Cisco 7000 Series Hardware Installation And Maintenance page 70

When
the token
to busy
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
the ring
on
To
detect
frame
assumes
When
from
busy token
token
monitor
Other
the active monitor
which
Token
Whenever
beacon
failure
process
diagnostics
MAU
or
token
is circulating only
seize token
that
can
fields
information
token with an
next token
reserve
the
can
When
the original sending
issues the
station
it
the reserving
Only station
After the higher
station
priority
other higher-priority
that all
When
the detects
station
priority
higher-priority traffic waiting
the ring
onto
token release allows
station
instead of waiting
for
the ring but decreases
on
on any TRIP
not enabled
it is
CSMAICD
networks such
maximum
hold the token for
can
end
before
that will any
pass
discussed the following
in
several
Ring networks employ
For example one
station in the
which be
potentially can
stations
other ring
for
include and
detecting correcting
token the active monitor
lost
traverse the ring completely
to
the token
that
lost purges
is
frame
device
its
sending fails
own frames
their
transmitting
the active monitor
sets
knows
with
bit set
it
already
the token
busy
changes
have
on the
stations the
ring
and assume
that
takes the active monitor
over if
station
called beaconing
Ring
algorithm
detects serious
station
frame
frame The beacon
active upstream
nearest
its
called autoreconfiguration
and
to
attempt reconfigure
this
can
accomplish through
with
stations
equal
priority
token
the
or reserve next
frame with
station
higher
the next pass around the
for
receives token with
station
new with the
token
free
priority
another with
station an
or
seizes and
the token
completes
finished transmitting then
stations are
token with
free the
and downgrades
the
priority
new
release token onto
to
frame
return This
the to
first
TRIP
The
ring
reliability
ports
Ethernet token-passing
as
of
time
so
it
period
be able transmit
station will to
make
Token
section
mechanisms
for
detecting
Token Ring network
is
on the network
station
any
and variety of ring
performs
lost
or
persistent
timeout greater than
uses
active monitor does
If the
residual
the ring of
any
may continuously circle
and
locking
essentially up
on
monitor
bit to
any passing
that the transmitting station
and
sends
token
to free
it
of passive monitor
role their
contention-resolution
role if
necessary
fails
detects and
tries to
network
with
the
problem
which
defines
failure domain
and
neighbor everything
where
nodes within
the failure
network
around the
the
electrical
reconfiguration
Preparing
than
the
or higher
to
priority
Once
the token seized and
is
than
the
transmitting
priority
the reservation
network by
setting
reservation
the field for
set
of
field to that the
set
or higher can
equal
priority
it transmission it
reinstate the
assumes
that
it
higher priority
of the token before
passing
the ring immediately
after
feature can help increase
token
supports release
early
networks are deterministic
calculate
to the
possible
is
and
This the management
fault
and
Ring networks robust
predictable
and compensating network
for
monitor
the active
designated as
centralized
as source
acts
maintenance
functions
circulating
busy continuously
time required
the for
token
this
not see
during
token
new
data and issues
other
the ring
preventing
network To
detect
the circulating
busy token
If sees
it
packet
failed to its
purge
back
out
to the ring
detect
is to
primary job
determines
algorithm
faults
network
certain
repair
such break
cable
as
includes the station
reporting
between initiates
in Beaconing
domain
automatically
the
areas
failed
Physically
Preparing
Network Connections
value
in
changed
reserving
the
seize
must
first
previous
there
is
it
total
the
but
by
Each
maximum
This
of timing
These
token
the longest
time
it
stations
busy
The
of
failure
sends
it
the
perform
MSAU
for Installation 2-19