Table of Contents

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
Chapters
Service Availability
Service Availability Overview
Service Availability Versus High Availability
Understanding Service Availability Features
Module Redundancy
Stateful SRP Switchover
Stateful Line Module Switchover
Unified ISSU
VRRP
Interchassis Redundancy
Managing Module Redundancy
Line Module Redundancy Overview
Line Module Redundancy Requirements
ERX7xx Models and ERX14xx Models
E120 and E320 Routers
IOA Behavior When the Router Reboots
Line Module Behavior When Disabling or Enabling IOAs
Understanding Automatic Switchover
Limitations of Automatic Switchover
Understanding Reversion After Switchover
Configuring Line Module Redundancy
Managing Line Module Redundancy
Example: Forcing the Router to Switch from Primary Line Module to Spare Line Module
Interoperation of Redundancy and Stateful Switchover for Line Modules
Understanding SRP Module Redundancy
Understanding Configuration of SRP Modules for Redundancy
Installing a Redundant SRP Module
Managing SRP Module Redundancy
Switching to the Redundant SRP Module
Determination of Redundancy Status for Line Modules and SRP Modules Using Status LEDs
Monitoring Redundancy in Installed Hardware
Monitoring Redundancy in Line Module and SRP Modules
Monitoring Redundancy Status on E320 Router
Managing Stateful SRP Switchover
Stateful SRP Switchover Overview
Stateful SRP Switchover Platform Considerations
Module Requirements
Stateful SRP Switchover Redundancy Modes
File System Synchronization Mode
High Availability Mode
Stateful SRP Switchover States
Disabled State
Initializing State
Active State
Pending State
Application Support for Stateful SRP Switchover
Application Support
Preservation of DHCP Proxy Client Bindings During Stateful SRP Switchover
Restoration of Client Bindings from Mirrored Storage
Guidelines for Activating High Availability
Activating High Availability
Guidelines for Deactivating High Availability
Deactivating High Availability
Guidelines for Setting the IP Interface Priority
Setting the IP Interface Priority
Guidelines for Upgrading Software
Monitoring the Redundancy Status
Monitoring the Redundancy Status of Applications
Monitoring the Redundancy History
Monitoring the Redundancy Status of Line Modules
Monitoring the Redundancy Status of SRP Modules
Monitoring the Redundancy Switchover History
Clearing the Redundancy History
Managing Stateful Line Module Switchover
Stateful Line Module Switchover Overview
Benefits of Stateful Line Module Switchover
1:1 Redundancy Model
Seamless Preservation of Subscriber Sessions
Stateful Line Module Switchover Platform Considerations
Guidelines for Configuring Stateful Line Module Switchover
System Operations When Stateful Line Module Switchover Is Enabled
Stateful Line Module Configuration Scenarios
High Availability Configured and Enabled on the Line Module
High Availability Configured and Disabled on the Line Module
High Availability Configured and the Switchover State Is Active or Disabled
Rebooting of the System When Line Module High Availability Is Configured
Stateful SRP Switchover
Line Module Redundancy
Unified ISSU
Simultaneous Stateful Line Module Switchover and Stateful SRP Switchover
Replacement of Line Modules When Stateful Line Module Switchover Is Enabled
Reloading the Primary Line Module in Response to Failures
Reloading the Secondary Line Module in Response to Failures
Disabling the Primary and Secondary Line Module Slots
Replacing Line modules Without Erasing the Slot Configuration
Reloading the Router When Line Modules Enabled for HA Are Installed
Removing IOAs Without Powering Down from Line Modules
Cold and Warm Switchovers of Line Modules In a High Availability Pair
Application Support for Stateful Line Module Switchover
Policy Management
QoS
Connection Manager and Queue Manager
PPP
L2TP
Forwarding Controller
Mirroring Subsystem
Unified ISSU
ICCP
Stateful Line Module Switchover Modes
Stateless Switchover Mode
High Availability Mode
Stateful Line Module Switchover States
Disabled State
Initializing State
Active State
Guidelines for Activating High Availability
Activating High Availability
Guidelines for Deactivating High Availability
Deactivating High Availability
Switching Over from a Primary Line Module to Secondary Line Module
