external
switch.
When
a
LAG
group
is
configured
correctly
in
both
the
BladeCenter
unit
and
the
adjoining
device,
the
spanning
tree
protocol
treats
the
group
as
a
single
link.
Link
aggregation
example:
As
shown
in
Figure
44
the
two
Link
Aggregation
Groups
from
a
BladeCenter
unit
are
connected
to
separate
Layer
2
or
Layer
3
switches.
This
provides
a
redundant
path
in
case
of
a
link
or
switch
failure.
Typically
the
BladeCenter
Ethernet
switch
module
ports
are
attached
to
one
of
the
following
types
of
switch:
v
A
layer
2
stack
switch
(1
Gbps
ports
with
a
high-speed
(10
Gbps)
link
to
a
layer
3
router.
v
A
layer
2
or
3
chassis
switch
with
integrated
L3
switching
or
routing.
Ports
can
be
grouped
through
VLANs.
v
A
layer
3-7
router
or
load-balancing
switch.
Link
aggregation
control
protocol
recommendations
LACP
exchanges
information
between
a
pair
of
stations
on
a
point-to-point
link
aggregation
group
to
ensure
proper
operation.
A
communication
path
is
not
established
unless
both
stations
are
configured
correctly
and
the
port-to-port
cables
are
installed
on
a
subset
of
configured
ports,
or
all
of
the
configured
ports.
For
the
purpose
of
this
discussion,
the
stations
are
defined
as
the
BladeCenter
Ethernet
switch
ports
and
an
adjoining
layer
3
external
switch.
These
parameters
must
be
correctly
defined
for
both
stations:
v
Define
the
ports
for
the
Link
Aggregation
Group
and
define
the
Group
ID
v
Assign
the
same
Administrative
Key
to
each
port
within
a
group
Switch A
Mgmt
Mod A
Switch B
1
2
3
4
5
6
7
8
9 10 11 12 13 14
Switch A
Mgmt
Mod A
Switch B
1
2
3
4
5
6
7
8
9 10 11 12 13 14
Switch A
Mgmt
Mod A
Switch B
1
2
3
4
5
6
7
8
9 10 11 12 13 14
L2 Switch
L2+ Switch
L2+ Switch
Multiport aggregation group
1 Gbps or 100 Mbps links
10/100 Mbps
management
links
Dual
external
switches
Establishment
backbone
IBM Director
- Chassis management
- Application deployment
- Internal switches
Network administrator
- Infrastructure
management
- Network hardware
and software
Figure
44.
Recommended
network
topology
with
multi-port
link
aggregation
groups
82
BladeCenter
Type
8677:
Planning
and
Installation
Guide
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