DGS-3312SR Layer 3 Gigabit Switch
117
17
IP C
OMMANDS
(I
NCLUDING
IP M
ULTINETTING
)
IP Multinetting is a function that allows multiple IP interfaces to be assigned to the same VLAN. This is beneficial to
the administrator when the number of IPs on the original interface is insufficient and the network administrator wishes not to
resize the interface. IP Multinetting is capable of assigning another IP interface on the same VLAN without affecting the
original stations or settings of the original interface.
Two types of interfaces are configured for IP multinetting,
primary
and
secondary
,
and
every IP interface must be
classified as one of these. A
primary
interface refers to the first interface created on a VLAN, with no exceptions. All other
interfaces created will be regarded as
secondary
only, and can only be created once a
primary
interface has been configured.
There may be five interfaces per VLAN (one primary, and up to four secondary) and they are, in most cases, independent of
each other.
Primary
interfaces cannot be deleted if the VLAN contains a
secondary
interface. Once the user creates multiple
interfaces for a specified VLAN (
primary
and
secondary
), that set IP interface cannot be changed to another VLAN.
Application Limitation:
A multicast router cannot be connected to IP interfaces that are
utilizing the IP Multinetting function.
NOTE:
Only the primary IP interface will support the BOOTP relay agent.
IP Multinetting is a valuable tool for network administrators requiring a multitude of IP addresses, but configuring the Switch
for IP multinetting may cause troubleshooting and bandwidth problems, and should not be used as a long term solution.
Problems may include the Switch may use extra resources to process packets for multiple IP interfaces.
The amount of broadcast data, such as RIP update packets and PIM hello packets, will be increased.
The IP interface commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
enable ipif
{<ipif_name 12> | all}
create ipif
<ipif_name12> <network_address> <vlan_name 32> {secondary
| state [enable | disable]}
config ipif
<ipif_name12> [{ipaddress <network_address> | {vlan
<vlan_name 32> | state [enable | disable]} | bootp | dhcp]
show ipif
<ipif_name 12>
delete ipif
<ipif_name 12> | all
disable ipif
<ipif_name 12> | all
Each command is listed, in detail, in the following sections.
NOTE:
As a stand-alone switch or as a master switch in a switch stack,
the switch number will be referred to as 15 for all configurations, graphs
and tables.
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