Table of Contents
Advertisement
Introduction
Loopback Interface
Cisco Sx350 Ph. 2.2.5 Devices - Command Line Interface Reference Guide
•
ipv6_address%0—Refers to the IPv6 address on the single interface on
which an IPv6 address is defined.
•
ipv6_address—Refers to the IPv6 address on the single interface on which
an IPv6 address is defined.
When an IP application on a router wants to communicate with a remote IP
application, it must select the local IP address to be used as its IP address. It can
use any IP address defined on the router, but if this link goes down, the
communication is aborted, even though there might well be another IP route
between these IP applications.
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 name of the loopback interface is loopback1.
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.
Layer 3 Specification
IP Interface
IPv4 and IPv6 addresses can be assigned to a loopback interface.
The IPv6 link-local interface identifier is 1.
Routing Protocols
A routing protocol running on the switch supports the advertising of the IP prefixes
defined on the loopback interfaces via the routing protocol redistribution
mechanism.
If a layer 2 switch with one IPv4 address supports a loopback interface, the above
rules are replaced by the following ones:
This is the definition of the IP configuration when the device is in layer 2 mode:
•
Only one loopback interface is supported.
1
40
Advertisement
Table of Contents
