Nortel Web OS 10.0, Application Manual

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Web OS 10.0 Application Guide
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Chapter 1: Basic IP Routing
212777-A, February 2002
respond as a a UDP Unicast message back to the switch, with the default gateway and IP
address for the client. The destination IP address in the server response represents the interface
address on the switch that received the client request. This interface address tells the switch on
which VLAN to send the server response to the client.
DHCP Relay Agent Configuration
To enable the Alteon Web switch to be the BOOTP forwarder, you need to configure the
DHCP/BOOTP server IP addresses on the switch. Generally, you should configure the com-
mand on the switch IP interface closest to the client so that the DHCP server knows from
which IP subnet the newly allocated IP address should come.
The following figure shows a basic DHCP network example:
Figure 1-5 DHCP Relay Agent Configuration
In Alteon Web switch implementation, there is no need for primary or secondary servers. The
client request is forwarded to the BOOTP servers configured on the switch. The use of two
servers provide failover redundancy. However, no health checking is supported.
Use the following commands to configure the switch as a DHCP relay agent:
Additionally, DHCP Relay functionality can be assigned on a per interface basis. Use the fol-
lowing command to enable the Relay functionality:
>> # /cfg/ip/bootp
>> Bootstrap Protocol Relay# addr (Set IP address of BOOTP server)
>> Bootstrap Protocol Relay# addr2
(Set IP address of 2nd BOOTP server)
>> Bootstrap Protocol Relay# on
(Globally turn BOOTP relay on)
>> Bootstrap Protocol Relay# off
(Globally turn BOOTP relay off)
>> Bootstrap Protocol Relay# cur
(Display current configuration)
>> # /cfg/ip/if
<interface number>
/relay ena
DHCP Client Web Switch
DHCP Relay Agent
DHCP Server
Boston Atlanta
20.1.1.1 10.1.1.2