Troubleshooting
Overview
Troubleshooting Overview
This
section
describes
the troubleshooting
methods
used
in
this
chapter
and
defines
how
the router
is
divided
into
subsystems
for
more
efficient
problem
solving
Problem Solving
with
Subsystems
The
key
to
problem
solving
the
system
is
to
try
to
isolate
the
problem
to
specific
subsystem
The
first
step
in
solving
startup
problems
is
to
compare
what
the system
is
doing
to
what
it
should
be
doing
Since
startup
problem
is
usually
attributable
to
single
component
it
is
more
efficient
to
first
isolate
the
problem
to
subsystem
rather
than
troubleshoot
each
component
in the
system For
these
troubleshooting
procedures
consider
the following
subsystems
Power
subsystemThis
subsystem
comprises
the
power
supplies
the external
power cable and
the
backplane
Cooling
subsystemThis
subsystem
comprises
the
blower
module
which
includes
the
blower
the
blower
speed
control
board
the front-panel
LEDs
and
the
module
itself
The
blower
should
be
operating
whenever
the system
power
is
on
The
variable
speed
feature
allows
the
blower
to
operate
at
slower
speed
and
provide
quieter
operation
when
the
internal
chassis temperature
is
within
the
normal
operating
range
If
the
internal
temperature
exceeds
specified
temperature
the
blower
speed
increases
to
move
more
cooling
air
through
the chassis
As
result
it
may
be
difficult
to
determine
whether
or not
the
blower
is
operating
in
noisy
air-conditioned
rooms
If
you
determine
that
the
blower
is
not operating
contact
service
representative
immediately
There
are
no
installation
adjustments
that
you
should
make
if
it
does
not function
properly
at
initial
startup
Processor
subsystemThis
subsystem
includes
the
RSP2
and
all
interface
processors
The
RSP2
contains
the system
operating
software
in
an
onboard
Flash
memory
SIMM
or
on
Flash
memory card
and
the enabled
LED
on
each
interface
processor
indicates
whether
or not the
RSP2
was
able
to
initialize
it
Remember
that
an interface
processor
that
is
partially
installed
in
the backplane
might
cause
the
system
to
hang
and
crash
The
following
sections
will
help
you
isolate
problem
to
one
of these
subsystems
and
direct
you
to
the appropriate
troubleshooting
section
Identifying
Startup
Problems
When
you
start
up
the router for the
first
time you
should
observe
the
startup
sequence
described
in
the section
Starting
the
Router
in
the chapter
Installing
the
Router
This
section
contains
more
detailed
description
of the
nonnal
startup
sequence
and
describes
the steps
to
take
if
the
system
does
not
perform
that
sequence
as
expected
By
checking
the
state
of the
LEDs
on
the
power
supplies
and
processor
modules
the
RSP2
and
interface
processors
you
can
determine
when
and where
the system
failed
in
the
startup
sequence
Use
the following
descriptions
to isolate
the
problem
to
subsystem
then
proceed
to
the appropriate
sections
indicated
in
each
description
to
try
to
resolve
the
problem
Troubleshooting
the
Installation
4-3
Summary of Contents for 7513 Series
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