Chapter 9 — Troubleshooting and Support
Detect Topology Errors
September 2017
User Guide
—
Spectra Verde Array
152
For
example,
to
verify
the
connectivity
from
the
switch
to
the
IP
address
192.168.2.10,
run
the
command
shown
below
from
the
switch
command
line
or
client:
ping 192.168.2.10
All
ICMP
Echo
requests
should
receive
replies
including
information
about
the
round
trip
time
it
took
to
receive
the
response.
A
response
of
0
msec
means
that
the
time
was
less
than
1
ms.
If
the
request
times
out,
then
check
the
settings
on
the
switch
to
which
the
Verde
master
node
is
connected.
Traceroute
You
can
use
the
traceroute
command,
if
it
is
available,
or
something
similar
to
not
only
verify
connectivity
to
a
remote
network
node,
but
to
track
the
responses
from
intermediate
nodes
as
well.
The
traceroute
command
sends
a
UDP
packet
to
a
port
that
is
likely
to
not
be
used
on
a
remote
node
with
a
TTL
of
1.
After
the
packet
reaches
the
intermediate
router,
the
TTL
is
decremented,
and
the
ICMP
time
‐
exceeded
message
is
sent
back
to
the
originating
node,
which
increments
the
TTL
to
2,
and
the
process
repeats.
After
the
UDP
packet
reaches
a
destination
host,
an
ICMP
port
‐
unreachable
message
is
sent
back
to
the
sender.
This
action
provides
the
sender
with
information
about
all
intermediate
routers
on
the
way
to
the
destination.
For
example,
in
the
output
of
the
command
shown
below,
traceroute 192.168.2.10
displays
a
numbered
list
indicating
how
many
hops,
on
the
way
from
the
switch
to
the
Verde
master
node,
are
encountered
when
tracing
the
packet.
D
ETECT
T
OPOLOGY
E
RRORS
The
Verde
array
automatically
analyzes
the
connections
between
the
array
and
the
tape
library.
If
any
topology
errors
are
detected,
an
informational
message
is
displayed
on
the
Topology
page.
To
check
for
any
topology
errors,
from
the
menu
bar,
select
Support >
Tools > Topology
.
The
Topology
page
displays.
Any
topology
errors
are
listed
on
the
page.
Figure 118
The Topology page.