Cisco Cisco SG200-26P 26-port Gigabit PoE Smart Switch Manuel De Maintenance
Spanning Tree
Configuring STP Status and Global Settings
Cisco Small Business SF200E Series Advanced Smart Switch
128
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Configuring Global and Bridge Settings
To configure STP global settings and bridge settings:
STEP 1
Specify the following global settings:
•
Spanning Tree State—Select to enable STP operation on the switch. You
must also enable STP operation on individual ports (see
must also enable STP operation on individual ports (see
).
•
STP Operation Mode—Select one of the following STP modes:
-
Classic STP—Operates according to the original IEEE 802.1D spanning
tree protocol.
tree protocol.
-
Rapid STP—Is the default value and provides faster spanning tree
convergence after a topology change than does classic STP.
convergence after a topology change than does classic STP.
-
Multiple STP—Supports multiple instances of STP to efficiently channel
VLAN traffic over different interfaces.
VLAN traffic over different interfaces.
•
BPDU Handling—Bridge Protocol Data Units (BPDUs) are the messages
exchanged between switches to calculate STP topology. Select the method
of BPDU packet handling when the spanning tree is disabled on an interface:
exchanged between switches to calculate STP topology. Select the method
of BPDU packet handling when the spanning tree is disabled on an interface:
-
Filtering—Enables the port to discard BPDUs received on interfaces that
are not enabled for STP.
are not enabled for STP.
-
Flooding—Allows flooding of BPDUs received on non-spanning-tree
ports to all other non-spanning-tree ports.
ports to all other non-spanning-tree ports.
STEP 2
Specify the following bridge setting:
•
Priority—The bridge priority value. When switches or bridges are running
STP, each is assigned a priority. After exchanging BPDUs, the switch with the
lowest bridge identifier becomes the root bridge. The bridge priority must
be a multiple of 4096. If you specify a priority that is not a multiple of 4096,
the priority is automatically set to the next lowest multiple of 4096. For
example if you attempt to set the priority to any value between 0 and 4095,
it will be set to 0. The default priority is 32768. The valid range is 0-61440.
STP, each is assigned a priority. After exchanging BPDUs, the switch with the
lowest bridge identifier becomes the root bridge. The bridge priority must
be a multiple of 4096. If you specify a priority that is not a multiple of 4096,
the priority is automatically set to the next lowest multiple of 4096. For
example if you attempt to set the priority to any value between 0 and 4095,
it will be set to 0. The default priority is 32768. The valid range is 0-61440.
•
Configuration Name—A name identifying the STP configuration that this
switch is currently using. By default, this value is set to the base MAC
address in hexadecimal notation. The configuration name is the MSTP region
name carried in the MSTP BPDUs.
switch is currently using. By default, this value is set to the base MAC
address in hexadecimal notation. The configuration name is the MSTP region
name carried in the MSTP BPDUs.
•
Configuration Revision Level—A user-defined numeric value that identifies
the STP configuration that this switch is currently using.
the STP configuration that this switch is currently using.