GE MULTILINK ML2400 Instruction Manual page 205

CHAPTER 13: RAPID SPANNING TREE PROTOCOL
Example 13-2: Reviewing the RSTP port parameters
ML2400(rstp)##
RSTP Port Configuration
--------------------------------------------------------------------------------------
Port# Type
--------------------------------------------------------------------------------------
09 TP(10/100)
10 TP(10/100)
11 TP(10/100)
12 TP(10/100)
13 TP(10/100)
14 TP(10/100)
15 TP(10/100)
16 TP(10/100)
ML2400(rstp)##
MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
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: This is the assigned port cost value used for the switch to determine the
forwarding points. Values range from 1 to 2000000. Lower values indicate a lower
cost and hence the preferred route. The costs for different Ethernet speeds are
indicated below. The Path cost in STP is compared to the path cost in RSTP.
Table 13–1: Path cost as defined in IEEE 802.1d /
802.1w
Port type STP path cost
10 Mbps 100
100 Mbps 19
1 Gbps 4
10 Gbps 2
• State: Indicates the STP state of individual ports. Values can be Listening, Learning,
Forwarding, Blocking and Disabled.
• Des. Bridge: This is the port's designated root bridge
• Des. Port: This is the port's designated root port
show stp ports
Priority Path Cost
128 2000000
128 2000000
128 2000000
128 2000000
20 200000
128 2000000
128 2000000
128 2000000
Another example of the same command, from a larger network with several switches is
shown in Example 13-3. Note the
manager level prompt or from RSTP configuration state as shown in the screen captures
earlier.
command are:
show stp ports
RSTP path cost
2000000
200000
20000
2000
State Des. Bridge
Forwarding 80:00:00:20:06:25:ed:89
Disabled
Disabled
Disabled
Forwarding 80:00:00:20:06:25:ed:89
Disabled
Disabled
Disabled
show stp ports
RAPID SPANNING TREE PROTOCOL
Des. Port
80:09
80:0a
80:0b
80:0c
80:0d
80:0e
80:0f
80:10
command can be executed from the
13–7