SWT
GIGABIT/FAST ETHERNET SWITCH TYPE SWT 68/137
USER GUIDE - M0SWTA1903Iv09 - V09 March 2019
The configuration parameters for each port are:
• Enable. Establishes whether the STP protocol configured in the interface is
executed or not. Only makes sense if the Enable CheckBox corresponding to
general execution is active.
• Priority. This establishes the port priority. If there are two or more ports with one
cost, the priority allows the root port of the equipment to be selected.
• Cost. This establishes the cost associated with the port. Selecting the root port of
the equipment is directly related to the lower cost of the different ports in relation to
the root equipment.
• Edge. This parameter sets the administrative mode of the interface with respect to
the STP. Interfaces connected to client devices, i.e., devices that are not level 2
switching units and which therefore do not execute STP or give rise to the creation
of loops may be booted directly to a traffic transmission situation (on mode).
Interfaces that are directly connected to level 2 switching devices and are therefore
prone to close loops must be booted in the accept user traffic mode (off mode).
A third mode exists, auto, in which the equipment determines the presence or
absence of level 2 switching devices connected to the interface. This is useful in
cases in which the type of devices to be connected is not known.
The last and fourth mode, redundant, is specifically designed for pairs of switches
with multiple links due to chains of multi-homed client devices. The redundant
mode allows the connection of client devices with more than one network interface
in use connected to different switches and are transparent to STP, so that the
interconnected switches can identify each other while giving access to the client
devices. The redundant ports act as redundant links for access to client devices,
but not as redundant links in terms of network topology. See an example of the
redundant mode in FIGURE 37.
Even when the Edge parameter is on, the switch maintains activated the detection
of other switch connection to the interface, so operating state can become off.
The operation mode of the interface, on or off, is shown in the STP statistics section.
• PtP. The PtP parameter establishes whether the interface is directly connected to
other level 2 switching equipment on an end-to-end link (on value) or not (off
value) but the equipment is also capable of detecting that situation (auto value). If
the equipment indicates that a link is PtP, this allows greater speed in protocol
convergence, and the agreement process on changing the state of a link from
designated to non-discarding (operative for user traffic) is speeded up.
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