Nortel Networks 100 manual Known Problems

Known Problems

•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.

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