Installation manual

3-162
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- 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
• Spanning Tree 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 “Configuring
Interface Settings” on page 3-168).
Root Device Configuration
• 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]
• Maximum Age – The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure. All device ports (except for
designated ports) should receive configuration messages at regular intervals. Any port
that ages out STA information (provided in the last configuration message) becomes the
designated port for the attached LAN. If it is a root port, a new root port is selected from
among the device ports attached to the network. (References to “ports” in this section
mean “interfaces,” which includes both ports and trunks.)
- Default: 20
- Minimum: The higher of 6 or [2 x (Hello Time + 1)].
- Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
• Forward Delay – The maximum time (in seconds) this device will wait before changing
states (i.e., discarding to learning to forwarding). This delay is required because every
device must receive information about topology changes before it starts to forward
frames. In addition, each port needs time to listen for conflicting information that would
make it return to a discarding state; otherwise, temporary data loops might result.
- Default: 15
- Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]