Specifications

8-156 set mstp msti port Rapier Switch Software Reference
Software Release 2.7.3
C613-03098-00 REV A
The pathcost parameter sets the internal path cost for the each port. This
parameter specifies a port’s contribution to the cost of a path to the MSTI
regional root via that port. It applies when the port is a root port. The pathcost
for a LAN port should be set in the range of 1 to 200000000. The default
pathcost values and the range of recommended pathcost values depend on the
port speed.
If the pathcost of a port has not been explicitly set by the user, or the default
values have been restored to the port, then the default pathcost for the port will
vary as the speed of the port varies. However, deleting an existing pathcost
value will not reapply the "no value" condition. To reapply the "no value"
condition, enter the word "default".
Example To set port priority of 120 for port 2 in MSTI5, use the command:
set mstp msti=5 port=2 priority=120
Table 8-28: Rounding scheme for ranges of port priority parameter values .
Lower Boundary Upper Boundary Rounded Port Priority
Value
0 0
16
32
48
64
80
96
128
144
160
176
192
208
224
240
15
31
47
63
79
95
127
143
159
175
191
207
223
239
254
0
16
32
48
64
80
96
128
144
160
176
192
208
224
240
Table 8-29: Path cost values and port speed
Port Speed Default pathcost Recommended pathcost range
Less than 100 Kb/s
1Mbps
10Mbps
100 Mbps
1 Gbps
10 Gbps
100 Gbps
1Tbps
10 Tbps
200,000,000
20,000,000
2,000,000
200,000
20,000
2,000
200
20
2
20,000,000-200,000,000
2,000,000-20,000,000
200,000-2,000,000
20,000-200,000
2,000-20,000
200-2, 000
20-200
2-200
2-20