Token Ring Fault Management - Cisco 7000 Series Hardware Installation And Maintenance

Connections
Network
Preparing
When
the token
busy
to
station
field
higher-priority
station
token
determine
lower
no more
back
Early
transmitting
bandwidth
default
Unlike
station
time
mechanisms
Token
Fault
Management
Ring
Token
faults
station
information
functions
on the ring
To
detect
frame
assumes
When
from
busy token
token
monitor
Other
the
active
which
Token
Whenever
beacon
failure
process
diagnostics
MAIJ
or
7000 Hardware
2-28 Cisco
token
is
circulating only
can
seize token
fields that
token with an information
can reserve the next token
When
the original sending
issues the
station
it
the reserving
Only
station
After the higher
station
priority
other higher-priority
that all
When
the
station
priority
traffic
higher-priority waiting
the ring
onto
token release allows
station
instead of waiting
on
the ring but decreases
TRIP
on any
not enabled
it is
CSMA/CD
networks such
maximum
hold the token for
can
any end
pass before
that will
discussed in the following
Ring networks
several
employ
For example one
station
which be any
can
potentially
for other ring
stations
and
include
detecting
token the active monitor
lost
traverse the ring completely
to
the token
that lost purges
is
device
fails its
sending
own
frames
their
transmitting
monitor
the active
sets
knows
with
bit
already set
it
the busy token
changes
on have
the ring the role of passive
stations
and assume
monitor
that
takes over the active monitor
station if
Ring called
algorithm
detects serious
station
frame The beacon frame
nearest active
its upstream
called autoreconfiguration
and
attempt to reconfigure
this
can
accomplish through
and Maintenance
Installation
with
stations
equal
priority
token
or reserve the next
frame
with
station
around
for the next pass
receives token with
station
new
free token with the
or another with an
station
and
seizes the token
are finished
stations
detects free token with the higher priority
and downgrades
the
new
release token
to
frame
the return
for to
first
The
TRIP
ring
reliability
ports
Ethernet token-passing
as
of
time
period so
be
able transmit
station will to
make
Token
section
mechanisms
for detecting
Token Ring network
the
in
on
the network
station
and
variety of ring maintenance
performs
correcting lost or
persistent
timeout greater than
uses
the active monitor
If
the ring of residual
any
frame
may circle
continuously
and
locking
essentially
on any
monitor
bit to
the transmitting
that
and
free token sends
to
monitor
role contention-resolution
if
necessary
fails
and
beaconing detects
tries
network
with the
problem
defines
failure domain
neighbor and
everything
where nodes
within the
network around
the
electrical
reconfiguration
or higher than the
to priority
Once the token seized
is
than the transmitting
higher
priority
the reservation
the network by
setting
field
the reservation
set
of the reserving
field set to that
priority
or higher can
equal
priority
transmission
completes
it
transmitting then
reinstate
assumes
it
of the token before
priority
onto the ring
immediately
This feature can help increase
early token
release
supports
are deterministic
networks
the
calculate
is to
possible
it
and
This the
management
fault
and
Ring networks robust
and compensating
for
the active
is
designated as
centralized
source
acts as
functions
busy
continuously circulating
the time required for the longest
does not see token
during
data and token
issues new
the ring other
preventing
network To
the detect
up
busy token
If
it
passing
failed
station to its packet
purge
back the ring
out
to
it
detect
their is to
primary job
algorithm
network
faults
to repair certain
break
such cable
as
which
includes the
station
between
in
initiates
Beaconing
domain
failure
automatically
the
failed
areas
Physically
value
in
and changed
for
seize the
must
it first
the previous
there
that
is
passing
it
after
the
total
but
by
Each
maximum
predictable
network
monitor
This
of timing
These
token
this time
it
stations
circulating
busy
sees
The
of
failure
determines
sends
it
the
reporting
perform
MSAU
the