Junos OS Interfaces Command Reference - Juniper Networks

NOTE: Point-to-Point Protocol over Ethernet (PPPoE) interfaces (pp0) are
supported on the J Series routers and the M120 router only. A PPPoE interface
is configured over an underlying Ethernet interface. For more information,
see PPPoE Interface Operational Mode Commands.
Logical Interfaces Assigned to a Logical System
Logical Systems Overview
• Logical Systems Overview on page 15
• Logical System Configuration Overview on page 15
• Scope of Logical System Administration on page 15
• Example: show interfaces terse on page 16
With Junos OS, you can partition a single physical system into multiple logical systems
that perform independent routing tasks. Each logical system has its own unique routing
tables, interfaces, policies, and routing instances. A set of logical systems within a single
router can handle the functions otherwise performed by several small routers, offering
an effective way to maximize the use of a single routing or switching platform.
NOTE: A virtual router does not have the same capabilities as a logical system.
A virtual router is a type of simplified routing instance that has a single routing
table. By contrast, a logical system is a partition of the main router and can
contain multiple virtual router routing instances. As a result, these two entities
are not equivalent.
Logical System Configuration Overview
Configuring a logical system consists of a sequence of tasks, some of which can only be
performed by you as the master administrator—a Junos user with superuser configuration
and verification privileges on the router. Other tasks can be performed by a logical system
administrator—a Junos user that you have assigned to the logical system and is thereby
granted configuration and verification privileges for only the logical systems to which
that user is assigned.
Scope of Logical System Administration
Logical system administrators are confined to the context of the logical systems to which
they are assigned. Any global configuration statements are restricted from them, and
command output is restricted to the context to which the logical system administrators
are assigned.
Copyright © 2012, Juniper Networks, Inc.
For Junos OS Release 9.1 and later, when a physical interface is specified within a logical
system context, the show interfaces command output only displays information about
the logical interfaces assigned to that logical system.
Chapter 1: Interface Types
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