAN
within
the
same
subnet.
Only
routed
interfaces
can
share
VLANs.
Note
that
there
is
no
routing
across
contexts
even
wh
en
shared
VLANs
ar
e
co
nfigured.
Related
Topics
•
Configuring
VLANs
Using
Cisco
IOS
Software
(ACE
Module),
page
12-3
•
Configuring
Virtual
Context
VLAN
Interfaces,
page
12-6
•
Configuring
Virtual
Context
BVI
Interfaces,
page
12-19
•
Configuring
Virtual
Context
Static
Routes,
page
12-28
•
Configuring
Global
IP
DHCP,
page
12-29
ACE
Appliance
VLANs
The
ACE
appliance
has
four
physical
Ethernet
interface
ports.
All
VLANs
are
allocated
to
the
physical
ports.
After
the
VLANs
are
assigned,
you
can
configure
the
corresponding
VLAN
interfaces
as
either
routed
or
bridged
for
use.
When
you
configure
an
IP
address
on
an
interface,
the
ACE
appliance
automatically
makes
it
a
routed
mode
interface.
Similarly,
when
you
configure
a
bridge
group
on
an
interface
VLAN,
the
ACE
appliance
automatically
makes
it
a
br
idged
interface.
Then,
you
associate
a
BVI
with
the
br
idge
group.
The
ACE
appliance
also
supports
shared
VLANs,
which
are
multiple
interfaces
in
different
contexts
on
the
same
VLAN
within
the
same
subnet.
Only
routed
interfaces
can
share
VLANs.
Note
that
there
is
no
routing
across
contexts
even
when
shared
VLANs
are
configured.
In
routed
mode,
the
ACE
is
considered
a
router
hop
in
the
network.
In
the
Admin
or
user
contexts,
the
ACE
supports
static
routes
only.
The
ACE
supports
up
to
eight
equal
cost
routes
for
load
balancing.
