Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X User Manual

Chapter 11
Configuring Virtual Routers
E Series routers allow you to create multiple logical or virtual routers in a single
router. Each virtual router has its own separate set of IP interfaces, forwarding table,
and instances of routing protocols.
This chapter contains the following sections:
■ Overview on page 539
■ Platform Considerations on page 541
■ References on page 541
■ Configuring Virtual Routers on page 541
■ Monitoring Virtual Routers on page 545
Overview
Multiple distinct routers are supported within a single router, which allows service
providers to configure multiple, separate, secure routers within a single chassis. These
routers are identified as virtual routers (VRs). Applications for this function include
the creation of individual routers dedicated to wholesale customers, corporate virtual
private network (VPN) users, or a specific traffic type.
Default Virtual Router
When you first boot your router, it creates a default virtual router. The only difference
between the default VR and any other router is that you cannot create or delete the
default VR. Just like any other router, the default VR gets its IP addresses when you
add interfaces to it.
Virtual Router Instances
E Series routers can support up to 1,000 forwarding tables; that is, up to a total of
1,000 VRs and VPN routing and forwarding (VRF) instances. Each VRF has a
forwarding table. A network device attaching to a router detects a router interface.
The attaching device has no notion of the virtual router behind the interface.
For example, a physical ATM link may have circuits that are connected to different
VRs. The physical and data link layers are not aware that there are multiple router
instances. See Figure 28 on page 540.
Overview ■ 539

Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Specifications

General

Brand	Juniper
Model	SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X
Category	Software
Language	English