SW3-L3
GIGABIT/FAST ETHERNET SWITCH/ROUTER TYPE SW3-L3
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USER GUIDE - M0SW3M1902Iv07 - V06 February 2019
The configuration parameters for each port are:
•
Enable.
It sets 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 sets 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 sets 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 51.
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 sets 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.
