Cisco SPS208G User Manual page 188

Spanning Tree
Global STP
SPS208G/SPS224G4/SPS2024 Service Provider Switches User Guide
-
Rapid STP
-
Multiple STP
•
BPDU Handling — Determines how Bridge Protocol Data Units (BPDU)
packets are managed when STP is disabled on the port or device. BPDUs
are used to transmit spanning tree information. The possible field values
are:
-
Filtering
— Filters BPDU packets when spanning tree is disabled on an
interface.
-
Flooding
— Floods BPDU packets when spanning tree is disabled on an
interface. This is the default value.
-
Bridging
— Indicates the both REP and STP BPDU packets are bridged
with all the VLAN rules and configurations.
•
Path Cost Default Values — Specifies the method used to assign default
path costs to STP ports. The possible field values are:
-
Short
— Specifies that the default path costs are per the short default
cost method. The possible range is 1 through 65535.
-
Long
— Specifies that the default path costs are per the long default
cost method. The possible range is 1 through 200,000,000. This is the
default value.
The Bridge Settings area contains the following fields:
•
Priority — Specifies the bridge priority value. When switches or bridges are
running STP, each is assigned a priority. After exchanging BPDUs, the
device with the lowest priority value becomes the Root Bridge. The bridge
priority value is provided in increments of 4096. For example, 4096, 8192,
12288, etc. The range is 0 to 65535. The default value is 32768.
The Hello Time, Max Age and Forward Delay fields are applicable to the Root
NOTE
Bridge and must be set individually. After each field is set, save the
configuration.
•
Hello Time — Specifies the device Hello Time. The Hello Time indicates the
amount of time in seconds a root bridge waits between configuration
messages. The range is 1 to 10 seconds. The default is 2 seconds.
— Enables Rapid STP on the device.
— Enables Multiple STP on the device.
10
188