3Com Switch 8807, Configuration Manual

Page: 74 / 883

74 C
HAPTER
10: IP A
DDRESS
C
ONFIGURATION
By default, there is no host name associated to any host IP address.
Configuring the IP
Address of the VLAN
Interface
You can configure an IP address for every VLAN interface of the switch. Generally,
it is enough to configure one IP address for an interface. You can also configure 21
IP addresses for an interface at most, so that it can be connected to several
subnets. Among these IP addresses, one is the primary IP address and all others are
secondary.
Perform the following configuration in VLAN interface view.
n
When you use the ip address command to configure IP addresses of VLAN
interfaces, the system will prompts if you continue if the IP address you configure
is in different network segment from the existing IP address. If you do continue,
the IP address of the VLAN interface will be modified. In addition, if the ARP
entries (including dynamic ARP entries and static ARP entries) in the original
network segment match the new network segment, they will not be removed;
otherwise, the ARP entries in the original network segment will be removed.
By default, the IP address of a VLAN interface is null.
IP Address Protection
Configuration
How IP address protection works
The IP address protection functions can be used for bindings between IP addresses
and MAC addresses to ensure that only users using the IP addresses corresponding
to the specified MAC addresses can access the Internet while users using other IP
addresses cannot. This function works once configured on the switch, without
configurations on the server or client.
The IP address protection function needs to work together with the MAC address
auto filling function to complete bindings between IP addresses and MAC
addresses. When the MAC address auto filling function is enabled, you can
configure a static ARP entry that has only an IP address and the MAC address auto
filling function can automatically fill the ARP entry with the learned MAC address.
After the IP address protection function is enabled on a VLAN interface, the
current interface will no longer dynamically learn ARP mapping entries, and
existing dynamic ARP mapping entries will be removed. At the same time, the
switch will enable the MAC address auto filling function, so that the user can
Table 53 Configure the host name and the corresponding IP address
Operation Command
Configure the host name and the
corresponding IP address
ip host hostname ip - address
Cancel the host name and the corresponding
IP address
undo ip host hostname [ ip - address ]
Table 54 Configure an IP address for a VLAN interface
Operation Command
Configure an IP address for a VLAN interface
ip address ip - address { mask | mask - length } [
sub ]
Delete an IP address of a VLAN interface
undo ip address ip - address { mask |
mask - length } [ sub ]