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Cisco Small Business 200 Series Smart Switch Administration Guide 224
IP Configuration
IP interface addresses can be configured manually by the user, or automatically
configured by a DHCP server. This section provides information for defining the
device IP addresses, either manually or by making the device a DHCP client.
This section covers the following topics:
• Overview
• IPv4 Management and Interfaces
• Domain Name
Overview
Layer 2 IP Addressing
The device has up to one IPv4 address and up to two IPv6 interfaces (either
“native” interface or Tunnel) 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 page. The device uses
the default gateway, if configured, to communicate with devices that are not in the
same IP subnet as the device. By default, VLAN 1 is the management VLAN, but
this can be modified. The device 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 device acts as a DHCPv4 client, and sends out a DHCPv4 request
during boot up.
If the device 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
device sends a DHCPDECLINE message to the offering DHCP server, and sends
another DHCPDISCOVER packet that restarts the process.