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Cajun P550/P880/P882 Switch User Guide
Using VLANs, Spanning Tree, Hunt Groups, and VTP Snooping
4-17
Disabling Spanning Tree Mode for the Port
You can disable Spanning Tree mode for the port from either the
web agent or the CLI.
* Note: When disabling the STP for a port, BPDUs received on that
port are ignored and are not generated. The port moves
directly into the forwarding state from the disabled state
and does not trigger a topology detection change.
For ports that have a 3Com® trunking format, the
receiving end of the trunked port attempts to interpret the
clear BPDUs as trunked packets. Consequently, these
BPDUs are discarded at the receiving end. For Spanning
Tree to function properly with 3Com trunked ports, the
Spanning Tree mode should be set to per-VLAN. In per-
VLAN Spanning Tree, there is one instance of Spanning
Tree for each VLAN and the BPDUs are tagged with the
VLAN ID, ensuring they are interpreted correctly on the
receiving end.
Although this restriction does not apply to ports that use
IEEE 802.1Q or Multi-Layer trunking modes, it is still
recommended that you set Spanning Tree to per-VLAN
when using trunked ports. This prevents an entire link from
being blocked when there is a loop in one VLAN.
If you have an ATM Uplink module installed, and there is a
loop through the uplink, the ATM Uplink module does not
function properly if you use IEEE802.D.
Disabling
Spanning Tree
Mode for the
Port Using the
Web Agent
To disable spanning tree mode for the port using the web agent:
1. Select Configuration from the Modules and Ports web agent
window. The Module Information dialog box opens
(Figure4-10).