xStack
17
IP COMMANDS (INCLUDING MULTIPLE IP INTERFACES PER
VLAN)
Multiple IP interfaces per VLAN 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. Multiple IP interfaces per VLAN is a function that enables the Switch to be 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 multiple IP interfaces per VLAN, 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.
Multiple IP interfaces per VLAN is a valuable tool for network administrators requiring a multitude of IP addresses, but configuring the Switch for Multiple IP interfaces per VLAN 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 |
create ipif | <ipif_name 12> <network_address> <vlan_name 32> {secondary |
| state [enabled disabled]} |
config ipif | <ipif_name 12> [{ ipaddress <network_address> vlan |
| <vlan_name 32> state [enabled disabled]} bootp dhcp] |
enable ipif | {<ipif_name 12> all} |
|
|
disable ipif | {<ipif_name 12> all} |
|
|
delete ipif | {<ipif_name 12> all} |
|
|
show ipif | {<ipif_name 12>} |
|
|
Each command is listed, in detail, in the following sections.
create ipif
Purpose | Used to create an IP interface on the Switch. |
Syntax | create ipif <ipif_name 12> <network_address> <vlan_name |
| 32> {secondary {state [enabled disabled]} |
Description | This command will create an IP interface. |
Parameters | <ipif_name 12> − The name for the IP interface to be created. The |
| user may enter an alphanumeric string of up to 12 characters to |
| define the IP interface. |
| <network_address> − IP address and netmask of the IP interface |
134
