Configuring IP

Table 6.2: IP Interface Parameters – routing switches (Continued)

Parameter

Description

Default

See page...

 

 

 

 

UDP broadcast

The router can forward UDP broadcast packets for

The router helps

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forwarding

UDP applications such as BootP. By forwarding the

forward broadcasts for

 

 

UDP broadcasts, the router enables clients on one

the following UDP

 

 

sub-net to find servers attached to other sub-nets.

application protocols:

 

 

Note: To completely enable a client’s UDP

•

bootps

 

 

application request to find a server on another sub­

•

dns

 

 

net, you must configure an IP helper address

 

 

 

 

 

 

consisting of the server’s IP address or the directed

•

netbios-dgm

 

 

broadcast address for the sub-net that contains the

•

netbios-ns

 

 

server. See the next row.

 

 

 

 

 

 

 

•

tacacs

 

 

 

•

tftp

 

 

 

•

time

 

 

 

 

 

IP helper

The IP address of a UDP application server (such as

None configured

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address

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.

 

 

 

 

 

 

 

 

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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