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

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 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

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 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

Table of Contents