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Configuring IP
Step 4:
DHCP Server extracts the gateway
address from each packet and
assigns IP addresses for each
host within the appropriate range.
Server
DHCP
Server
207.95.7.6
Router
Host 1
200.95.6.15
Host 2
192.95.5.10
Sub-net 1
Sub-net 2
Hub
Power
Console
HP Switch 4000
DHCP response with IP addresses
Host 1 Host 2
for sub-nets 1, 2, 3, and 4:
192.95.5.10
200.95.6.15
202.95.1.35
202.95.5.25
Step 5:
IP addresses are distributed
to the appropriate hosts.
Host 3 Host 4
Host 3 Host 4
202.95.1.35
Sub-net 3
202.95.5.25
Sub-net 4
Figure 6.12 DHCP offers are forwarded back toward the requestors
Configuring DHCP Assist
You can associate a gateway list with a port. You must configure a gateway list when DHCP Assist is enabled on
the HP 6208M-SX. The gateway list contains a gateway address for each sub-net that will be requesting
addresses from a DHCP server. The list allows the stamping process to occur. Each gateway address defined on
the switch corresponds to an IP address of the HP routing switch interface or other router involved.
Up to eight addresses can be defined for each gateway list in support of ports that are multi-homed. When
multiple IP addresses are configured for a gateway list, the switch inserts the addresses into the discovery packet
in a round robin fashion.
Up to 32 gateway lists can be defined for each switch.
USING THE CLI
EXAMPLE:
To create the configuration indicated in Figure 6.11 and Figure 6.12:
HP6208(config)# dhcp-gateway-list 1 192.95.5.1
HP6208(config)# dhcp-gateway-list 2 200.95.6.1
HP6208(config)# dhcp-gateway-list 3 202.95.1.1 202.95.5.1
HP6208(config)# int e 2
HP6208(config-if-2)# dhcp-gateway-list 1
HP6208(config-if-2)# dhcp-gateway-list 2
HP6208(config-if-2)# dhcp-gateway-list 3
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