Options for the VLAN assignment
There are various options for the assignment to VLANs:
● Port-based VLAN
Each port of a device is assigned a VLAN ID. You configure port-based VLAN in "Layer 2 >
VLAN (Page 261)".
● Protocol-based VLAN
Each port of a device is assigned a protocol group.
● Subnet-based VLAN
The IP address of the device is assigned a VLAN ID.
Doubly tagged frame (Q-in-Q)
There are devices e.g. SCALANCE XR500 that support the Q-in-Q function. With the Q-in-Q
function the incoming data traffic is treated as if it were untagged. With frames that are already
tagged ①, this means they are expanded by a second VLAN tag, the outer VLAN tag ②.
When a SCALANCE W device receives a doubly tagged frame, it uses the VLAN ID from the
outer VLAN tag ② and the priority information from the inner VLAN tag ①. The frame is then
forwarded to the relevant VLAN.
4.6 SNMP
Introduction
With the aid of the Simple Network Management Protocol (SNMP), you monitor and control
network components from a central station, for example routers or switches. SNMP controls the
communication between the monitored devices and the monitoring station.
Tasks of SNMP:
● Monitoring of network components
● Remote control and remote parameter assignment of network components
● Error detection and error notification
In versions v1 and v2c, SNMP has no security mechanisms. Each user in the network can
access data and also change parameter assignments using suitable software.
For the simple control of access rights without security aspects, community strings are used.
The community string is transferred along with the query. If the community string is correct, the
SNMP agent responds and sends the requested data. If the community string is not correct, the
SNMP agent discards the query. Define different community strings for read and write
permissions. The community strings are transferred in plain text.
Technical basics
4.6 SNMP
SCALANCE W1780/W1740 according to IEEE 802.11ac Web Based Management
38 Configuration Manual, 11/2019, C79000-G8976-C485-03
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