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15
IPv4 Management and Interfaces
259
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
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
Routes
pages.
All the IP addresses configured or assigned to the device are referred to as Management IP
addresses in this guide.
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.
Configuring a Loopback Interface
To configure an IPv4 loopback interface, add a loopback interface in
To configure an IPv6 loopback interface, add a loopback interface in the
This section covers the following topics:
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
IP Configuration
IPv4 Management and Interfaces
IPv4 Interface
and
IPv6 Interfaces
IPv4 Routes350-550>
IPv4
Interface.
IPv6
Addresses.
and
IPv6
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