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RAPID SPANNING TREE PROTOCOL
Example 13-2: Reviewing the RSTP port parameters
show stp ports
ML1200(rstp)##
RSTP Port Configuration
-------------------------------------------------------------------------------
Port#
Type
Priority
-------------------------------------------------------------------------------
01
TP(10/100)
02
TP(10/100)
03
100MB Fiber
04
100MB Fiber
13–6
•
Bridge Max Age: This 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. Values range from 6 to 40 seconds with a default value of 20.
•
Root Port: Indicates the port number, which is elected as the root port of the switch. A
root port of "0" indicates STP is disabled.
•
Root Path Cost: A path cost is assigned to individual ports for the switch to determine
which ports are the forwarding points. A higher cost means more loops; a lower cost
means fewer loops. More loops equal more traffic and a tree which takes a long time
to converge, resulting in a slower system.
•
Designated Root: Shows the MAC address of the bridge in the network elected or
designated as the root bridge.
•
Designated Root Priority: Shows the designated root bridge's priority. The default
value is 0.
•
Root Bridge Forward Delay: Indicates the designated root bridge's forward delay.
This is the time the switch waits before it switches from the listening to the forwarding
state. This value can be set between 4 to 30 seconds, with a default of 15.
•
Root Bridge Hello Time: Indicates the designated root bridge's hello time. Hello
information is sent out every 2 seconds.
•
Root Bridge Max Age: Indicates the designated root bridge's maximum age, after
which it discards the information as being old and receives new updates.
•
Topology Change Count: Since the last reboot, the number of times the topology has
changed. Use this in conjunction with "show uptime" to find the frequency of the
topology changes.
•
Time Since topology Change: The number of seconds since the last topology change.
The variables listed by the
•
Port#: Indicates the port number. The value ranges from 1 to the maximum number of
ports in the switch.
•
Type: Indicates the type of port. TP indicates twisted pair.
•
Priority: STP uses this to determine which ports are used for forwarding. Lower
numbers indicate higher priority. The values range from 0 to 255, with a default of 128.
Path Cost
State
128
2000000
Disabled
128
2000000
Disabled
128
200000
Disabled
128
200000
Disabled
CHAPTER 13: RAPID SPANNING TREE PROTOCOL
command are:
show stp ports
Des. Bridge
MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL
Des. Port
00:01
00:02
00:03
00:04
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