Cabletron Systems Netlink FRX4000, User Manual

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4-8 FRX4000/FRX6000 4.0 User Guide, Rev 01
Local SAP Address
is a service access point (SAP) address used to identify the FRX4000/6000 to a
NetView host. This parameter is relevant only in a connection to a 3174 or AS/400-
type setup where a specific source SAP address is required. If the session will be run
over a native LLC2 frame relay interface, the parameter will be ignored.
Local MAC Address
identifies the local FRX4000/6000 to a NetView host. Like the local SAP address, this
parameter is relevant only in a connection to a 3174 or AS/400-type setup where a spe-
cific source MAC address is required. If the session will be run over a native LLC2
frame relay interface, the parameter will be ignored.
IDBLK
is used in conjunction with
IDNUM
in generating the Node field in an XID frame
(format 0 or 3) to establish a link station connection to the host. A further explanation
is provided under "
IDNUM
."
IDNUM
is used in conjuction with
IDBLK
in generating the Node field in an XID frame (format
0 or 3) to establish a link station connection to the host. If
0
is specified for both
IDBLK
and
IDNUM
, the Node field of the XID will be provided by the attached device. (The
node will send an XID command to the remote node to indicate that the device should
be polled for an XID.)
T1
is the Reply Timer, which is used to detect the failure to receive a required acknowl-
edgment or response from the remote link station. The link station 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
B
'
1
.' (If this LPDU is sent while the timer
is already running, the link station will reset and restart it.)
The link station will reset
T1
when it receives one of these:
●
A REJ (Reject) LPDU, provided a Command LPDU with P bit set to
B
'
1
' is not
outstanding.
●
A Response LPDU with the F bit set to
B
'
1
.'
●
An Information or Supervisory LPDU with an N(
R
) greater than the last N(
R
)
received and less than or equal to the line station's V(
S
), provided a Command
LPDU with P bit set to
B
'
1
' is not outstanding.
If additional LPDUs are set from the remote link station after the local station has reset
T1
, the timer will be restarted if acknowledgments of or responses to those LPDUs are
outstanding. If no acknowledgments/responses are outstanding, the link station will
start the inactivity timer (
Ti
).
If
T1
expires and acknowledgments/responses are still outstanding, the link station
will send one of the following, then restart
T1
:
●
A Supervisory LPDU with the P bit set to B'1' (to solicit remote link station
status).
●
Any Unnumbered LPDUs that were not responded to the first time they were
sent.