Default-Address-Selection - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Complete Software Guide for Junos

default-address-selection

Syntax
Hierarchy Level
Release Information
Description
Default
Required Privilege
Level
Related
Documentation
204
®
OS for EX Series Ethernet Switches, Release 10.3
default-address-selection;
[edit system]
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Use the loopback interface,
when the packet is sent through a routed interface, but not when the packet is sent
through a local interface such as
or switch's Routing Engine.
The default address is used as the source address for all locally generated IP packets on
outgoing interfaces that are unnumbered. If an outgoing interface is numbered, the default
address is chosen using the following sequence:
The primary address on the loopback interface
The primary address for the primary interface or the preferred address (if configured)
for the primary interface is used.
By default, the primary address on an interface is selected as the numerically lowest
local address configured on the interface.
An interface's primary address is used by default as the local address for broadcast
and multicast packets sourced locally and sent out through the interface. An interface's
preferred address is the default local address used for packets sourced by the local
router or switch to destinations on the subnet. By default, the numerically lowest local
address configured for the interface is chosen as the preferred address on the subnet.
To configure a different primary address or preferred address, include the
statement at the
preferred
family family address address
interface-name unit logical-unit-number family family address address
For more information about default, primary, and preferred addresses for an interface,
see "Configuring Default, Primary, and Preferred Addresses and Interfaces" in the Junos
OS Network Interfaces Configuration Guide.
system—To view this statement in the configuration.
system-control—To add this statement to the configuration.
Configuring the JUNOS Software to Select a Fixed Source Address for Locally Generated
TCP/IP Packets
Junos OS Network Interfaces Configuration Guide
, as the source address for all locally generated IP packets
lo0
fxp0 . The lo0 interface is the interface to the router's
that is not
lo0
[edit interfaces interface-name unit logical-unit-number
or
[edit logical-systems logical-system-name interfaces
is used.
127.0.0.1
primary
hierarchy levels.
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