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CHAPTER 7
Managing Interchassis Redundancy
ICR Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure interchassis redundancy (ICR) on your E Series
router.
ICR Overview on page 169
ICR Platform Considerations on page 171
ICR Terms on page 172
ICR References on page 172
ICR Scaling Considerations on page 172
Interaction with RADIUS for ICR on page 173
Configuring an ICR Partition on page 175
Configuring the Interface on Which the ICR Partition Resides on page 176
Configuring VRRP Instances to Match ICR Requirements on page 177
Naming ICR Partitions on page 178
Grouping ICR Subscribers Based on S-VLAN IDs on page 178
Grouping ICR Subscribers Based on VLAN IDs on page 179
Example: Configuring ICR Partitions That Group Subscribers by S-VLAN ID on page 180
Using RADIUS to Manage Subscribers Logging In to ICR Partitions on page 182
Monitoring the Configuration of an ICR Partition Attached to an Interface on page 183
Monitoring the Configuration of ICR Partitions on page 184
A broadband services router (BSR) aggregates many subscribers and services such as
video on demand (VoD), voice over IP (VoIP), Internet Protocol television (IPTV), and
the Internet, simultaneously. If the router fails because of hardware failures, subscriber
downtime can result.
Interchassis redundancy (ICR) enables you to minimize subscriber downtime when the
router or access interface on the edge router fails. ICR accomplishes this by re-creating
subscriber sessions on the backup router that were originally terminated on the failed
router. In this way, ICR enables you to completely recover from router failure. ICR uses
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