3Com 3C13636 Configuration Manual page 400

3Com Router 3000 Ethernet Family
Configuration Guide
Table 1-2 Configure main IP address of an interface
Configure main IP address of an interface
A mask identifies the netid boundary of an IP address. Suppose an Ethernet interface is
assigned the IP address 129.9.30.42 with the mask of 255.255.0.0. Logic AND the IP
address with the mask; then you can know that the Ethernet interface is assigned to the
network segment 129.9.0.0.
Your main IP address configuration can overwrite the existing one, if there is any.
By default, no main IP address is assigned to any interface.
II. Configuring subordinate IP address of an interface
Besides the main IP address, several subordinate IP addresses can be configured on
an interface. The purpose of assigning subordinate IP addresses is to have the same
interface located in different sub-nets, to create network routes with the same interface
as the output port, and set up connection via the same interface to multiple sub-nets.
Perform the following configuration in interface view.
Table 1-3 Configure a subaddress on an interface
Configure a subaddress on an interface.
By default, no subaddress is configured.
You can configure up to 32 addresses on an interface, including the main IP address
and subaddresses.
Caution:
For an interface that is configured to allocate IP addresses through BOOTP, DHCP, or
PPP negotiation, you cannot define subaddresses.
III. Deleting IP addresses on an interface
Perform the following configuration in interface view.
Operation
Operation
3Com Corporation
1-5
Chapter 2 IP Address Configuration
Command
ip address ip-address net-mask
Command
ip address ip-address net-mask sub