Cisco Small Business 200, Руководство администратора

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Spanning Tree
Defining Spanning Tree Interface Settings
Cisco Small Business 200 Series Smart Switch Administration Guide 198
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• BPDU Guard —Enables or disables the Bridge Protocol Data Unit (BPDU)
Guard feature on the port.
The BPDU Guard enables you to enforce the STP domain borders and keep
the active topology predictable. The devices behind the ports that have
BPDU Guard enabled cannot influence the STP topology. At the reception of
BPDUs, the BPDU guard operation disables the port that has BPDU
configured. In this case, a BPDU message is received, and an appropriate
SNMP trap is generated.
• BPDU Handling —Select how BPDU packets are managed when STP is
disabled on the port or the device. BPDUs are used to transmit spanning tree
information.
- Use Global Settings —Select to use the settings defined in the STP
Status and Global Settings page.
- Filtering —Filters BPDU packets when Spanning Tree is disabled on an
interface.
- Flooding —Floods BPDU packets when Spanning Tree is disabled on an
interface.
• Path Cost —Set the port contribution to the root path cost or use the default
cost generated by the system.
• Priority —Set the priority value of the port. The priority value influences the
port choice when a bridge has two ports connected in a loop. The priority is
a value from 0 to 240, set in increments of 16.
• Port State —Displays the current STP state of a port.
- Disabled —STP is currently disabled on the port. The port forwards
traffic while learning MAC addresses.
- Blocking —The port is currently blocked, and cannot forward traffic (with
the exception of BPDU data) or learn MAC addresses.
- Listening —The port is in Listening mode. The port cannot forward traffic,
and cannot learn MAC addresses.
- Learning —The port is in Learning mode. The port cannot forward traffic,
but it can learn new MAC addresses.
- Forwarding —The port is in Forwarding mode. The port can forward
traffic and learn new MAC addresses.