Configuring Dhcp/Bootp Relay; Configuring The Dhcp Relay Agent Option (Option 82) - Extreme Networks ExtremeWare XOS Guide Manual

IP Unicast Routing
segment consisting of two subnets (192.168.36.0 and 172.16.45.0). The second multinetted segment spans
three ports (1:8, 2:9, and 3:10). RIP is enabled on both multinetted segments.
configure default delete port 5:5
create vlan multinet
configure multinet ipaddress 192.168.34.1
configure multinet add secondary-ipaddress 192.168.35.1
configure multinet add secondary-ipaddress 192.168.37.1
configure multinet add port 5:5
configure default delete port 1:8, 2:9, 3:10
create vlan multinet_2
configure multinet_2 ipaddress 192.168.36.1
configure multinet_2 add secondary-ipaddress 172.16.45.1
configure multinet_2 add port 1:8, 2:9, 3:10
configure rip add vlan multinet
configure rip add vlan multinet_2
enable rip
enable ipforwarding

Configuring DHCP/BOOTP Relay

After IP unicast routing has been configured, you can configure the switch to forward Dynamic Host
Configuration Protocol (DHCP) or BOOTP requests coming from clients on subnets being serviced by
the switch and going to hosts on different subnets. This feature can be used in various applications,
including DHCP services between Windows NT servers and clients running Windows 95. To configure
the relay function:
1 Configure VLANs and IP unicast routing.
2 Enable the DHCP or BOOTP relay function, using the following command:
enable bootprelay {vr <vrid>}
3 Configure the addresses to which DHCP or BOOTP requests should be directed, using the following
command:
configure bootprelay add <ip_address> {vr <vrid>}
To delete an entry, use the following command:
configure bootprelay delete [<ip_address> | all] {vr <vrid>}

Configuring the DHCP Relay Agent Option (Option 82)

After configuring and enabling the DHCP/BOOTP relay feature, you can enable the DHCP relay agent
option feature. This feature inserts a piece of information, called option 82, into any DHCP request
packet that is to be relayed by the switch. Similarly, if a DHCP reply received by the switch contains a
valid relay agent option, the option will be stripped from the packet before it is relayed to the client.
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