Dell PowerConnect 3248 Manual page 27

– 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.
• 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 becomes 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
• 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]
• 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 means "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)]
Addendum to the 3 248 and 52 24 User 's Guides
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