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13–8 MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
RAPID SPANNING TREE PROTOCOL CHAPTER 13: RAPID SPANNING TREE PROTOCOL
In this example, ports 9 and 10 have a path cost of 20000 and are the least cost paths.
These ports are connected to other switches and the ports are enabled as forwarding
ports. Ports 6 and 7 are also connected to other switches. From the state column, it
indicates that port 7 is in a standby state as that port is discarding all traffic.
More CLI commands associated with RSTP in the RSTP configuration mode are shown
below. The
forceversion command sets the STP or RSTP compatibility mode.
forceversion <stp|rstp>
The
show-forceversion command displays the current forced version.
show-forceversion
The
show-timers command displays the values of the timers set for RSTP.
show-timers
The
priority command 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. The value ranges from 0 to 65535 with a default
of 32768. When port are specified, the priority is associated with ports and their value is 0
to 255.
priority [port=<number|list|range>]
value=<0-255|0-65535>
A path cost is assigned to individual ports for the switch to determine which ports are the
forwarding points. A higher cost means the link is “more expensive” to use and falls in the
passive mode compared to the link with a lower cost. The value of the
cost command
ranges from 0 to 65535, with a default of 32768.
cost port=<number|list|range>
value=<0-65535>
The
port command assigns ports for RSTP. Note that specific ports may not need to
participate in RSTP process. These ports typically would be end-stations. If unsure, it is best
to let the software make the decisions.
port port=<number|list|range> status=<enable|disable>
Example 13-3: RSTP information from a network with multiple switches
ML2400(rstp)##
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) 20 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 Disacrding 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
ML2400(rstp)##