Lenovo ThinkSystem NE2552E, Application Manual

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© Copyright Lenovo 2018 Chapter 21: Basic IP Routing
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BOOTP Relay Agent
The NE2552E can function as a Bootstrap Protocol relay agent, enabling the switch
to forward a client request for an IP address up to two BOOTP servers with IP
addresses that have been configured on the switch.
When a switch receives a BOOTP request from a BOOTP client requesting an IP
address, the switch acts as a proxy for the client. The request is then forwarded as
a UDP Unicast MAC layer message to two BOOTP servers whose IP addresses are
configured on the switch. The servers respond to the switch with a Unicast reply
that contains the default gateway and IP address for the client. The switch then
forwards this reply back to the client.
Figure 35 shows a basic BOOTP network example.
Figure 35.
BOOTP Relay Agent Configuration
The use of two servers provide failover redundancy. The client request is
forwarded to both BOOTP servers configured on the switch. However, no health
checking is supported.
BOOTP Relay Agent Configuration
To enable the NE2552E to be the BOOTP forwarder, you need to configure the
BOOTP server IP addresses on the switch, and enable BOOTP relay on the
interface(s) on which the BOOTP requests are received.
Generally, you should configure the command on the switch IP interface that is
closest to the client, so that the BOOTP server knows from which IP subnet the
newly allocated IP address should come.
Use the following commands to configure the switch as a BOOTP relay agent:
Use the following command to enable the Relay functionality on an IP interface:
BOOT Client
asks for IP from
BOOTP server BladeCenter acts as
BOOTP Relay Agent
BOOTP Server
Boston Raleigh
20.1.1.1
10.1.1.2
NE2552E(config)# ip bootp-relay enable
NE2552E(config)# ip bootp-relay server
<1 ‐ 5>
address
<IPv4 address>
NE2552E(config)# interface ip
<interface number>
NE2552E(config-ip-if)# relay
NE2552E(config-ip-if)# exit