Cabletron Systems MMAC-Plus 9F116-01, Руководство пользователя, Страница: 57 / 420

Configuring Node Parameters 3-11
If acknowledgments/responses are still outstanding after
N2
tries (see "
N2
"), the link
station will declare the link inoperative.
The value specified for
T1
should allow for any delays introduced by the MAC sub-
layer (e.g., queuing).
T2
is the Receiver Acknowledgment Timer, used by the link station to delay sending an
acknowledgment of a received Information LPDU. The timer is started when the
LPDU is received and reset when the acknowledgment is sent. If the timer expires
before the acknowledgment is sent, it must be sent as soon as possible.
Ti
is the Inactivity Timer, used by the link station to detect an inoperative condition in
either the remote link station or the transmission medium. The timer will be started if
T1 has been reset (for one of the reasons listed under "
T1
" earlier), and additional
LPDUs have been sent by the remote link station, and there are no outstanding
acknowledgments or responses from the local link station.
If the local station does not receive an LPDU before
Ti
expires, the station must send
an LPDU with the P bit set to
B
'
1
' to solicit the remote station's status. Recovery then
proceeds as described under "
T1
" earlier.
N3
is the number of Information LPDUs that will be received before sending an acknowl-
edgment. This parameter is used in conjunction with
T2
to allow stations to reduce
traffic. A counter is initialized to N3, and will be decremented by one each time a valid
sequential Information LPDU is received. When the counter reaches
0
an acknowl-
edgment is sent.
N3
is reset whenever an Information or Supervisory acknowledgment LPDU is sent by
the local station.
Tw
is the maximum number of sequentially numbered Information LPDUs that the link
station can have outstanding.
N2
is the maximum number of times that an LPDU (including Information LPDUs resent
after a checkpoint operation) will be sent following expiration of
T1
.
Priority
prioritizes NetView traffic among all intra-nodal traffic; the higher the number, the
higher the priority. (This priority has no effect on traffic exiting an FRX/FRM.)
A priority is also configured for each logical port, SNA PU, Bridge port, LLC2 host,
LLC2 interface, IP interface, IPX interface, SVC subscriber, and PVC connection.
The device processor in the FRX/FRM uses these priorities to help determine the order
in which it will process protocols.
Bandwidth Allocation Group
assigns NetView sessions to one of sixteen groups whose parameters regulate band-
width usage. See "Configuring Bandwidth Allocation Groups" on page 6-6.