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Spanning Tree
Configuring STP Interface Settings
STEP 4
Cisco Small Business SG200 Series 8-port Smart Switches Administration Guide
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Filtering—Enables the port to discard BPDUs received on interfaces that
are not enabled for STP.
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Flooding—Allows flooding of BPDUs received on non-spanning-tree
ports to all other non-spanning-tree ports.
•
Path Cost—Specify the port path cost. The cost of a path to the root bridge
is the sum of the costs of all ports in the path. The path cost is used to
forward traffic when a path is being rerouted. Select Use Default to set the
path cost to the port speed. Or select User Defined to set a custom value
between 0 and 200,000,000. A value of zero means the path cost is set
according to the port's speed.
Click Apply and then click Close. Your changes are saved to the Running
Configuration.
The new configuration appears in the STP Interface Settings Table along with the
following information about the port/LAG.
•
Edge Operational Status—Indicates if a port is currently operating as an
edge port (or PortFast port). This indicates Enabled if the port is in the
forwarding state due to either of the following configurations:
-
The port is configured as an Edge Port and is therefore automatically in
the forwarding state.
-
The port is configured as an Auto Edge port and, because it has not
received BDPUs, has transitioned to forwarding state.
•
Port State—Current STP state of a port. If enabled, the port state
determines the forwarding action that is taken on traffic. Possible port states
are:
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Disabled—STP is currently disabled on the port. The port does not
participate in the spanning tree, but is in an operational state to learn
MAC addresses and forward traffic.
-
Discarding—Port is currently blocked and cannot be used to forward
traffic or learn MAC addresses.
-
Learning—Port is currently in the learning mode. The port cannot
forward traffic, however, it can learn new MAC addresses.
-
Forwarding—Port is currently in the forwarding mode. The port can
forward traffic and learn new MAC addresses.
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