Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 80)

‐ RARP requires the IP host to be directly attached to the Layer 3 switch.
‐ An IP host and the BootP/DHCP server can be on different networks and on different
routers, so long as the routers are configured to forward ("help") the host boot request to
the boot server.
‐ You can centrally configure other host parameters on the BootP/DHCP server, in addition
to the IP address, and supply those parameters to the host along with its IP address.
To configure the Layer 3 switch to forward BootP/DHCP requests when boot clients and the boot
servers are on different subnets on different Layer 3 switch interfaces, refer to
BootP and DHCP relay
parameter configuration on page 83.
Disabling RARP
RARP is enabled by default. To disable RARP, enter the following command at the global CONFIG
level.
device(config)# no ip rarp
Syntax: [no] ip rarp
To re-enable RARP, enter the following command.
device(config)# ip rarp
Creating static RARP entries
You must configure the RARP entries for the RARP table. The Layer 3 switch can send an IP address
in reply to a client RARP request only if create a RARP entry for that client.
To assign a static IP RARP entry for static routes on a Brocade router, enter a command such as the
following.
device(config)# rarp 1 0000.0054.2348 10.53.4.2
This command creates a RARP entry for a client with MAC address 0000.0054.2348. When the Layer
3 switch receives a RARP request from this client, the Layer 3 switch replies to the request by sending
IP address 192.53.4.2 to the client.
Syntax: rap number mac-addr ip-addr
The number parameter identifies the RARP entry number. You can specify an unused number from 1
to the maximum number of RARP entries supported on the device. To determine the maximum
number of entries supported on the device, refer to the section "Displaying and modifying system
parameter default settings" in the FastIron Ethernet Switch Platform and Layer 2 Switching
Configuration Guide .
The mac-addr parameter specifies the MAC address of the RARP client.
The ip-addr parameter specifies the IP address the Layer 3 switch will give the client in response to
the client RARP request.
Changing the maximum number of static RARP entries supported
The number of RARP entries the Layer 3 switch supports depends on how much memory the Layer 3
switch has. To determine how many RARP entries your Layer 3 switch can have, display the system
default information using the procedure in the section "Displaying system parameter default values" in
the FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide .
Disabling RARP
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