Siemens SCALANCE X-300 Configuration Manual page 134

Configuration using Web Based Management and Command Line Interface
4.5 The Switch menu
Aging Time [sec]
Enter the time after which the IE switch deletes an address if it has not received frames with
the corresponding sender address.
On the SCALANCE X408-2, the default for the aging time is 30 s. You can set the aging time
in the range from 15 to 3825 seconds in 15 s steps.
On the SCALANCE X414-3E, the default for the aging time is 40 s. You can set the aging
time in the range from 10 to 1000000 seconds as required.
Mirroring Enabled
Mirroring means that the data traffic of a port (mirrored port) of the IE switch is copied to
another port (monitor port).
If you select Mirroring Enabled, you can mirror one or more ports to a monitor port.
Passive Listening
if you enable Passive Listening, the IE switch also reacts to a reconfiguration without being
in (R)STP mode. When an RSTP Topology Change frame is received, the MAC address
table is deleted. Spanning tree BPDUs are also forwarded.
Note
In passive listening mode, the IE switch is not compatible with IEEE 802.1d that forbids
forwarding of spanning tree BPDUs when not in (R)STP mode.
Note
If the (R)STP function is activated on a switch that is a node in a redundant ring, no spanning
tree BPDUs are forwarded via the ring ports. This also applies if the passive listening
function is enabled.
In this case, there must be no (R)STP network segments linked via the redundant ring
otherwise this would lead to the formation of loops.
Oversize Mode
If you enable Oversize Mode, frames with a size up to 1,632 bytes instead of 1,522 bytes are
permitted.
Note
Overlong frames in PRP networks
If you use a SCALANCE X-300 or X-400 IE switch in a PRP network, enable the "Oversize
Mode" option.
In a PRP network, overlong frames with a length of up to 1528 bytes can occur. If you enable
the "Oversize Mode" option, overlong frames are forwarded.
134
Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400