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CMTSLoadBalanceOverviewBy
Zhimin
ZhangCMTSLoadBalanceOverviewByZ1HowLBusually
workEach
LBG
contains
some
DS/US
channel.When
modem
is
registered,
it
will
be
assigned
to
a
LBG
(
except
legacy
LBG.)CMTS
check
the
balance
status
periodically,
if
not
balanced,
move
some
modem
to
lower
load
channel.HowLBusuallyworkEachLBGco2HowtomeasurebalancestatusModem
countWhether
modem
number
is
balanced
across
channels.Utilization
Whether
traffic
load
is
balanced.Service
flow(notsupportanymore)Whether
service
flow
number
is
balanced.The
load
is
counted
base
on
channel,
not
only
within
LBG.“show
cable
load
load”HowtomeasurebalancestatusM3Modemmovestrategy
(When
and
how
many
times
to
move)StaticLBMove
modem
once
after
registeredDynamic
LBMove
modem
whenever
not
balanced.Passive
LBCMTS
ignore
the
register
for
modem
on
overload
channelModemmovestrategy
(Whenand4Howtomovemodem
(message
send
to
modem)DCCMove
primary
DSDBCMove
both
primary
and
bonding
group.UCCMove
upstream
onlyInit
tech
0-4,
configurable.Howtomovemodem(messagesen5LBTypesLegacyLoadBalancing(Notsupportedinnewrelease)Can’tdifferentiateindividualmodemDocsisLoadBalancingD2.0GLBG(D2.0modems)D3.0GLBG(D3.0modems)RLBG(both2.0/3.0)Modem
will
be
assigned
to
a
load
balance
group
to
take
effect.“show
cable
load-balance”LBTypesLegacyLoadBalancing6HowtocreateLBG2.0GLBG/RLBGusethesamecommand,butRLBGhasarestrictkeywordcableload-balancedocsis-group1restricted
downstreamModular-Cable7/1/0rf-channel0-7upstreamCable7/1/00-33.0
GLBG
are
created
automatically
when
FN
is
created.
Can’t
be
created
by
CLI,
but
parameter
can
be
changed.HowtocreateLBG2.0GLBG/RLBG7LegacyLoadBalancingCiscoprivatesolution.Not
process
each
individual
modem
after
registered.No
LBG
assignment.LegacyLoadBalancingCiscopr8DocsisLB–
AssignmentRLBG
has
the
highest
priorityIf
a
modem
does
not
match
the
RLBG,
then
it
will
be
assigned
to
GLBG
base
on
DOCSIS
version
and
channel
set.2.0
modem
is
assigned
to
2.0
GLBG.3.0
modem
is
assigned
to
3.0
GLBG.RLBG
can
match
tagging,
oui,
docsis-version,
service
type,
cliGLBG
are
assigned
by
channel
set.DocsisLB–AssignmentRLBGhas9To
save
the
system
resourceSince
there
may
be
tens
of
thousands
of
modems.LB
will
not
move
modem
in
real
time,
it
will
check
the
balance
status
after
every
specific
interval.Default
30s.“interval”.TosavethesystemresourceSin10Toreduceping-pongeffect(flap)In
a
platform
with
unstable
modems
offline/online,
cmts
will
always
found
it’s
un-balanced
and
try
to
move
modem.Traffic
statistics
has
a
delay,
so
CMTS
may
move
to
many
modems
to
another
channel
and
have
to
move
it
back
in
next
interval.Threshold
is
used
to
accept
somewhat
un-balance.
So
that
it
will
not
waste
unnecessary
resource.“threshold”Toreduceping-pongeffect(fl11Treatvoice/videodifferentBy
default,
modem
that
has
special
service
will
not
be
moved
by
LB.
But
this
can
be
changed
by
“policy”
command.Thisistoensuretheservicequality.“policy”Treatvoice/videodifferentBy12Wedon’twantaspecificmodemto
bemovedExclude
command“docsis-policy”
could
be
used
to
disable
a
modem
being
moved
permanently
or
for
some
period.“docsis-policy”Wedon’twantaspecificmodem13ContinueFor
utilization
based,
move
a
modem
that
with
high
traffic
will
be
more
efficient
because
less
modem
needs
to
be
moved.But
if
the
traffic
is
very
high,
such
as
75%
of
a
channel,
then
better
not
to
move
it,
because
it
may
make
other
channel
overload
as
well.“disable-throughput-lowerbound”
to
define
what
is
high
load
modem.Upperbound
not
support
yet.ContinueForutilizationbased,14WemaywantsomemodemsmovedfirstSome
modem
may
have
some
important
service,
so
if
possible,
move
other
modems
first.LB
priority
in
modem
config
file.Wemaywantsomemodemsmoved15DynamicD3.0LBCurrently
support
static/dynamic
LB
for
NB
modems.Currently
support
static
LB
for
WB/UB
modems.Now
we
are
trying
to
support
dynamic
LB
for
WB/UB
modems.DynamicD3.0LBCurrentlysuppo16AlotofexceptionforLBCase1：Channel-1has15%traffic,channel-2
has
1
percent,
threshold
is
1%.
