8-76
User
Guide
for
the
Cisco
Application
Networking
Manager
5.2
OL-26572-01
Chapte
r
8
Configuring
Real
Servers
and
Server
Farms
Configuring
Health
Monitoring
Configuring
an
OID
for
SNMP
Probes
You
can
configure
OID
queries
t
o
probe
t
he
server.
When
t
he
ACE
sends
a
pr
obe
with
an
SNMP
OID
query,
the
ACE
uses
the
retrieved
value
as
input
to
the
least-loaded
algorithm
for
load-balancing
decisions.
Least-loaded
load
balancing
bases
the
server
selection
on
the
server
with
the
lowest
load
value.
If
the
retrieved
value
is
within
the
configured
threshold,
the
server
is
marked
as
passed.
If
the
threshold
is
exceeded,
the
server
is
marked
as
failed.
The
ACE
al
lows
a
maximum
of
ei
ght
OID
queries
to
pr
obe
the
ser
ver.
Assumption
An
SNMP
probe
has
been
configured.
See
the
“Configuring
Health
Monitoring
for
Real
Servers”
section
on
page
8-51
for
more
information.
Procedure
Step
1
Choose
Config
>
Devices
>
context
>
Load
Balancing
>
Health
Monitoring
.
The
Health
Monitoring
t
able
ap
pears.
Step
2
In
the
Health
Monitoring
table,
choose
the
SNMP
probe
for
which
you
want
to
specify
an
OID.
The
SNMP
OID
for
Server
Load
Query
table
appears.
Step
3
In
the
SNMP
OID
for
Server
Load
Query
table,
click
Add
to
add
an
entry,
or
choose
an
existing
entry
and
cl
ick
Edit
to
modify
it.
The
SNMP
OID
configuration
pane
appears.
Step
4
In
the
SNMP
OID
field
of
the
SNMP
OID
configuration
pane,
enter
the
OID
that
the
probe
is
to
use
to
query
the
server
for
a
value.
Valid
entries
are
unquoted
strings
with
a
maximum
of
255
alphanumeric
characters
in
dotted-decimal
notation,
such
as
.1.3.6.1.4.2021.10.1.3.1.
The
OID
string
is
based
on
the
server
type.
Step
5
In
the
Max.
Absolute
Server
Load
Value
field,
enter
the
OID
value
in
the
form
of
an
integer
and
to
indicate
that
the
retrieved
OID
value
is
an
absolute
value
instead
of
a
percent.
Valid
entries
ar
e
fr
om
1
t
o
4294967295.
When
the
ACE
sends
a
probe
with
an
SNMP
OID
query,
the
ACE
uses
the
retrieved
value
as
input
to
the
least-loaded
algorithm
for
load-balancing
decisions.
By
default,
the
ACE
assumes
that
the
retrieved
OID
value
is
a
percentile
value.
Use
this
option
to
specify
that
the
retrieved
OID
value
is
an
absolute
value.
Step
6
In
the
Server
Load
Threshold
Value
field,
specify
the
threshold
at
which
the
server
is
to
be
taken
out
of
service
as
follows:
•
When
the
OID
value
is
based
on
a
percent,
valid
entries
are
integers
from
1
to
100.
•
When
the
OID
is
based
on
an
absolute
value,
valid
entries
are
from
1
to
the
value
specified
in
the
Maximum
Absolute
Server
Load
Value
field.
Step
7
In
the
Server
Load
Weighting
field,
enter
the
weight
to
assign
to
this
OID
for
the
SNMP
probe.
Valid
entries
ar
e
fr
om
0
t
o
16000.
Step
8
Do
one
of
the
following:
•
Click
Deploy
Now
to
deploy
this
configuration
on
t
he
ACE
and
save
your
entries
t
o
the
running-configuration
and
startup-configuration
files.
•
Click
Cancel
to
exit
this
procedure
without
saving
your
entries
and
to
return
to
the
SNMP
OID
table.
