Foundry Networks Switch and Router Installation And Configuration Manual page 524

Foundry Switch and Router Installation and Configuration Guide
Step 4:
DHCP Server extracts the gateway
address from each packet and
assigns IP addresses for each
host within the appropriate
range.
DHCP response with IP addresses
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.
Figure 15.12 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
a Foundry Layer 2 Switch. 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 Layer 2 Switch corresponds to an IP address of the Foundry router 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 Layer 2 Switch inserts the addresses into the
discovery packet in a round robin fashion.
Up to 32 gateway lists can be defined for each Layer 2 Switch.
USING THE CLI
EXAMPLE:
To create the configuration indicated in Figure 15.11 and Figure 15.12:
FastIron(config)# dhcp-gateway-list 1 192.95.5.1
FastIron(config)# dhcp-gateway-list 2 200.95.6.1
FastIron(config)# dhcp-gateway-list 3 202.95.1.1 202.95.5.1
FastIron(config)# int e 2
FastIron(config-if-2)# dhcp-gateway-list 1
FastIron(config-if-2)# int e8
FastIron(config-if-8)# dhcp-gateway-list 3
15 - 82
DHCP
Server
Server
207.95.7.6
Server
FastIron Workgroup
Link Link
Activity Activity
Console
Power
192.95.5.10
Host 1
192.95.5.x
Sub-net 1
202.95.1.35
Host 3
202.95.1.x
Sub-net 3
Router
200.95.6.15
Host 2
200.95.6.x
Sub-net 2
202.95.5.25
Host 4
202.95.5.x
Sub-net 4
December 2000