Log Messages Generated for Stateful LM Switchover
Log Messages Displayed During the Transition from Disabled State to Active State
Log Messages Displayed During the Transition from Active State to Pending or Disabled State
Log Messages Displayed During the Transition from Pending or Disabled State to Active State
Log Messages Displayed During the Transition from Active or Pending State to Disabled State
Log Messages Displayed for Stateful SRP and Line Module Switchover When HA Is Enabled
Log Messages Displayed for Stateful SRP and Line Module Switchover When HA Is Disabled
Preservation of Statistics During Stateful Line Module Switchover
PPP Accounting Statistics
Policy Statistics
Performance Impact and Scalability Considerations
Use of Status LEDs to Monitor the High Availability States of Line Modules
Monitoring the Redundancy Status of Line Modules in a Specific Slot
Monitoring the Redundancy History of Line Modules in a Specific Slot
Configuring a Unified In-Service Software Upgrade
Unified ISSU Overview
Router Behavior During a Unified In-Service Software Upgrade
Unified ISSU Platform Considerations
Hardware and Software Requirements Before Beginning a Unified ISSU
Hardware Requirements for Unified ISSU
Software Requirements for Unified ISSU
Unified ISSU Terms
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
Verifications 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
IPv6 Behavior During Unified ISSU
IPv6 BGP Behavior During Unified ISSU
Application Support for Unified ISSU
Unexpected AAA Authentication and Authorization Behavior During Unified ISSU
Unexpected ATM Behavior During Unified ISSU
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
Unexpected DHCP Behavior During Unified ISSU
DHCP Packet Capture Halted on Line Modules
Unexpected Denial-of-Service Protection Behavior During Unified ISSU
Unexpected Ethernet Behavior During Unified ISSU
ARP Packets Briefly Not Sent or Received
Link Aggregation Interruption
Port Data Rate Monitoring Halted
VLAN Statistics Monitoring Halts Unified ISSU Progress
Unexpected File Transfer Protocol Server Behavior During Unified ISSU
IS-IS and IS-ISv6 Effects on Graceful Restart and Network Stability During Unified ISSU
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
Unexpected L2TP Failover of Established Tunnels During Unified ISSU
Unexpected Termination of L2TP Tunnels after Unified ISSU
Unexpected L2TP Subscriber Termination During Unified ISSU Because of OSPF Interface Cost Configuration
Unexpected IGP–L2TP Subscriber Termination During Unified ISSU
OSPF Effects on Graceful Restart and Network Stability During Unified ISSU
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
Unexpected Suspension of PIM During Unified ISSU
Unexpected Suspension of Subscriber Login and Logouts During Unified ISSU
Subscriber Statistics Accumulation or Deletion
Unexpected SONET and SDH Behavior During Unified ISSU
Unexpected T3 Behavior During Unified ISSU
Unavailability of TACACS+ Services During Unified ISSU
Interruption in Traffic Forwarding for Layer 3 Routing Protocols During Unified ISSU
Recommended Settings for Routing Protocol Timers During Unified ISSU
Upgrading Router Software with Unified ISSU
Halt of Unified ISSU During Initialization Phase Overview
Halting Unified ISSU During Initialization Phase
Halt of Unified ISSU During Upgrade Phase Overview
Halting Unified ISSU During Upgrade Phase
Monitoring the Status of the Router During Unified ISSU
Configuring VRRP
VRRP Overview
VRRP Platform Considerations
VRRP Terms
VRRP References
VRRP Implementation in E Series Routers
VRRP Router Election Rules
Example: Basic VRRP Configuration
Example: Commonly Used VRRP Configuration
Example: VRRP Configuration Without the Real Address Owner
Before You Configure VRRP
Configuring VRRP
Changing the Object Priority
Monitoring the Configuration of VRIDs
Monitoring the Configuration of VRRP Neighbors
Monitoring the Statistics of VRRP Routers
Monitoring the Configuration of VRRP Tracked Objects
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
Interaction with RADIUS for ICR
ICR Partition Accounting Overview
Configuring ICR Partitions
Configuring the Interface on Which ICR Partitions Reside
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