Network management for industrial networks
2.2 Functionality and properties of a SCALANCE X-300/X-400
SCALANCE X-300 / X-400
Configuration Manual, 10/2014, C79000-G8976-C187-22
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Fast redundancy in the ring
As of firmware version V3.0.0, the IE switches can handle the following redundancy
procedures:
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MRP in the ring with a maximum reconfiguration time of 200 ms
●
HRP with a maximum reconfiguration time of 300 ms
Redundant coupling of network segments
Rings or linear bus structures made up of IE switches (SCALANCE X-200 or X-300/X-400 or
OSM/ESM) can be linked redundantly with suitable cabling and appropriate configuration.
(See also section "X-400 Standby Mask menu item".)
The maximum failover time is 300 ms.
For more detailed information on redundant coupling of network segments and media
redundancy in ring topologies, refer to the operating instructions "Industrial Ethernet
Switches SCALANCE X-400" or "Industrial Ethernet Switches SCALANCE X-300".
Store and Forward
An IE switch calculates the CRC sum of incoming data packets and only forwards data with
a valid checksum (store and forward). Bad packets are not forwarded by the switch. Store
and forward also allows operation in a network on different links with different transmission
rates.
Support of virtual networks (VLAN port-based)
There is no physical difference between a virtual network (VLAN) and a normal LAN. The
particular feature of a VLAN is that devices can be assigned to a device group during
configuration. Several of these device groups use a network infrastructure that exists only
once physically. Several "virtual networks" result on the one physical network. Data
exchange and even the transmission of broadcasts takes place only within a VLAN.
The assignment to VLANs is achieved by expanding the frames. Four bytes of additional
information are inserted after the destination and source address. For more detailed
information on frame tagging, refer to Appendix C.
To be able to integrate end devices and subnets that do not support VLAN in virtual
networks, switches can also handle the addition and removal of the VLAN additional
information (VLAN tags). IE switches support assignment based on the port over which the
devices are connected (port-based VLAN).
●
X-400
Up to 62 port-based VLANs and the two predefined VLANs can be configured. VLANs
correspond to the IEEE 802.1Q standard.
●
X-300
Up to 253 port-based VLANs and the two predefined VLANs can be configured. VLANs
correspond to the IEEE 802.1Q standard.