Configuring Default, Primary, And Preferred Addresses And Interfaces; Configuring The Primary Interface For The Router; Configuring The Primary Address For An Interface; Configuring The Preferred Address For An Interface - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

To disable the sending of protocol redirect messages for the entire router, include
the

Configuring Default, Primary, and Preferred Addresses and Interfaces

The router has a default address and a primary interface, and interfaces have primary
and preferred addresses.
The default address of the router is used as the source address on unnumbered
interfaces. The routing protocol process tries to pick the default address as the router
ID, which is used by protocols, including OSPF and internal BGP (IBGP).
The primary interface for the router is the interface that packets go out when no
interface name is specified and when the destination address does not imply a
particular outgoing interface.
An interface s primary address is used by default as the local address for broadcast
and multicast packets sourced locally and sent out the interface. An interface s
preferred address is the default local address used for packets sourced by the local
router to destinations on the subnet.
The default address of the router is chosen using the following sequence:
1.
2.
To configure these addresses and interfaces, you can do the following:

Configuring the Primary Interface for the Router

The primary interface for the router has the following characteristics:
By default, the multicast-capable interface with the lowest-index address is chosen
as the primary interface. If there is no such interface, the point-to-point interface
with the lowest index address is chosen. Otherwise, any interface with an address
Chapter 5: Configuring Protocol Family and Interface Address Properties
statement at the
no-redirects
The primary address on the loopback interface
The primary address on the primary interface is used.
Configuring the Primary Interface for the Router on page 199
Configuring the Primary Address for an Interface on page 200
Configuring the Preferred Address for an Interface on page 200
It is the interface that packets go out when you type a command such as ping
255.255.255.255—that is, a command that does not include an interface name
(there is no interface
type-0/0/0.0
does not imply any particular outgoing interface.
It is the interface on which multicast applications running locally on the router,
such as Session Announcement Protocol (SAP), do group joins by default.
It is the interface from which the default local address is derived for packets
sourced out an unnumbered interface if there are no non-127 addresses
configured on the loopback interface, lo0.
Configuring Default, Primary, and Preferred Addresses and Interfaces
hierarchy level.
[edit system]
lo0 that is not
qualifier) and where the destination address
127.0.0.1 is used.
199