Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Configuring Global Settings for STA
36
Parameters
These parameters are displayed:
Basic Configuration of Global Settings
•
Spanning Tree Status – Enables/disables STA on this switch. (Default: Enabled)
•
Spanning Tree Type – Specifies the type of spanning tree used on this switch:
•
STP: Spanning Tree Protocol (IEEE 802.1D); i.e., when this option is selected, the switch
will use RSTP set to STP forced compatibility mode).
•
RSTP: Rapid Spanning Tree (IEEE 802.1w); RSTP is the default.
•
MSTP: Multiple Spanning Tree (IEEE 802.1s)
•
Priority – Bridge priority is used in selecting the root device, root port, and designated port. The
device with the highest priority becomes the STA root device. However, if all devices have the
same priority, the device with the lowest MAC address will then become the root device. (Note
that lower numeric values indicate higher priority.)
•
Default: 32768
•
Range: 0-61440, in steps of 4096
•
Options: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, 61440
•
BPDU Flooding – Configures the system to flood BPDUs to all other ports on the switch or just
to all other ports in the same VLAN when spanning tree is disabled globally on the switch or
disabled on a specific port.
•
To VLAN: Floods BPDUs to all other ports within the receiving port’s native VLAN (i.e., as
determined by port’s PVID). This is the default.
•
To All: Floods BPDUs to all other ports on the switch.
The setting has no effect if BPDU flooding is disabled on a port (see
Advanced Configuration Settings
The following attributes are based on RSTP, but also apply to STP since the switch uses a
backwards-compatible subset of RSTP to implement STP, and also apply to MSTP which is based on
RSTP according to the standard:
•
Path Cost Method – The path cost is used to determine the best path between devices. The
path cost method is used to determine the range of values that can be assigned to each
interface.
•
Long: Specifies 32-bit based values that range from 1-200,000,000. (This is the default.)
•
Short: Specifies 16-bit based values that range from 1-65535.
•
Transmission Limit – The maximum transmission rate for BPDUs is specified by setting the
minimum interval between the transmission of consecutive protocol messages. (Range: 1-10;
Default: 3)
When the Switch Becomes Root
•
Hello Time – Interval (in seconds) at which the root device transmits a configuration message.
•
Default: 2
•
Minimum: 1
•
Maximum: The lower of 10 or [(Max. Message Age / 2) -1]