12–4 MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
SPANNING TREE PROTOCOL (STP) CHAPTER 12: SPANNING TREE PROTOCOL (STP)
• Root Bridge Forward Delay: Indicates the designated root bridge forward delay.
This is the time the switch waits before switching from the listening to the
forwarding state. The default is 15 seconds, with a range of 4 to 30 seconds.
• Root Bridge Hello Time: Indicates the designated root bridge's hello time. Hello
information is transmitted every 2 seconds.
• Root Bridge Max Age: Indicates the designated root bridge maximum age, after
which it discards the information as being old and receives new updates.
These variables can be changed using the “priority”, “cost”, “port” and “timers” commands
described later in this chapter.
Example 12-2 illustrates the
show stp command with the ports parameter. The variables
listed in this example are defined as follows:
•
Port#: indicates the port number. Value ranges from 01 to max number of ports in
the switch
Example 12-1: Viewing STP configuration
ML3000# show stp config
STP CONFIGURATION
-----------------
Spanning Tree Enabled(Global) : NO
Spanning Tree Enabled(Ports) : YES, 9,10,11,12,13,14,15,16
Protocol : Normal STP
Bridge ID : 80:00:00:20:06:25:ed:80
Bridge Priority : 32768
Bridge Forward Delay : 15
Bridge Hello Time : 2
Bridge Max Age : 20
Root Port : 0
Root Path Cost : 0
Designated Root : 80:00:00:20:06:25:ed:80
Designated Root Priority : 32768
Root Bridge Forward Delay : 15
Root Bridge Hello Time : 2
Root Bridge Max Age : 20
RSTP CONFIGURATION
-----------------
Example 12-2: Viewing STP ports
ML3000# show stp ports
STP Port Configuration
--------------------------------------------------------------------------------------
Port# Type Priority Path Cost State Des. Bridge Des. Port
--------------------------------------------------------------------------------------
09 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:09
10 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0a
11 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0b
12 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0c
13 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0d
14 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0e
15 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:0f
16 TP(10/100) 128 100 Disabled 80:00:00:20:06:25:ed:80 80:10