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13–8 MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL
RAPID SPANNING TREE PROTOCOL CHAPTER 13: RAPID SPANNING TREE PROTOCOL
The show-timers command displays the values of the timers set for RSTP.
show-timers
The
priority command specifies the switch (bridge) priority value. This value is used
along with the switch MAC address to determine which switch in the network is the root
device. Lower values mean higher priority. The value ranges from 0 to 65535 with a default
of 32768. When port are specified, the priority is associated with ports and their value is 0
to 255.
priority [port=<number|list|range>]
value=<0-255|0-65535>
A path cost is assigned to individual ports for the switch to determine which ports are the
forwarding points. A higher cost means the link is “more expensive” to use and falls in the
passive mode compared to the link with a lower cost. The value of the
cost command
ranges from 0 to 65535, with a default of 32768.
cost port=<number|list|range>
value=<0-65535>
The
port command assigns ports for RSTP. Note that specific ports may not need to
participate in RSTP process. These ports typically would be end-stations. If unsure, it is best
to let the software make the decisions.
port port=<number|list|range> status=<enable|disable>
The
status parameter enables or disables a port from participating in RSTP discovery. Its
best to only allow trunk ports to participate in RSTP; end stations need not participate in
the RSTP process.
The
timers command changes the STP forward delay, hello timer and aging timer values.
timers forward-delay=<4-30> hello=<1-10> age=<6-40>
The
forward-delay parameter indicates the time duration the switch will wait from
listening to learning states and from learning to forwarding states. The value ranges from
4 to 30 seconds with a default of 15.
The
hello parameter represents the time between messages being transmitted when the
switch is the root device. The value is 1 to 10 seconds, with a default of 2.
The
age parameter is the maximum time a message with STP information is allowed by the
switch before the switch discards the information and updates the address table again.
Value ranges from 6 to 40 seconds with default value of 20.