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12-Port 1000BASE-TX L2 Managed PoE Switch with 2 SFP Dual Media Ports
Parameter
Port Status
Path Cost Status
Configured Path Cost
Priority
72
Table 4- 38. STP Port setting screen options.
Description
It displays the current state of a port. We cannot manually set it
because it displays the status only. There are three possible
states. ( according to 802.1w specification).
DISCARDING state indicates that this port can neither forward
packets nor contribute learning knowledge.
Three other states (Disable state, BLOCKING state and
LISTENING state) defined in the 802.1d specification are now all
represented as DISCARDING state.
LEARNING state indicates this port can now contribute its
learning knowledge but cannot forward packets still.
FORWARDING state indicates this port can both contribute its
learning knowledge and forward packets normally.
It is the contribution value of the path through this port to Root
Bridge. STP algorithm determines a best path to Root Bridge by
calculating the sum of path cost contributed by all ports on this
path. A port with a smaller path cost value would become the Root
Port more possibly.
The range is 0 – 200,000,000. In the switch, if path cost is set to be
zero, the STP will get the recommended value resulted from
auto-negotiation of the link accordingly and display this value in the
field of Path Cost Status. Otherwise, it may show the value that the
administrator set up in Configured Path Cost and Path Cost Status.
802.1w RSTP recommended value: (Valid range: 1 – 200,000,000)
10 Mbps
100 Mbps
1 Gbps
Default: 0
Priority here means Port Priority. Port Priority and Port Number are
mixed to form the Port ID. Port IDs are often compared in order to
determine which port of a bridge would become the Root Port. The
range is 0 – 240.
Default is 128.
Note
: 2,000,000
: 200,000
: 20,000
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