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Known Problems
311523-C Rev 00
13
• Downgrading your BayStack 450-12F switch
You cannot downgrade your BayStack 450-12F switch or a stack
configuration that contains a BayStack 450-12F switch, to a software version
earlier than software version V1.3. Software versions earlier than V1.3 do not
support the BayStack 450-12F switch.
• Software versions earlier than V3.1.0 do not support:
-- Mixed stacks that include Business Policy Switches
-- BayStack 450-2M3/2S3 (ATM MDAs).
• Stack reset when creating the first DMLT
When you create your first DMLT using SNMP management, your stack can
reset without warning. This reset is required to enable only the first DMLT in
a stack.
Known Problems
The following problems are known to exist in software version V4.0.0 (and earlier
versions):
• If you are running IGMP multicast traffic over a DMLT while the IGMP
snooping feature is disabled, the IGMP traffic that is received on one link of
the DMLT will be looped back onto another link of the trunk.
To break the loop, disconnect one link of the DMLT or enable the IGMP
snooping feature.
• When using 1000BASE-XD and 1000BASE-ZX (long-haul) GBICs in your
450-1GBIC MDA, the System Characteristics screen
incorrectly
shows the
GBIC devices as “Unsupported.” However, the GBIC devices operate
properly and pass traffic correctly.
•MDAs must be
firmly secured
in the chassis for proper operation. Be sure to
secure the MDA in the chassis by
firmly
tightening the two thumbscrews on
the MDA front panel.
• A link state cannot be established when you connect a cable that is 100
percent utilized into a BayStack 450 switch port. As soon as a break in the
traffic occurs, the link state is established.