SMC Networks TigerAccess SMC7816M - Manual (Page 319)

C
ONFIGURING
I
NTERFACE
S
ETTINGS
12-19
loops. Where more than one port is assigned the highest priority, the
port with lowest numeric identifier will be enabled.
- Default: 128
- Range: 0-240, in steps of 16
• Admin Path Cost – This parameter is used by the STA to determine the
best path between devices. Therefore, lower values should be assigned
to ports attached to faster media, and higher values assigned to ports
with slower media. (Path cost takes precedence over port priority.)
(Range: 0 for auto-configuration, 1-65535 for the short path cost
method
16 , 1-200,000,000 for the long path cost method)
By default, the system automatically detects the speed and duplex mode
used on each port, and configures the path cost according to the values
shown below. Path cost “0” is used to indicate auto-configuration mode.
When the short path cost method is selected and the default path cost
recommended by the IEEE 8021w standard exceeds 65,535, the default
is set to 65,535.
16. Refer to “Configuring Global Settings” on page 12-8 for information on setting the path
cost method.
Table 12-1 Recommended STA Path Cost Range
Port Type IEEE 802.1D-1998 IEEE 802.1w-2001
Fast Ethernet 10-60 20,000-2,000,000
Gigabit Ethernet 3-10 2,000-200,000
Table 12-2 Recommended STA Path Costs
Port Type Link Type IEEE 802.1D-1998 IEEE 802.1w-2001 *
* Default path costs use the IEEE 802.1w-2001 recommendations,
except when short path cost method is selected and the recommended
value would fall below 65,535 (i.e., the minimum default setting).
Fast Ethernet Half Duplex
Full Duplex
Trunk 19
18
15 200,000
100,000
50,000
Gigabit Ethernet Full Duplex
Trunk
4
3 10,000
5,000