3Com CoreBuilder 3500, Command Reference Manual

Page: 230 / 784

230 C
HAPTER
8: F
IBER
D
ISTRIBUTED
D
ATA
I
NTERFACE
(FDDI)
fddi path
✓
3500
✓
9000
9400
3900
9300
tvxLowerBound
Specifies the minimum time value (in microseconds) of fddiMAC tvxValue
that any MAC that is configured in this path uses.
Valid Minimum Abbreviation
fd pa tv
Important Considerations
■
A MAC uses its valid transmission timer (TVX) to detect and recover
from certain ring errors. If a valid frame has not passed through a
MAC during the time indicated by fddiMACTvxValue, the MAC
reinitializes the ring.
■
By adjusting the tvxLowerBound value, you specify how quickly the
ring recovers from an error. The lower you set this value, the faster the
network reacts to problems, but the ring might be reinitialized when
there is no problem.
■
The higher you set this value, the less chance of frequent
reinitializations, but the network takes longer to recover from errors.
■
You can use this command to configure the same setting on multiple
ports simultaneously. When you specify multiple port numbers, the
system prompts you to choose the setting and then applies it to all of
the ports.
Options
Prompt Description Possible Values [Default]
Ports One or more FDDI station ports
for which you want to set the
tvxLowerBound
■
Any of the
available
ports on the
installed FDDI
modules
■
all
–
Path Path that you want to set:
■
A DAS port has primary and
secondary paths.
■
A SAS port has only a
primary path.
■
p (primary)
■
s (secondary)
■
all
–
tvxLowerBound Minimum time value of
fddiMAC tvxValue that any
MAC that is configured onto
this path uses
0 – 4294967295
microseconds 2500