M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
Port Type
STP Path cost
RSTP Path cost
10 Mbps
100
2,000,000
100 Mbps
19
200,000
1 Gbps
4
20,000
10 Gbps
2
2,000
Figure 81
– Path cost as defined in IEEE 802.1d (STP) and 802.1w (RSTP)
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
Another screen capture of the same command, from a larger network with several switches is
shown below.
Magnum6K25#
show stp ports
RSTP Port Configuration
--------------------------------------------------------------------------------------------------------------------------
Port# Type Priority Path Cost State
Des. Bridge
Des. Port
--------------------------------------------------------------------------------------------------------------------------
01 TP(10/100) 128 2000000
Disabled
00:01
02
TP(10/100) 128 2000000
Disabled
00:02
03
TP(10/100) 128 2000000
Disabled
00:03
04
TP(10/100) 128 2000000
Disabled
00:04
05
TP(10/100) 128 2000000
Disabled
00:05
06
TP(10/100) 128 200000
Forwarding 80:00:00:20:06:30:00:01 00:06
07
TP(10/100) 128 200000
Discarding
80:00:00:20:06:2b:0f:e1
00:07
08
TP(10/100) 128 2000000
Disabled
00:08
09 Gigabit
128 20000
Forwarding
80:00:00:20:06:2b:0f:e1
00:09
10 Gigabit
128 20000
Forwarding
80:00:00:20:06:30:00:01
00:0a
Magnum6K25#
F
IGURE
82
– RSTP information from a network with multiple switches. Note the “show stp ports” command
can be executed from the manager level prompt or from rstp configuration state as shown in the screen captures
earlier.
In this example, ports 9,10 have a path cost of 20,000 and are the least cost paths. These ports are
connected to other switches and the ports are enabled as forwarding ports. Ports 6, 7 are also
141