Siemens SCALANCE X-200RNA, Руководство по эксплуатации

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7.3 Assignment of an IP address
7.3.1 Introduction
Introduction
An IE switch provides a wide range of functions for settings and diagnostics. To access these
functions over the network, the Internet protocol is used.
The Internet protocol has its own address mechanism using IP addresses. As the protocol of
layer 3 of the ISO/OSI reference model, the IP protocol is independent of hardware allowing
flexible address assignment. In contrast to layer 2 communication (where the MAC address is
permanently assigned to a device), this makes it necessary to assign an address to a device
explicitly.
This section describes the structure of an IP address and the various options for assigning the
address with an IE switch.
Note
The initial assignment of an IP address for X-200 IE switches cannot be made with Web Based
Management because this configuration tool can only be used if an IP address already exists.
Address classes to RFC 1518 and RFC 1519
An IP address consists of 4 bytes. Each byte is represented in decimal, with a dot separating
it from the previous one. This results in the following structure, where XXX stands for a number
between 0 and 255:
XXX.XXX.XXX.XXX
The IP address is made up of two parts, the network ID and the host ID. This allows different
subnets to be created. Depending on the bytes of the IP address used as the network ID and
those used for the host ID, the IP address can be assigned to a specific address class.
IP address range Max. number of
networks
Max. number of
hosts/network
Class CIDR notation
1.x.x.x to 126.x.x.x 126 16777214 A /8
128.0.x.x to 191.255.x.x 16383 65534 B /16
192.0.0.x to 223.255.255.x 2097151 254 C /24
Multicast groups D
Reserved for experiments E
Subnet mask
The bits of the host ID can be used to create subnets. The leading bits represent the address
of the subnet and the remaining bits the address of the host in the subnet.
Functional description and configuration using Web Based Management
7.3 Assignment of an IP address
SCALANCE X-200RNA
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Operating Instructions, 10/2016, C79000-G8976-C342-04