Sunfire B1600 manual Configuring Interface Settings for STA

TABLE 3-38MIB Variables Associated With a Port’s STA Settings (Continued)

				Default
Field Name	MIB Variable	Access	Value Range	Value
STA Port Enable	sun...mstMgt.	Read/write	enabled (1),	enabled
(Admin status)	mstInstancePortTable.		disabled (2)
	mstInstancePortEntry.
	mstInstancePortEnable
STA Port Role	sun...mstMgt.	Read only	disabled (1),
	mstInstancePortTable.		root (2),
	mstInstancePortEntry.		designated (3),
	mstInstancePortPortRole		alternate (4),
			backup (5)
STA Port	sun...mstMgt.	Read only	Octet string
Designated Root	mstInstancePortTable.
	mstInstancePortEntry.
	mstInstancePort-
	DesignatedRoot
STA Port	sun...mstMgt.	Read only	Counter
Forward	mstInstancePortTable.
Transitions	mstInstancePortEntry.
	mstInstancePort-
	ForwardTransitions

3.4.6.2Configuring Interface Settings for STA

These settings apply to the selected interface(s) when the switch is set to STP forced compatibility mode (page 3-70) and RSTP.

When configuring STA interface settings through the web interface or CLI, the following parameters can be configured:

■Priority – The priority (between 0 and 240 in steps of 16) used for the port in the Spanning Tree Algorithm (STA). If the path cost for all ports on a switch is the same, the port with the highest priority (lowest value) is configured as an active link in the Spanning Tree. This makes a port with higher priority less likely to be blocked if the STA is detecting network loops. Where more than one port is assigned the highest priority, the port with lowest numeric identifier is enabled. The default is 128.

■Path Cost – This parameter is used by the STA to determine the best path between devices. Therefore, assign lower values to ports connected to faster media and higher values to ports connected to slower media. (Path cost takes precedence over port priority.)

■The range of values for Ethernet connections is between 200,000 and 20,000,000, for Fast Ethernet 20,000 to 2,000,000, and Gigabit Ethernet 2000 to 200,000.

Chapter 3 General Management of the Switch 3-129