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Configured Path Cost:
The range is 0 – 200,000,000. If the path cost is set to 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, the value set by the administrator set up will be displayed.
802.1w RSTP recommended value: (Valid range: 1 – 200,000,000)
Priority:
Port Priority and Port Number are combined 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.
Admin Edge Port:
If you select Yes, this port will be an edge port. An Edge Port is a port connected to a device
that knows nothing about STP or RSTP. Usually, the connected device is an end station. Edge
Ports will immediately transit to forwarding state and skip the listening and learning state
because the edge ports cannot create bridging loops in the network. This will expedite the
convergence. When the link on the edge port toggles, the STP topology keeps unchanged.
Unlike the designate port or root port though, an edge port will transit to a normal spanning-tree
port immediately if it receives a BPDU.
Default: No
Admin Point To Point:
A port is a point-to-point link, from RSTP's view, if it is in full-duplex mode. It is a shared link if it
is in half-duplex mode. RSTP fast convergence can only happen on point-to-point links and on
edge ports. This can expedite the convergence because this will have the port fast transited to
forwarding state.
There are three parameters, Auto, True and False, used to configure the type of the point-to-
point link. If the parameter is configured to Auto, RSTP will use the duplex mode resulting from
the auto-negotiation. If it goes into half-duplex, the port will not transit to Forwarding state. If it
is set as True, the port is treated as point-to-point link by RSTP and unconditionally transited to
Forwarding state. If it is set to False, fast transition to Forwarding state will not occur on this port.
Default: Auto
M Check:
Migration Check. Forces the port sending out an RSTP BPDU instead of a legacy STP BPDU at
the next transmission. The only benefit of this operation is to make the port quickly get back to
act as an RSTP port. Select M Check to send a RSTP BPDU from the port you specified.
Waters Network Systems
10 Mbps : 2,000,000
100 Mbps : 200,000
1 Gbps
: 20,000
Default: 0
User's Manual
GSM-2108/GSM-1008SFP
Page 77
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