Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 467)

Multi-Service IronWare Switching Configuration Guide 437
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Configuring RSTP parameters
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Syntax: rstp [admin-edge-port] | [admin-pt2pt-mac]
The ethernet slot/portnum parameter specifies the interface used.
The path-cost value parameter specifies the cost of the port’s path to the root bridge. RSTP prefers
the path with the lowest cost. You can specify a value from 1 – 20,000,000.
Table 59 shows the
recommended path cost values from the IEEE standards.
The priority value parameter specifies the preference that RSTP gives to this port relative to other
ports for forwarding traffic out of the topology. You can specify a value from 0 – 240, in increments
of 16. If you enter a value that is not divisible by four, the software rounds to the nearest value that
is divisible by four. The default is 128. A higher numerical value means a lower priority; thus, the
highest priority is 8.
Set the admin-edge-port to enabled or disabled. If set to enabled, then the port becomes an edge
port in the domain.
Set the admin-pt2pt-mac to enabled or disabled. If set to enabled, then a port is connected to
another port through a point-to-point link. The point-to-point link increases the speed of
convergence. This parameter, however, does not auto-detect whether or not the link is a physical
point-to-point link.
The force-migration-check parameter forces the specified port to sent one RST BPDU. If only STP
BPDUs are received in response to the sent RST BPDU, then the port will go return to sending STP
BPDUs.
Syslogs for RSTP
By default, syslog messages for RSTP are enabled. To disable syslogs generated by a Topology
Change Notice (TCN) for RSTP, enter the following command.
Brocade(config)# no logging enable rstp tc-rx
Syntax: [no] logging enable rstp tc-rx
TABLE 59 Recommended path cost values of RSTP
Link speed Recommended (default) RSTP
path cost values Recommended RSTP path cost range
Less than 100 kilobits per
second 200,000,000 20,000,000 – 200,000,000
1 Megabit per second 20,000,000 2,000,000 – 200,000,000
10 Megabits per second 2,000,000 200,000 – 200,000,000
100 Megabits per second 200,000 20,000 – 200,000,000
1 Gigabit per second 20,000 2,000 – 200,000,000
10 Gigabits per second 2,000 200 – 20,000
100 Gigabits per second 200 20 – 2,000
1 Terabits per second 20 2 – 200
10 Terabits per second 2 1 – 20