3Com 3CBLSG48 User Manual page 24

If you use the automatic IP configuration method, you need to discover
the automatically allocated IP information before you can begin
management. Work through the "Viewing IP Information using the
Console Port" on page 17.
Manual IP Configuration
When you configure the IP information manually, the switch remembers
the information that you enter until you change it again.
You should use the Manual IP configuration method if:
You do not have a DHCP server on your network, or
You want to remove the risk of the IP address ever changing, or
Your DHCP server does not allow you to allocate static IP addresses.
Static IP addresses are necessary to ensure that the switch is always
allocated the same IP information.
For most installations, 3Com recommends that you configure the switch
IP information manually. This makes management simpler and more
reliable as it is not dependent on a DHCP server, and eliminates the risk
of the IP address changing.
To manually enter IP information for your switch, work through the
"Manually set the IP Address using the Console Port" on page 16.
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