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Known Restrictions
311523-C Rev 00
9
• MultiLink Trunking
MultiLink Trunking allows you to group ports of varying speeds (for example,
you can group 10 Mb/s, 100 Mb/s, and 1000 Mb/s ports in any combination).
Although this is a valid configuration, Nortel Networks recommends that you
only group ports of equivalent speeds when configuring a trunk. The
MultiLink Trunk algorithm distributes connections across all of the available
links in the trunk, regardless of speed.
• Monitoring outgoing frames on trunk member ports
When you monitor outgoing frames on a full-duplex port that is a MultiLink
trunk member, Nortel Networks recommends that you use the address-based
mirroring mode. If you use port-based mirroring with this type of
configuration, some frames may not be displayed.
• MultiLink Trunking interoperability with Accelar
*
When a Distributed MultiLink Trunk (DMLT) is connected to an Accelar
switch, and you reset one of the stack units or change the spanning tree status
of the DMLT, each unit sends out a (standalone) BPDU frame through the
DMLT port. This can cause Accelar switches with software versions prior to
V2.0.5 to disable the DMLT.
If this happens, reset the Accelar switch. If resetting the Accelar switch does
not correct the problem, contact your Nortel Networks Technical Solutions
Center (see “How to Get Help” in
Using the BayStack 450 10/100/1000 Series
Switch
).
• BayStack switches automatically calculate the path cost for any given port,
based on the port’s speed and duplex settings. If you manually change the
path cost setting, the switch no longer automatically calculates the path cost
for that port.
• Spanning Tree Participation value disabled for monitor port
When you use the Port Mirroring feature in a standalone switch configuration,
the Spanning Tree Participation value for the monitor port is automatically set
to Disabled. If you then insert the same standalone switch into a stack, the
Spanning Tree Participation value for the previously configured monitor port
remains
Disabled. You must manually reset the Spanning Tree Participation
value to Normal Learning or Fast Learning using the Spanning Tree Port
Configuration screen.