Cisco 7513 Hardware Installation And Maintenance Manual page 98

priority
use the ring
to
passing
stations
the
by
station
When
the token
busy
to
station
When
field
higher-priority
station
token
determine
previous lower
there
that
passing
token
Early
transmitting
bandwidth
default
Unlike
station
time
that
mechanisms
Token
Fault
Management
Ring
Token
faults
station
information
functions
token on
To
detect
frame
to
assumes
When
from
transmitting
busy token
token with
monitor
Other
stations
the active monitor
which
scheme
allows the user
to
more
than
frequently
token with
higher
priority
seize the token
to soon
as as
station that the token
generates
receives
and
it the
as
passes
token
circulating only stations
is
can token
fields seize that
token with an information
can reserve the next token
for
the
station
sending
original
new
issues the
station
it
the reserving
Only station
or another
After the higher-priority
station
other higher-priority
that
all
When
the
priority station
no more
is
higher-priority
back
onto the ring
it
release allows
station
instead of waiting
the
for
on the ring
but decreases
TRIP
is on any
not enabled
it
CSMAJCD
networks such
as
maximum
can hold the token for
any end
pass before
will station
discussed the following
in
networks
several
Ring employ
For example
one
the
station in
which
be any
potentially can
and
other ring
for stations
and
include
detecting
correcting
the ring
the active monitor
token
lost
traverse the ring completely
the token
that is lost purges
frame
device
sending
fails its
own frames
their
the active monitor
sets
knows
bit
it
already set
the
changes busy token
to
the ring
on have
the role of passive
and assume
role
that
takes
station
over the active monitor
if
designate any station high priority
as
stations Stations
lower-priority
own
than
designated
its
priority
The frame
token contains
possible
and which
reservation
field
token
with
to
equal
priority
token
or reserve the next
Once
frame with
station
higher
the next
around
the network
pass
receives
token with the reservation
free token with the
priority
with
station an
equal
and
seizes the token
completes
are finished
stations
transmitting
free token with
detects
and downgrades
traffic
waiting
new
release token the ring immediately
to
onto
frame
This
return
first to
The
TRIP
ring supports
reliability
ports
Ethernet networks
token-passing
of time so
is
period it possible
be
able transmit
will to
make
Token
section
Ring
mechanisms
for detecting
and compensating
Token
Ring network
is
designated
on the network
station
acts
variety of ring
performs
lost or persistently
busy
uses timeout greater than
the active monitor does not see
If
data and
the ring of any residual
the
may circle
continuously
and
the
locking
up
essentially
monitor
on any
bit to
passing
the transmitting
that station
and back
free token sends
it
monitor
their
contention-resolution
if
necessary
fails
Network
Preparing
which
allows the
station
seize or reserve
cannot
which
allows
highest-priority
which
apriorily field
be
can by
set
higher-priority
or higher than the value
priority
and changed
the token seized
is
than the transmitting
priority
by the reservation
setting
field set for
of the reserving
field set to that
or higher can seize
priority
must
transmission
it it
and
then
the
reinstate
the higher assumes
priority
it
the
of the token before
priority
after
feature can help increase the
early token but
release
Each
deterministic
are
maximum
calculate the
to
and
This the
fault
management
and
networks robust
predictable
network
for
monitor
the active
as
centralized source of timing
as
maintenance These
functions
continuously
circulating
the time required for the longest
token time
this
during
token
issues new
other
stations
ring
preventing
network To
detect
circulating
busy token
If sees busy
it
failed
to The
its packet
purge
out the ring
to
is to detect
failure
primary job
determines
algorithm
Preparing for Installation
Connections
set
is
in
the
first
total
by
This
it
of
2-33