IP Configuration
Overview
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
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IP Addressing
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
and
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
pages.
All the IP addresses configured or assigned to the device are referred to as
Management IP addresses in this guide.
Loopback Interface
This section includes the following topics:
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Configuring a Loopback Interface
Overview
The loopback interface is a virtual interface whose operational state is always up.
If the IP address that is configured on this virtual interface is used as the local
address when communicating with remote IP applications, the communication will
not be aborted even if the actual route to the remote application was changed.
The operational state of a loopback interface is always up. You define an IP
address (either IPv4 or IPv6) on it and use this IP address as the local IP address
for IP communication with remote IP applications. Communication remains intact
as long as the remote applications can be reached from any one of the switch's
active (non-loopback) IP interfaces. On the other hand, if the IP address of an IP
interface is used in communicating with remote applications, the communication
will be terminated when the IP interface is down.
A loopback interface does not support bridging; it cannot be a member of any
VLAN, and no layer 2 protocol can be enabled on it.
The IPv6 link-local interface identifier is 1.
