3com 7600 Benutzerhandbuch
15-2
C
HAPTER
15: S
YSTEM
M
ODES
, A
TTRIBUTES
,
AND
T
UNING
Cut-Through Mode
Cut-through mode enables a frame to be forwarded to a destination
address even before the entire frame has been received. You can
configure the required number of cells to be received before transmission
starts.
address even before the entire frame has been received. You can
configure the required number of cells to be received before transmission
starts.
Refer to Figure 15-1 for a comparison of Store-and-Forward and
Cut-Through modes.
Cut-Through modes.
Figure 15-1 Cut-through vs. Store-and-Forward Mode
Timeout Tuning
Timeout tuning is used for assigning timeout delays for both hardware
and software. These parameters are used to avoid cells being stuck in the
7600 Card for extended periods of time. This usually occurs when the
frame was not assembled correctly and is too long, or the last cell of the
frame was not received from the ATM ports. The timeout mechanism only
applies to frames arriving from the ATM on their way to the Ethernet
ports or the software. The mechanism gets rid of these frames by
terminating them as erred frames.
and software. These parameters are used to avoid cells being stuck in the
7600 Card for extended periods of time. This usually occurs when the
frame was not assembled correctly and is too long, or the last cell of the
frame was not received from the ATM ports. The timeout mechanism only
applies to frames arriving from the ATM on their way to the Ethernet
ports or the software. The mechanism gets rid of these frames by
terminating them as erred frames.
abtthgde.book Page 2 Tuesday, June 23, 1998 10:29 AM