Modem
will
be
moved
from
channel-1
to
channel-2.
But
since
channel-1
usage
is
also
very
low,
it’s
not
needed
to
move
modem
at
all.“min-threshold”
is
used
to
avoid
unnecessary
modem
move.AlotofexceptionforLBCase17CMTSLoadBalanceOverviewBy
Zhimin
ZhangCMTSLoadBalanceOverviewByZ18HowLBusually
workEach
LBG
contains
some
DS/US
channel.When
modem
is
registered,
it
will
be
assigned
to
a
LBG
(
except
legacy
LBG.)CMTS
check
the
balance
status
periodically,
if
not
balanced,
move
some
modem
to
lower
load
channel.HowLBusuallyworkEachLBGco19HowtomeasurebalancestatusModem
countWhether
modem
number
is
balanced
across
channels.Utilization
Whether
traffic
load
is
balanced.Service
flow(notsupportanymore)Whether
service
flow
number
is
balanced.The
load
is
counted
base
on
channel,
not
only
within
LBG.“show
cable
load
load”HowtomeasurebalancestatusM20Modemmovestrategy
(When
and
how
many
times
to
move)StaticLBMove
modem
once
after
registeredDynamic
LBMove
modem
whenever
not
balanced.Passive
LBCMTS
ignore
the
register
for
modem
on
overload
channelModemmovestrategy
(Whenand21Howtomovemodem
(message
send
to
modem)DCCMove
primary
DSDBCMove
both
primary
and
bonding
group.UCCMove
upstream
onlyInit
tech
0-4,
configurable.Howtomovemodem(messagesen22LBTypesLegacyLoadBalancing(Notsupportedinnewrelease)Can’tdifferentiateindividualmodemDocsisLoadBalancingD2.0GLBG(D2.0modems)D3.0GLBG(D3.0modems)RLBG(both2.0/3.0)Modem
will
be
assigned
to
a
load
balance
group
to
take
effect.“show
cable
load-balance”LBTypesLegacyLoadBalancing23HowtocreateLBG2.0GLBG/RLBGusethesamecommand,butRLBGhasarestrictkeywordcableload-balancedocsis-group1restricted
downstreamModular-Cable7/1/0rf-channel0-7upstreamCable7/1/00-33.0
GLBG
are
created
automatically
when
FN
is
created.
Can’t
be
created
by
CLI,
but
parameter
can
be
changed.HowtocreateLBG2.0GLBG/RLBG24LegacyLoadBalancingCiscoprivatesolution.Not
process
each
individual
modem
after
registered.No
LBG
assignment.LegacyLoadBalancingCiscopr25DocsisLB–
AssignmentRLBG
has
the
highest
priorityIf
a
modem
does
not
match
the
RLBG,
then
it
will
be
assigned
to
GLBG
base
on
DOCSIS
version
and
channel
set.2.0
modem
is
assigned
to
2.0
GLBG.3.0
modem
is
assigned
to
3.0
GLBG.RLBG
can
match
tagging,
oui,
docsis-version,
service
type,
cliGLBG
are
assigned
by
channel
set.DocsisLB–AssignmentRLBGhas26To
save
the
system
resourceSince
there
may
be
tens
of
thousands
of
modems.LB
will
not
move
modem
in
real
time,
it
will
check
the
balance
status
after
every
specific
interval.Default
30s.“interval”.TosavethesystemresourceSin27Toreduceping-pongeffect(flap)In
a
platform
with
unstable
modems
offline/online,
cmts
will
always
found
it’s
un-balanced
and
try
to
move
modem.Traffic
statistics
has
a
delay,
so
CMTS
may
move
to
many
modems
to
another
channel
and
have
to
move
it
back
in
next
interval.Threshold
is
used
to
accept
somewhat
un-balance.
So
that
it
will
not
waste
unnecessary
resource.“threshold”Toreduceping-pongeffect(fl28Treatvoice/videodifferentBy
default,
modem
that
has
special
service
will
not
be
moved
by
LB.
But
this
can
be
changed
by
“policy”
command.Thisistoensuretheservicequality.“policy”Treatvoice/videodifferentBy29Wedon’twantaspecificmodemto
bemovedExclude
command“docsis-policy”
could
be
used
to
disable
a
modem
being
moved
permanently
or
for
some
period.“docsis-policy”Wedon’twantaspecificmodem30ContinueFor
utilization
based,
move
a
modem
that
with
high
traffic
will
be
more
efficient
because
less
modem
needs
to
be
moved.But
if
the
traffic
is
very
high,
such
as
75%
of
a
channel,
then
better
not
to
move
it,
because
it
may
m
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