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Configuring IP Addressing
IP Configuration
Configure Multiple IP Addresses on a VLAN (Multinetting). You can
configure one primary IP address per VLAN and up to seven secondary IP
addresses for the same VLAN. That is, the switch enables you to assign up to
eight networks to a VLAN.
Each IP address on a VLAN must be for a separate subnet.
The VLAN must have a manual primary IP address configured before any
secondary addresses configured on the VLAN will be enabled.
If the primary IP address on a VLAN is configured for DHCP-Bootp, the
switch does not accept secondary IP addresses on that VLAN.
DHCP operates only to provide primary IP addressing, and is not used for
providing secondary IP addressing.
The switch allows up to 512 secondary subnet address assignments to
VLANs.
Syntax: [ no ] vlan <vlan-id> ip address <ip-address/mask-length> secondary
[ no ] vlan <vlan-id> ip address <ip-address> <mask-bits> secondary
For example, if you wanted to multinet VLAN_20 (VID = 20) with its primary
IP address and two secondary IP addresses shown below, you would perform
steps similar to the following. (For this example, assume that the primary IP
addressing is already configured.)
Status VID IP Address Subnet Mask
Primary 20 10.25.33.101 255.255.240.0
Secondary 20 10.26.33.101 255.255.240.0
Secondary 20 10.27.33.101 255.255.240.0
1. Go to VLAN 20.
2. Configure two secondary
IP addresses on VLAN
20.
3. Display IP addressing.
Note: A VLAN’s secondary IP
entries are listed below the
VLAN’s name and primary IP
address.
Figure 7-4. Example of Configuring and Displaying a Multinetted VLAN
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