Cabletron Systems Netlink FRX4000 User Manual page 165

T1
T2
Ti
Configuring SNA
is the Reply Timer, which is used by the local node to detect a failure by the remote
station to send a required acknowledgment or response. The local node will start the
timer when it transmits one of these:
an Information LPDU (LLC protocol data unit).
a Command LPDU with the P bit set to
is already running, the local node will reset and restart it.)
The node will reset
T1
A REJ (Reject) LPDU, provided a Command LPDU with the P bit set to
not outstanding.
A Response LPDU with the F bit set to
An Information or Supervisory LPDU with an N
received and less than or equal to the line station's V
LPDU with the P bit set to
If additional LPDUs are set from the remote station after the local node has reset
the timer will be restarted if acknowledgments of or responses to those LPDUs are out-
standing. If no acknowledgments/responses are outstanding, the local node will start
the inactivity timer. (See "
If expires and acknowledgments/responses are still outstanding, the local node will
T1
send one of the following, then restart
A Supervisory LPDU with the P bit set to
status.
Any Unnumbered LPDUs that were not responded to the first time they were
sent.
If acknowledgments/responses are still outstanding after
local node will declare the link inoperative.
The value specified for
layer (e.g., queuing).
is the Receive Acknowledgment Timer, used by the local node to delay sending an
acknowledgment of a received Information LPDU. Delaying acknowledgments for as
long as possible minimizes the number of acknowledgments that must be sent (since
more than one received frame can be acknowledged with one transmission). The timer
will be started when the LPDU is received and reset when the acknowledgment is sent.
If the timer expires before the acknowledgment is sent, it should be sent as soon as
possible.
is the Inactivity Timer, used by the local node to detect an inoperative condition in
either the remote link station or the transmission medium. The timer will be started if
has been reset (for one of the reasons listed under "
T1
LPDUs have been sent by the remote link station, and there are no outstanding
acknowledgments or responses from the local node.
If the local node does not receive an LPDU before
LPDU with the P bit set to
proceed as described under "
B'1.'
when it receives one of these:
is not outstanding.
B'1'
")
Ti.
:
T1
should allow for any delays introduced by the MAC sub-
T1
to solicit the remote station's status. Recovery will then
B'1'
"
T1.
(If this LPDU is sent while the timer
B '1.'
greater than the last N
R
, provided a Command
S
to solicit remote link station
B'1,'
tries (see that entry), the
N2
" earlier), and additional
T1
expires, the node will send an
Ti
is
B'1'
R
,
T1
9-23