Dhcp Snooping/Option82 - Zte ZXR10 2920 User Manual

ZXR10 2920/2928/2952
DHCP Server
and Client
Strengthening
of Network
194 Confidential and Proprietary Information of ZTE CORPORATION
(V1.0)
Access Switch User Manual （Volume I）
zte(cfg)#set gvrp trunk 2 enable
zte(cfg)#set gvrp trunk 2 disable
zte(cfg)#set gvrp trunk 2 registration fixed
zte(cfg)#set gvrp trunk 2 registration forbidden
zte(cfg)#set gvrp trunk 2 registration normal
In this example, show GVRP configuration status.
zte(cfg)#show gvrp
GVRP is enabled!
PortId Status
------ -------- ------------ -----------------
2 Enabled
00. 00
T2 Enabled
00. 00

DHCP Snooping/Option82

DHCP (Dynamic Host Configuration Protocol) is a protocol that
the network host sends request to server to get host
configuration in dynamic mode.
As having no IP address, DHCP servers interact in broadcasting
way, and course is transparent.
between DHCP server and client.
that establish a private and illegal way, which causes confusion
to part of the hosts of their address distribution, gateway and
DNS parameters,
connect to the external network.
There will be IP deceiving, MAC address deceiving and user ID
deceiving from illegal client,
address. DHCP Snooping and Option82 are designed to solve
these safety problems.
filtering, is to detect legality of DHCP packets based on some
special rules and filter illegal packets.
to provide more additional information, and then strengthen the
network safety ability.
Typical applications of DHCP Snooping and Option82 are shown
in Figure 34.
Registration LastPduOrigin
Fixed 00.
Normal 00.
There is no authentication
There may be DHCP servers
and make it impossible for the hosts to
and exhaustion of DHCP server
DHCP Snooping, namely DHCP packet
00. 00.
00. 00.
Use Option82 technique
00.
00.