1.1 Introduction to IP Addresses
IP is the core of the TCP/IP protocol suite. The packets of the Transmission Control Protocol
(TCP), User Datagram Protocol (UDP), Internet Control Message Protocol (ICMP), and Internet
Group Membership Protocol (IGMP) are all transmitted in the format of IP datagrams. Devices
on different networks communicate with each other using their network layer addresses, namely
IP addresses.
To communicate with each other on Internet Protocol (IP) networks, each host must be assigned
an IP address.
An IP address is a 32-bit number that is composed of two parts, namely, the network ID and
host ID.
The network ID identifies a network and the host ID identifies a host on the network. If the
network IDs of hosts are the same, it indicates that the hosts are on the same network regardless
of their physical locations.
1.2 Features of IP Addresses Supported by the S2700
IP addresses can be obtained through static manual configuration or DHCP.
The S2700 supports IP address configuration through the following methods:
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Manually configuring an IP address for an interface
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Obtaining an IP address by DHCP
The S2700 supports the space overlapping of network segment addresses to save the address
space.
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Different IP addresses in the overlapped network segments but not same can be configured
on different interfaces of the same device. For example, after an interface on a device is
configured with the IP address 20.1.1.1/16, if another interface is configured with the IP
address 20.1.1.2/24, the system prompts a message. However, the configuration is still
successful; if another interface is configured with the IP address 20.1.1.2/16, the system
prompts an IP address conflict. The configuration fails.
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The primary IP address and the secondary IP address in the overlapped network segments
but not same can be configured on the same interface. For example, after the interface is
configured with a primary IP address 20.1.1.1/24, if the secondary IP address is 20.1.1.2/16
sub, the system prompts a message. However, the configuration is still successful.
l
The primary IP address and the secondary IP address in the overlapped network segments
but not same can be configured on different interfaces of the same device. However, the
primary IP address and the secondary IP address cannot be the same. For example, after an
interface on a device is configured with the IP address 20.1.1.1/16, if another interface is
configured with the IP address 20.1.1.2/24 sub, the system prompts a message. However,
the configuration is still successful.
The S2700 supports 31-bit IP address masks. Therefore, there are only two IP addresses in a
network segment, that is, the network address and broadcast address. The two IP addresses can
be used as host addresses.
Quidway S2700 Series Ethernet Switches
Configuration Guide - IP Service
1 IP Addresses Configuration
Issue 01 (2011-07-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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