IP addressing with multiple VLANs

In the factory default configuration, the switch has one, permanent default VLAN (named DEFAULT_VLAN) that includes all ports on the switch. Thus, when only the default VLAN exists in the switch, if you assign an IP address and subnet mask to the switch, you are actually assigning the IP addressing to the DEFAULT_VLAN.

  • If multiple VLANs are configured, then each VLAN can have its own IP address. This is because each VLAN operates as a separate broadcast domain and requires a unique IP address and subnet mask. A default gateway (IP) address for the switch is optional, but recommended.

  • In the factory default configuration, the default VLAN (named DEFAULT_VLAN) is the switch’s primary VLAN. The switch uses the primary VLAN for learning the default gateway address. The switch can also learn other settings from a DHCP or Bootp server, such as (packet) Time-To-Live (TTL), and Timep or SNMP settings. (Other VLANs can also use DHCP or BootP to acquire IP addressing. However, the switch’s gateway, TTL, and TimeP or SNTP values, which are applied globally, and not per-VLAN, will be acquired through the primary VLAN only, unless manually set by using the CLI, Menu, or WebAgent. (If these parameters are manually set, they will not be overwritten by alternate values received from a DHCP or Bootp server.) For more on VLANs, see the titled “Static Virtual LANs” in the Advanced Traffic Management Guide for your switch.

  • The IP addressing used in the switch must be compatible with your network. That is, the IP address must be unique and the subnet mask must be appropriate for your IP network.

  • If you change the IP address through either Telnet access or the WebAgent, the connection to the switch will be lost. You can reconnect by either restarting Telnet with the new IP address or entering the new address as the URL in your web browser.