© Copyright Lenovo 2018
Chapter 9: Ports and Link Aggregation (LAG)
167
Configurable LAG Hash Algorithm
Traffic
in
a
LAG
is
statistically
distributed
among
member
ports
using
a
hash
process
where
various
address
and
attribute
bits
from
each
transmitted
frame
are
recombined
to
specify
the
particular
LAG
port
the
frame
will
use.
The
NE2552E
uses
the
RTAG7
model
for
LAG
hashing.
The
switch
can
be
configured
to
use
a
variety
of
hashing
options.
To
achieve
the
most
even
traffic
distribution,
select
options
that
exhibit
a
wide
range
of
values
for
your
particular
network.
Avoid
hashing
on
information
that
is
not
usually
present
in
the
expected
traffic
or
which
does
not
vary.
The
NE2552E
supports
the
following
hashing
options,
which
can
be
used
in
any
combination:
For
Layer
2
traffic,
one
of
the
following
combinations
may
be
applied:
Source
MAC
address
(
smac
)
Destination
MAC
address
(
dmac
)
Both
source
and
destination
MAC
address
(enabled
by
default)
Note:
At
least
one
Layer
2
option
must
always
be
enabled;
The
smac
and
dmac
options
may
not
both
be
disabled
at
the
same
time.
For
Layer
3
IPv4/IPv6
traffic,
one
of
the
following
are
permitted:
Source
IP
address
(
sip
)
Destination
IP
address
(
dip
)
Both
source
and
destination
IP
address
(enabled
by
default)
If
Layer
2
hashing
is
preferred
for
Layer
3
traffic,
disable
the
Layer
3
sip
and
dip
hashing
options
and
enable
the
useL2
option:
NE2552E(config)#
portchannel thash l2thash l2-source-mac-address
NE2552E(config)#
portchannel thash l2thash l2-destination-mac-address
NE2552E(config)#
portchannel thash l2thash l2-source-destination-mac
NE2552E(config)#
portchannel thash l3thash l3-source-ip-address
NE2552E(config)#
portchannel thash l3thash l3-destination-ip-address
NE2552E(config)#
portchannel thash l3thash l3-source-destination-ip
NE2552E(config)#
portchannel thash l3thash l3-use-l2-hash
Summary of Contents for ThinkSystem NE2552E
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