© Copyright Lenovo 2018
Chapter 16: Static Multicast ARP
273
Chapter 16. Static Multicast ARP
The
Microsoft
Windows
operating
system
includes
the
Network
Load
Balancing
(NLB)
technology
that
helps
to
balance
incoming
IP
traffic
among
multi
‐
node
clusters.
In
multicast
mode,
NLB
uses
a
shared
multicast
MAC
address
with
a
unicast
IP
address.
Since
the
address
resolution
protocol
(ARP)
can
map
an
IP
address
to
only
one
MAC
address,
port,
and
VLAN,
the
packet
reaches
only
one
of
the
servers
(the
one
attached
to
the
port
on
which
the
ARP
was
learnt).
To
avoid
the
ARP
resolution,
you
must
create
a
static
ARP
entry
with
multicast
MAC
address.
You
must
also
specify
the
list
of
ports
through
which
the
multicast
packet
must
be
sent
out
from
the
gateway
or
Layer
2/Layer
3
node.
With
these
configurations,
a
packet
with
a
unicast
IPv4
destination
address
and
multicast
MAC
address
can
be
sent
out
as
per
the
multicast
MAC
address
configuration.
NLB
maps
the
unicast
IP
address
and
multicast
MAC
address
as
follows:
Cluster
multicast
MAC
address:
03
‐
BF
‐
W
‐
X
‐
Y
‐
Z;
where
W.X.Y.Z
is
the
cluster
unicast
IP
address.
You
must
configure
the
static
multicast
ARP
entry
only
at
the
Layer
2/Layer
3
or
Router
node,
and
not
at
the
Layer
2
‐
only
node.
Lenovo
ENOS
supports
a
maximum
of
20
static
multicast
ARP
entries.
Note:
If
you
use
the
ACL
profile
or
IPMC
‐
OPT
profile,
an
ACL
entry
is
consumed
for
each
Static
Multicast
ARP
entry
that
you
configure.
Hence,
you
can
configure
a
maximum
of
256
ACL
and
multicast
MAC
entries
together.The
ACL
entries
have
a
higher
priority.
In
the
default
profile,
the
number
of
static
multicast
ARP
entries
that
you
configure
does
not
affect
the
total
number
of
ACL
entries.
Summary of Contents for ThinkSystem NE2552E
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