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Release Notes for the BayStack 450 10/100/1000 Series Switch
10
311523-C Rev 00
• IEEE 802.1D spanning tree parameters
Spanning tree parameters cannot be configured from the console interface
(CI) menus and screens.
Configuration support is available through the Bridge MIB using Simple
Network Management Protocol (SNMP). Refer to RFC 1493 for more
information.
• The spanning tree configuration must be the same on both ends of a MultiLink
trunk.
• Spanning tree port participation
The Fast Learning value (used with the Participation field in the Spanning
Tree Port Configuration screen) is the same as the Normal Learning value,
except that the state transition timer is shortened to two seconds.
Nortel Networks recommends using the Fast Learning value to optimize
switch-to-endstation connections. When you connect one switch to another
switch, the Normal Learning (default) value provides the best results.
• MAC address-based security learning process
If you move a device from one port to another during the MAC address-based
security learning process, the device’s MAC address will move to the new port
and will no longer be allowed on the original port. A given MAC address can
be learned on only one port at a time.
• The BayStack 450-2M3 and the BayStack 450-2S3 MDAs do not support
MAC-based security, Autotopology protocol, and EAPOL.
• You cannot assign an
untagged
port to multiple protocol VLANs that have the
same protocol ID.
• Redundant gigabit Phy
You cannot use the redundant gigabit Phy port (the backup Phy port) to create
two different paths.
• Autonegotiation restriction with gigabit ports
The BayStack 450 switch’s gigabit MDA ports comply with IEEE 802.3z
Draft 3.2 and IEEE 802.3z Draft 4.1; however, the following restriction
applies to the autonegotiation feature:
-- Autonegotiation does not restart if an invalid code word is received from the
link partner during the autonegotiation process. In cases where
autonegotiation fails, disable and then enable autonegotiation.