Configuring IP
December 2005
© Foundry Networks, Inc.
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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’s
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 and Modifying System Parameter Default Settings” on page 4-8.
If your Layer 3 Switch allows you to increase the maximum number of RARP entries, you can use a procedure in
the same section to do so.
NOTE:
You must save the configuration to the startup-config file and reload the software after changing the
RARP cache size to place the change into effect.
Configuring UDP Broadcast and IP Helper Parameters
Some applications rely on client requests sent as limited IP broadcasts addressed to the UDP’s application port. If
a server for the application receives such a broadcast, the server can reply to the client. Routers do not forward
subnet directed broadcasts, so the client and server must be on the same network for the broadcast to reach the
server. If the client and server are on different networks (on opposite sides of a router), the client’s request cannot
reach the server.
You can configure the Layer 3 Switch to forward clients‘ requests to UDP application servers. To do so:
•
Enable forwarding support for the UDP application port, if forwarding support is not already enabled.
•
Configure a helper adders on the interface connected to the clients. Specify the helper address to be the IP
address of the application server or the subnet directed broadcast address for the IP sub-net the server is in.
A helper address is associated with a specific interface and applies only to client requests received on that
interface. The Layer 3 Switch forwards client requests for any of the application ports the Layer 3 Switch is
enabled to forward to the helper address.
Forwarding support for the following application ports is enabled by default.
•
bootps (port 67)
•
dns (port 53)
•
tftp (port 69)
•
time (port 37)
•
netbios-ns (port 137)
•
netbios-dgm (port 138)
•
tacacs (port 65)
NOTE:
The application names are the names for these applications that the Layer 3 Switch software recognizes,
and might not match the names for these applications on some third-party devices. The numbers listed in
parentheses are the UDP port numbers for the applications. The numbers come from RFC 1340.
NOTE:
As shown above, forwarding support for BootP/DHCP is enabled by default. If you are configuring the
Layer 3 Switch to forward BootP/DHCP requests, see “Configuring BootP/DHCP Forwarding Parameters” on
page 16-49.
You can enable forwarding for other applications by specifying the application port number.
You also can disable forwarding for an application.
Содержание FastIron Edge Switch X424
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