SMC Networks 8028L2, Management Manual

Page: 253 / 392

C
HAPTER
15
| RSTP Commands
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rstp age
This command displays or sets RSTP maximum age.
S
YNTAX
rstp age [ maximum-age ]
maximum-age - The maximum time a device can wait without
receiving a configuration message before attempting to reconfigure.
(Range: 6-40 seconds)
Minimum: The higher of 6 or [2 x (Hello Time + 1)]
Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
D
EFAULT
S
ETTING
20 seconds
C
OMMAND
U
SAGE
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. (Note that references to
“ports” in this section mean “interfaces,” which includes both ports and
trunks.)
E
XAMPLE
RSTP>age 28
RSTP>
rstp delay
This command displays or sets RSTP forward delay.
S
YNTAX
rstp delay [ forward-delay ]
forward-delay - The maximum time this device will wait before
changing states (i.e., discarding to learning to forwarding).
(Range: 4-30 seconds)
Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
Maximum: 30
D
EFAULT
S
ETTING
15
C
OMMAND
U
SAGE
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.