Specifications

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DCS-3950 series Ethernet switch manual
Parameters：
<maxNum>: the number of defense action on each port, the range of which is 1-200, and
the value of which is 10 by default
default：recover to the default value.
Command mode：Globe Mode.
Default：The default value is 10.
Usage Guide：Set the max number of defense actions to avoid the resource exhaustion of
the switch caused by attacks. If the number of alarm information is larger than the set
value, then the earliest defense action will be recovered forcibly in order to send new
defense actions.
Example：Set the number of port defense actions as 100.
Switch(Config)#ip dhcp snooping action maxnum 100
19.2.2.10 ip dhcp snooping information enable
Command：ip dhcp snooping information enable
no ip dhcp snooping information enable
Function：Enable DHCP SNOOPING OPTION 82 function. No command close DHCP
Snooping Option82 function.
Parameters：None
Default：DHCP Snooping default close Option 82 function.
Command mode：Globe Mode.
Usage Guide：Only set this command DHCP SNOOPING, the standard option 82 can be
added and forwarded by DHCP packet. Option 82 sub-option 1 (circuit ID option) is
standard vlan name add physical port, such as ‘Vlan1+Ethernet0/0/12’. Option 82
sub-option 2 (remote ID option) is switch CPU MAC, such as ‘00030f023301’. If getting
DHCP request packet with option 82, DHCP Snooping will use self option 82 to replace
the option 82 in request packet. If getting DHCP reply packet with option 82, DHCP
Snooping will drop the option 82 and then forward DHCP packet.
Example：Enable DHCP SNOOPING option 82 function.
Switch(Config)#ip dhcp snooping enable
Switch(Config)# ip dhcp snooping binding enable
Switch(Config)# ip dhcp snooping information enable
19.2.2.11 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 的IP in dotted-decimal notation.