Dhcpv4 - Zte ZXR10 5900E Product Description

ZXR10 5900E Product Description
The source equipment broadcasts ARP requests with destination device's IP address,
and all devices in the network will receive this ARP request. If one device realizes that
the request is based upon its own IP address, it will then record sender's ARP
information and send ARP response containing its MAC address to source device. In this
way, the source device gets the MAC address of the destination device via this ARP
response.
In order to reduce ARP packet in the network and accelerate data delivery, IP address
and MAC address mapping is cached in the local ARP table. When equipment is going to
send data, it will firstly check ARP table according to IP address. If the MAC address of
the destination equipment is found in the ARP table, there is no need to send ARP
request any more. At the same time, due to the limited space in switch ARP table and the
frequent changes of network equipment, the switch should renew ARP table on time
(Delete the old items and add in new ones). The dynamic items in ARP table can be
deleted automatically, and this course is called ARP aging.
To make the network safer, ZXR10 5900E is able to change the learnt dynamic ARP to
static ARP, manual static ARP and eternal ARP table item. Both static ARP and eternal
ARP table item do not experience ARP aging. The eternal ARP still exist after reinitiating
the switch, however the static ARP will disappear. To prevent from ARP attack, ZXR10
5900E supports ARP protection service, restricting the number of the ARP the switch or
other L3 interfaces learn.

3.2.24 DHCPv4

The DHCP manages the IP address and other related configuration information used on
the network, to reduce the complexity in managing the address configuration. When the
DHCP service is used on the network, the client and server must be in the same
broadcast domain. If a network is built in this way, the ZXR10 5900E must provide the
DHCP SERVER function. In another application, the DHCP server and the users are not
in the same broadcast domain. The client obtains its address through transit via the
ZXR10 5900E. This is what referred to as DHCP relay technically.
The ZXR10 5900E implement the built-in DHCP SERVER function through the DHCP
protocol, to enable the dynamic address allocation and management of the DHCP
CLIENT, and at the same time provide the user management module on the destination
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