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CHAPTER 13: RAPID SPANNING TREE PROTOCOL RAPID SPANNING TREE PROTOCOL
MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL 13–5
The variables listed by the show stp config command are:
• Rapid Spanning Tree Enabled (Global): Indicates whether STP is enabled or disabled
globally i.e. if the values is YES, all ports have STP enabled, otherwise, all ports have
STP disabled.
• Rapid Spanning Tree Enabled Ports: Indicates which ports have RSTP enabled.
• Protocol: Indicates whether STP or RSTP is being used. It also indicates if RSTP is used
in Smart RSTP (ring-only mode) or normal mode.
• Bridge Priority: 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. Values range from 0 to 65535 with a
default of 0.
• Bridge Forward Delay: 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.
• Bridge Hello Time: When the switch is the root device, this is the time between
messages being transmitted. The value is from 1 to 10 seconds with a default of 2.
Example 13-1: Enabling RSTP and reviewing the RSTP variables
ML1200#rstp
ML1200(rstp)##
show stp config
RSTP CONFIGURATION
-----------------
Rapid STP/STP Enabled(Global) : NO
RSTP/STP Enabled Ports : 1,2,3,4,5,6,7
Protocol : Normal RSTP
Bridge ID : 80:00:00:20:06:2b:e1:55
Bridge Priority : 32768
Bridge Forward Delay : 15
Bridge Hello Time : 02
Bridge Max Age : 20
Root Port : 0
Root Path Cost : 0
Designated Root : 80:00:00:20:06:2b:e1:55
Designated Root Priority : 32768
Root Bridge Forward Delay : 15
Root Bridge Hello Time : 02
Root Bridge Max Age : 20
Topology Change count : 0
Time Since topology Chg : 16