Supermicro SSE-G2252 User Manual page 220

SSE-G2252/SSE-G2252P Switches User's Manual
• 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. Note that path
cost takes precedence over port priority. (Range: 0 for auto-configuration, 1-65535
for the short 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.
Table 9-1. Recommended STA Path Cost Range
Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
• Admin Link Type – The link type attached to this interface.
• Point-to-Point – A connection to exactly one other bridge.
• Shared – A connection to two or more bridges.
• Auto – The switch automatically determines if the interface is attached to a
point-to-point link or to shared media. (This is the default setting.)
• Root Guard – STA allows a bridge with a lower bridge identifier (or same identifier
and lower MAC address) to take over as the root bridge at any time. Root Guard can
be used to ensure that the root bridge is not formed at a suboptimal location. Root
Guard should be enabled on any designated port connected to low-speed bridges
which could potentially overload a slower link by taking over as the root port and
forming a new spanning tree topology. It could also be used to form a border around
part of the network where the root bridge is allowed. (Default: Disabled)
3. Refer to Section 9-3: "Configuring Global Settings for STA" on page 9-5
information on setting the path cost method.
3
, 1-200,000,000 for the long path cost method)
IEEE 802.1D-1998
50-600
10-60
3-10
Table 9-2. Default STA Path Costs
Short Path Cost
(IEEE 802.1D-1998)
65,535
65,535
10,000
IEEE 802.1w-2001
200,000-20,000,000
20,000-2,000,000
2,000-200,000
Long Path Cost
(802.1D-2004)
1,000,000
100,000
10,000
9-14
for