BigIron RX Series Configuration Guide 161
53-1002253-01
Configuring IP parameters
7
Configuring IP parameters
Some parameters can be configured globally while others can be configured on individual
interfaces. Some parameters can be configured globally and overridden for individual interfaces.
Configuring IP addresses
You can configure an IP address on the following types of the device interfaces:
• Ethernet port
• Virtual routing interface (also called a Virtual Ethernet or “VE”)
• Loopback interface
By default, you can configure up to 24 IP addresses on each interface.
Also, the CAM can hold up to 256,000 IP address entries.
DHCP gateway stamp The router can assist DHCP/BootP Discovery packets from one
subnet to reach DHCP/BootP servers on a different subnet by
placing the IP address of the router interface that receives the
request in the request packet’s Gateway field.
You can override the default and specify the IP address to use for
the Gateway field in the packets.
NOTE: UDP broadcast forwarding for client DHCP/BootP requests
(bootpc) must be enabled and you must configure an IP
helper address (the server’s IP address or a directed
broadcast to the server’s subnet) on the port connected to
the client.
The lowest-numbered IP
address on the interface that
receives the request
page 220
UDP broadcast
forwarding
The router can forward UDP broadcast packets for UDP
applications such as BootP. By forwarding the UDP broadcasts,
the router enables clients on one subnet to find servers attached
to other subnets.
NOTE: To completely enable a client’s UDP application request to
find a server on another subnet, you must configure an IP
helper address consisting of the server’s IP address or the
directed broadcast address for the subnet that contains
the server. See the next row.
The router helps forward
broadcasts for the following
UDP application protocols:
• bootps
• dns
• netbios-dgm
• netbios-ns
• tacacs
• tftp
• time
page 217
IP helper address The IP address of a UDP application server (such as a BootP or
DHCP server) or a directed broadcast address. IP helper
addresses allow the router to forward requests for certain UDP
applications from a client on one subnet to a server on another
subnet.
None configured page 218
a. Some devices have a factory default, such as 209.157.22.154, used for troubleshooting during installation. For the
device, the address is on module 1 port 1 (or 1/1).
TABLE 44 IP interface parameters (Continued)
Parameter Description Default See page...
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