IP Configuration
Overview
282 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
16
IP address collisions occur when the same IP address is used in the same IP subnet by more
than one device. Address collisions require administrative actions on the DHCP server and/or
the devices that collide with the device.
The IP address assignment rules for the default VLAN are as follows:
• Unless the device is configured with a static IPv4 address, it issues DHCPv4 queries
until a response is received from a DHCPv4 server.
• If the IP address on the device is changed, the device issues gratuitous ARP packets to
the corresponding VLAN to check IP address collisions. This rule also applies when
the device reverts to the default IP address.
• The system status LED changes to solid green when a new unique IP address is
received from the DHCP server. If a static IP address has been set, the system status
LED also changes to solid green. The LED flashes when the device is acquiring an IP
address and is currently using the factory default IP address 192.168.1.254.
• The same rules apply when a client must renew the lease, prior to its expiration date
through a DHCPREQUEST message.
• With factory default settings, when no statically-defined or DHCP-acquired IP address
is available, the default IP address is used. When the other IP addresses become
available, the addresses are automatically used. The default IP address is always on the
management VLAN.
The device can have multiple IP addresses. Each IP address can be assigned to specified ports,
LAGs, or VLANs. These IP addresses are configured in the IPv4 Interface and IPv6 Interfaces
pages. The device can be reached at all its IP addresses from the corresponding interfaces.
A predefined, default route is not provided. To remotely manage the device, a default route
must be defined. All DHCP-assigned default gateways are stored as default routes. In addition,
you can manually define default routes. This is defined in the IPv4 Static Routes and IPv6
Routes pages.
All the IP addresses configured or assigned to the device are referred to as Management IP
addresses in this guide.
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