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Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 179
IP Configuration
IP interface addresses can be configured manually by the user, or automatically
configured by a DHCP server.
This chapter provides information for defining the switch IP addresses, either
manually or by making the switch a DHCP client.
It includes the following sections:
• IP Addressing
• IPv4 Management and Interface
• IPv6 Management and Interface
• Configuring Domain Name System
IP Addressing
The switch has one IPv4 address and one IPv6 interface in the management VLAN.
This IP address and the default gateway can be configured manually, or by DHCP.
The static IP address and default gateway are configured on the IPv4 Interface
and IPv6 Interface pages. The switch uses the default gateway, if configured, to
communicate with devices that are not in the same IP subnet with the switch. By
default, VLAN 1 is the management VLAN, but this can be modified. The switch
can only be reached at the configured IP address through its management VLAN.
The factory default setting of the IPv4 address configuration is DHCPv4. This
means that the switch acts as a DHCPv4 client, and sends out a DHCPv4 request
during boot up.
If the switch receives a DHCPv4 response from the DHCPv4 server with an IPv4
address, it sends Address Resolution Protocol (ARP) packets to confirm that the IP
address is unique. If the ARP response shows that the IPv4 address is in use, the
switch sends a DHCPDECLINE message to the offering DHCP server, and sends
another DHCPDISCOVER packet that restarts the process.
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