Table 5: Recommended Sta Path Cost Range; Table 6: Recommended Sta Path Costs; Table 7: Default Sta Path Costs - Edge-Core ES4528V-38 Management Manual

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.)
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.

Table 5: Recommended STA Path Cost Range

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet

Table 6: Recommended STA Path Costs

Port Type Link Type
Ethernet Half Duplex
Full Duplex
Trunk
Fast Ethernet Half Duplex
Full Duplex
Trunk
Gigabit Ethernet Full Duplex
Trunk

Table 7: Default STA Path Costs

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
Priority – Defines the priority used for this port in the Spanning Tree
◆
Protocol. If the path cost for all ports on a switch are the same, the port
with the highest priority (i.e., lowest value) will be configured as an
active link in the Spanning Tree. This makes a port with higher priority
less likely to be blocked if the Spanning Tree Protocol is detecting
network loops. Where more than one port is assigned the highest
priority, the port with lowest numeric identifier will be enabled.
(Range: 0-240, in steps of 16; Default: 128)
– 79 –
C
HAPTER
Configuring the Spanning Tree Algorithm
IEEE 802.1D-1998
50-600
10-60
3-10
IEEE 802.1D-
1998
100
95
90
19
18
15
4
3
Link Type
Half Duplex
Full Duplex
Trunk
Half Duplex
Full Duplex
Trunk
Full Duplex
Trunk
| Configuring the Switch
4
IEEE 802.1w-2001
200,000-20,000,000
20,000-2,000,000
2,000-200,000
IEEE 802.1w-2001
2,000,000
1,999,999
1,000,000
200,000
100,000
50,000
10,000
5,000
IEEE 802.1w-2001
2,000,000
1,000,000
500,000
200,000
100,000
50,000
10,000
5,000