Dell PowerConnect 5212 Specifications download pdf (Page 48)

Bridge Settings

The Bridge Settings page contains the following information:

l Bridge ID — Identifies a unique identifier for the switch in the Spanning Tree. The ID is calculated using the defined Spanning Tree priority of the switch

and its MAC address. The lower the Bridge ID, the more likely the switch will act as the root.

l Max Age — The maximum time (in seconds) the switch 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. If the root port ages out STP information (provided in the

last configuration message), a new root port is selected from among the device ports attached to the network. (References to "ports" in this section

means "interfaces," which includes both ports and trunks.)

l Hello Time — Specifies the time interval (in seconds) at which the root device transmits a configuration message.

l Forward Delay — The maximum time (in seconds) the switch 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.

l Designated Root — Identifies the priority and MAC address of the device in the Spanning Tree that the switch has accepted as the root device.

l Root Port — Specifies the port number on the switch that is closest to the root. The switch communicates with the root device through this port. If

there is no root port, the switch has been accepted as the root device of the Spanning Tree network.

l Root Path Cost — Identifies the path cost from the root port on the switch to the root device.

l Configuration Changes — Specifies the number of times the Spanning Tree has been reconfigured.

l Last Topology Change — Identifies the time since the Spanning Tree was last reconfigured.

From the Bridge Settings page, under Attributes, you can configure the following Spanning Tree parameters:

l Spanning Tree State — Enables or disables the Spanning Tree. If you enable the Spanning Tree, you must complete the other fields. (Default: enabled)

l Spanning Tree Type — Specifies the type of STP used on the switch: (Default: RSTP)

¡ STP: Spanning Tree Protocol (IEEE 802.1D)

STP creates one Spanning Tree instance for the entire network. If multiple VLANs are implemented on a network, the path between specific VLAN

members may be inadvertently disabled to prevent network loops, thus isolating group members.



¡ RSTP: Rapid Spanning Tree Protocol (IEEE 802.1w)

RSTP supports connections to either STP or RSTP nodes by monitoring the incoming protocol messages and dynamically adjusting the type of

protocol messages the RSTP node transmits, as described below:

¡ STP Mode – If the switch receives an 802.1D Bridge Protocol Data Units (BPDU) (i.e., STP BPDU) after a port's migration delay timer expires, the

switch assumes it is connected to an 802.1D bridge and starts using only 802.1D BPDUs.

¡ RSTP Mode – If RSTP is using 802.1D BPDUs on a port and receives an RSTP BPDU after the migration delay expires, RSTP restarts the migration

delay timer and begins using RSTP BPDUs on that port.

l Priority — Bridge priority is used in selecting the root device, root port, and designated port. The device with the highest priority becomes the STP root

device. However, if all devices have the same priority, the device with the lowest MAC address will then become the root device.

¡ 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

l Hello Time — Interval (in seconds) at which the switch transmits a configuration message.

¡ Default: 2

¡ Minimum: 1

¡ Maximum: The lower of 10 or [(Max. Message Age / 2) -1]

l Maximum Age — The maximum time (in seconds) the switch 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 STP 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)]

l Forward Delay — The maximum time (in seconds) the switch 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]

¡ Maximum: 30

To save any changes you make in this page, click Apply Changes. If you don't want to save the changes, click Refresh.



NOTICE: When the STP option is selected, the switch will use RSTP set to STP forced- compatibility mode.

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Dell PowerConnect 5212 Specifications Page 48

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