Qtech QSW-8200-28T-POEAC- DC [71/79] Ip user helper address

User Manual

Chapter 5. Commands for DHCP Snooping 71

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5.28 ip user helper-address

 Command: ip user helper-address <svr_addr> [port <udp_port>] source <src_addr>

[secondary]

 no ip user helper-address [secondary]

 Function: Set the address and port of HELPER SERVER.

 Parameters:

 <svr_addr>: The IP address of HELPER SERVER IP in dotted-decimal notation.

o udp_port: The UDP port of HELPER SERVER, the range of which is1－65535, and

its default value is 9119.

o src_addr: The local management IP address of the switch, in dotted-decimal

notation.

o sencondary: Whether it is a secondary SERVER address.

 Command Mode: Global mode

 Default Settings: There is no HELPER SERVER address by default.

 Usage Guide: DHCP SNOOPING will send the monitored binding information to HELPER

SERVER to save it. If the switch starts abnormally, it can recover the binding data from

HELPER SERVER. The HELPER SERVER function usually is integrated into DCBI packet.

The DHCP SNOOPING and HELPER SERVER use the UDP protocol to communicate, and

guarantee the arrival of retransmitted data. HELPER SERVER configuration can also be

used to sent DOT1X user data from the server, the detail of usage is described in the

chapter of dot1x configuration.

 Two HELPER SERVER addresses are allowed, DHCP SNOOPING will try to connect to

PRIMARY SERVER in the first place. Only when the PRIMARY SERVER is unreachable, will

the switch c HELPER SERVER connects to SECONDARY SERVER.

 Please pay attention: source address is the effective management IP address of the

switch, if the management IP address of the switch changes, this configuration should

be updated in time.

 Example: Set the local management IP address as 100.1.1.1, primary HELPER SERVER

address as 100.1.1.100 and the port as default value.

 switch(config)#interface vlan 1

 switch(Config- If-Vlan1)#ip address 100.1.1.1 255.255.255.0

 switch(Config-if-Vlan1)exit

 switch(config)#ip user helper-address 100.1.1.100 source 100.1.1.1

5.29 ip user private packet version two

 Command: ip user private packet version two

 no ip user private packet version two

 Function: The switch choose private packet version two to communicate with

trustview.

 Parameter: None.