About the Documentation

E Series and JUNOSe Documentation and Release Notes

Audience

E Series and JUNOSe Text and Syntax Conventions

Obtaining Documentation

Documentation Feedback

Requesting Technical Support

Service Availability

Service Availability Overview

Service Availability Versus High Availability

Understanding Service Availability Features

Module Redundancy

Stateful SRP Switchover

Unified ISSU

VRRP

Interchassis Redundancy

Managing Module Redundancy

Line Module Redundancy Overview

Module Requirements

ERX7xx Models and ERX14xx Models

E120 and E320 Routers

IOA Behavior When the Router Reboots

Line Module Behavior When Disabling or Enabling IOAs

Automatic Switchover

Limitations of Automatic Switchover

Reversion After Switchover

Configuring Line Module Redundancy

Managing Line Module Redundancy

SRP Module Redundancy

SRP Module Behavior

Specifying the Configuration for Redundant SRP Modules

Installing a Redundant SRP Module

Managing SRP Module Redundancy

Switching to the Redundant SRP Module

Upgrading Software on a Redundant SRP Module

Monitoring the Status LEDs

Monitoring Line Module and SRP Module Redundancy

Managing Port Redundancy

Managing Stateful SRP Switchover

Understanding Stateful SRP Switchover

Platform Considerations

Module Requirements

Redundancy Modes of Operation

File System Synchronization Mode

High Availability Mode

Understanding SRP State Behavior

Disabled State

Initializing State

Active State

Pending State

Application Support

Before Activating High Availability

Activating High Availability

Deactivating High Availability

Setting the IP Interface Priority

Upgrading Software

Monitoring Stateful SRP Switchover

Stateful SRP Switchover show Commands

Clearing the Redundancy History

Configuring a Unified In-Service Software Upgrade

Unified ISSU Overview

Router Behavior During a Unified In-Service Software Upgrade

Unified ISSU Platform Considerations

Unified ISSU Terms That Describe SRP and Line Module Behavior

Unified ISSU References

Unified ISSU Phases Overview

Unified ISSU Initialization Phase Overview

Application Data Upgrade on the Standby SRP Module

SNMP Traps

Unified ISSU Upgrade Phase Overview

Exceptions During the Upgrade Phase

Verification of Requirements

Upgrade Setup

Line Module Arming

Line Module Control Plane Upgrade

SRP Module Switchover

Line Module Forwarding Plane Upgrade

Unified ISSU Service Restoration Phase Overview

Application Support for Unified ISSU

Unexpected Application-Specific Behavior During Unified ISSU

AAA Authentication and Authorization Disabled

ATM Affected Behaviors

ILMI Sessions Not Maintained

OAM CC Effects on VCC

OAM VC Integrity Verification Cessation

Port Data Rate Monitoring Cessation

VC and VP Statistics Monitoring Halts Unified ISSU Progress

DHCP Affected Behaviors

DHCP Common Component Information Suspended

DHCP Relay and DHCP Relay Proxy Prevent Unified ISSU

DHCP Packet Capture Halted on Line Modules

DoS Protection State Freeze

Ethernet Affected Behaviors

ARP Packets Briefly Not Sent or Received

Link Aggregation interruption

Port Data Rate Monitoring Halted

VLAN Statistics Monitoring Halts Unified ISSU Progress

FTP Server File Transfer Behaviors

IS-IS Effects on Graceful Restart and Network Stability

Configuring Graceful Restart Before Unified ISSU Begins

Configuring Graceful Restart When BGP And LDP Are Configured

Routing Around the Restarting Router to Minimize Network Instability

L2TP Failover of Established Tunnels

OSPF Effects on Graceful Restart, Timeouts, and Network Stability

Configuring Graceful Restart Before Unified ISSU Begins

Configuring Graceful Restart When BGP And LDP Are Configured

Configuring a Longer Dead Interval Than Normal

Routing Around the Restarting Router to Minimize Network Instability

PIM Suspended During Unified ISSU

Subscriber Logins and Logouts Suspended During Unified ISSU

Subscriber Statistics Accumulation or Deletion

SONET/SDH Behavior During Unified ISSU

T3

TACACS+ Services Not Available

Interruption in Traffic Forwarding for Layer 3 Routing and Signaling Protocols

Recommended Routing Protocol Timer Settings

Before You Begin a Unified In-Service Software Upgrade

Hardware Requirements for Unified ISSU

Software Requirements for Unified ISSU

Upgrading Router Software with Unified ISSU

Halting the Unified ISSU Process and Restoring the Original State of the Router

Halting Unified ISSU During Initialization Phase

Halting Unified ISSU During Upgrade Phase

Monitoring a Unified In-Service Software Upgrade

Configuring VRRP

VRRP Overview

VRRP Terms

Platform Considerations

References

How VRRP Works

Configuration Examples

Basic VRRP Configuration

Commonly Used VRRP Configuration

VRRP Configuration Without the Real Address Owner

How VRRP Is Implemented in E Series Routers

Router Election Rules

Configuring VRRP

Configuring the IP Interface

Creating VRIDs

Configuration Steps

Changing Object Priority

Monitoring VRRP

Managing Interchassis Redundancy

ICR Overview

ICR Platform Considerations

Interface Specifiers

ICR Terms

ICR References

ICR Scaling Considerations

1:1 Subscriber Redundancy in a 4–Node ICR Cluster

1:3 Subscriber Redundancy in a 4–Node ICR Cluster

Guidelines for Deploying an ICR Partition in Your Network

Hardware Requirements for ICR

Network Requirements for ICR

Router Configurations for ICR

Interaction with RADIUS for ICR

ICR Partition Accounting Overview

Configuring an ICR Partition

Configuring the Interface on Which the ICR Partition Resides

Configuring VRRP Instances to Match ICR Requirements

Naming ICR Partitions

Grouping ICR Subscribers Based on S-VLAN IDs

Grouping ICR Subscribers Based on VLAN IDs

Example: Configuring ICR Partitions That Group Subscribers by S-VLAN ID

Using RADIUS to Manage Subscribers Logging In to ICR Partitions

Monitoring the Configuration of an ICR Partition Attached to an Interface

Monitoring the Configuration of ICR Partitions

Index

Index