Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 34)

16 Brocade ICX 6650 Layer 3 Routing Configuration Guide
53-1002603-01
Basic IP parameters and defaults – Layer 3 Switches
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 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 (bootps) must be
enabled (this is enabled by default) and
you must configure an IP helper address
(the server IP address or a directed
broadcast to the server subnet) on the port
connected to the client.
The lowest-numbered IP
address on the interface
that receives the
request page 66
DHCP Client-Based
Auto-Configuration Allows the switch to obtain IP addresses from a
DHCP host automatically, for either a specified
(leased) or infinite period of time. Enabled page 80
DHCP Server All FastIron devices can be configured to function
as DHCP servers. Disabled page 67
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 UDP
application request to find a server on
another subnet, you must configure an IP
helper address consisting of the server 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 63
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 64
1. Some devices have a factory default, used for troubleshooting during installation. For Layer 3 Switches, the
address is on module 1 port 1 (or 1/1/1).
TABLE 3 IP interface parameters – Layer 3 Switches (Continued)
Parameter Description Default For more
information