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LANCOM GS-2124
Chapter 4: Operation of Web- based Management
134
Parameter:
Port Status:
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.
Notice: 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 lear-
ning knowledge but cannot forward packets still.
"Forwarding state" indicates this port can both contribute its lear-
ning knowledge and forward packets normally.
Path Cost Status:
It is the contribution value of the path through this port to Root
Bridge. STP algorithm determines a best path to Root Bridge by cal-
culating 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.
Configured Path Cost:
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 admi-
nistrator set up in Configured Path Cost and Path Cost Status.
802.1w RSTP recommended value: (Valid range: 1 – 200.000.000)
10 Mbps : 2.000.000
100 Mbps : 200.000
1 Gbps
: 20.000
Default
: 0
Priority:
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
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