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Chapter 4: Operation of Web- based Management
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.
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 administrator 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 Num-
ber 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.
Admin Edge Port: If user selects "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 recei-
ves a BPDU.
Default: No
Admin Point To Point: say a port is a point-to-point link, from RSTP's
view, if it is in full-duplex mode but is 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 configure this parameter to be
LANCOM ES-2126+ and LANCOM ES-2126P+
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