CHAPTER 12: SPANNING TREE PROTOCOL (STP) SPANNING TREE PROTOCOL (STP)
MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 12–7
The priority command specifies the port or switch level priority. When a port(s) are
specified the priority is associated with ports and their value is 0 to 255. If no ports are
specified, then the switch (bridge) priority is specified and its value is 0 to 65535. 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 default value is 32768.
priority [port=<number|list|range>]
value=<0-255 | 0-65535>
The
cost command is port specific. 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. Value ranges from 0 to 65535, with a default value of 32768.
cost port=<number|list|range>
value=<0-65535>
The
port command assigns ports to STP. If you are unsure, let the software make the
decisions. The status parameter enables or disables a port from participating in STP
discovery. Its best to only allow trunk ports to participate in STP. End stations need not
participate in STP process.
port port=<number|list|range>
status=<enable|disable>
The
timers command changes the STP forward delay, hello timer and aging timer values.
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 value of 15. When the switch is the root device, the
hello
parameter represents the time between messages being transmitted. The value is from 1
to 10 seconds with a default value is 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.
timers forward-delay=<4-30> hello=<1-10> age=<6-40>
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