Allied Telesis Rapier i Series, AT-8600 Series manual For layer 3 support, enable the Bootp Relay

Configuration examples

XConfigure the switch’s IP:

enable		ip
add ip		int=vlan48 ip=10.11.67.254 mask=255.255.255.0
add	ip	int=vlan50 ip=10.50.1.254 mask=255.255.255.0
add	ip	rou=0.0.0.0 mask=0.0.0.0 int=vlan50 next=10.50.1.1

XFor layer 3 support, enable the BOOTP Relay:

enable bootp relay

add bootp relay=10.50.1.100

Here the DHCP server is set to 10.50.1.100.

XEnable DHCP snooping and Option 82 support:

enable dhcpsnooping

enable dhcpsnooping option82

Note: It is also possible to enable DHCP snooping ARP security. If enabled this will ensure that ARP packets received on un-trusted ports are only permitted if they originate from an IP address that has been allocated and snooped by DHCP (enable dhcpsnooping arpsecurity).

XDefine the DHCP snooping trusted port:

set dhcpsnooping port=25 trusted=yes

This port is open for generating and receiving Option 82 information. By default, the other ports are non-trusted.

XDefine the maximum number of DHCP leasees permitted on each port:

set dhcpsnooping port=1-24 maxlease=1

XDefine the string that will be used in the subscriber-ID suboption portion of the Option 82 inserted into DHCP packets:

set dhcpsnooping port=1 subscriberid="Ground Floor Room 1"

Page 18 AlliedWare™ OS How To Note: DHCP Snooping on Rapier-style switches