Lucent Technologies Cajun Switch P220 - Manual (Page 22)

Cajun P220, P550, P550R Switch Release Notes, Release 4.0.1 22
Redundant Controller Support
In the event that the redundant switch controller fails, the switch will reset itself.
Auto-Negotiation
Some network cards do not auto-negotiate correctly with older releases of the 10/100TX
modules. This is evidenced by the reception of CRC errors on the mirror port. To avoid this
situation, disable auto-negotiation and manually configure the speed and duplex of the mirror
port and network card.
Spanning Tree
IEEE 802.1D Spanning Tree
IEEE 802.1D spanning tree does not work with 3Com tags.
Web Configuration
The Disable Spanning Tree option available from the “spanning tree> vlan> port” the Cajun
Switch Web Agent disables the port. To disable Spanning Tree mode for the port, use the
“Modules and Ports > Switch Ports” Web page. When disabling the Spanning Tree for a port,
BPDUs received on that port are ignored and BPDUs are not generated by the switch for that
port. The port will move directly into the forwarding state from the disabled state. The port does
not trigger a topology detection change.
Setting the Spanning Tree Mode
When the Spanning Tree mode is set to IEEE 802.1D, BPDUs are sent out ports in Clear (non-
trunked) format even if the port has a trunking format (3Com, IEEE 802.1Q, or Dual-Layer)
defined.