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Configuring IP
Table 6.2: IP Interface Parameters – routing switches (Continued)
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
sub-net to find servers attached to other sub-nets.
Note: To completely enable a client’s UDP
application request to find a server on another sub-
net, you must configure an IP helper address
consisting of the server’s IP address or the directed
broadcast address for the sub-net that contains the
server. e the next row.
The router helps
forward broadcasts for
the following UDP
application protocols:
• bootps
• dns
• netbios-dgm
• netbios-ns
• tacacs
• tftp
• time
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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 sub-net to a server on another sub-net.
None configured 6-69
Parameter Description Default See page...
Se
a.Some devices have a factory default, such as 209.157.22.154, used for troubleshooting during installation.
For routing switches, the address is on port 1 (or 1/1).
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