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CHAPTER 5
Configuring a Unified In-Service Software
Upgrade
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to prepare for and perform a unified in-service software
upgrade (unified ISSU) of JunosE Software on E120 and E320 Broadband Services Routers.
A unified in-service software upgrade provides a way to upgrade to a higher-numbered
release while minimizing the effect of the upgrade on traffic forwarded through the router.
Unified ISSU Overview on page 102
Unified ISSU Platform Considerations on page 104
Hardware and Software Requirements Before Beginning a Unified ISSU on page 104
Unified ISSU Terms on page 106
Unified ISSU References on page 107
Unified ISSU Phases Overview on page 107
Unified ISSU Initialization Phase Overview on page 108
Unified ISSU Upgrade Phase Overview on page 110
Unified ISSU Service Restoration Phase Overview on page 115
Application Support for Unified ISSU on page 115
Unexpected AAA Authentication and Authorization Behavior During Unified
ISSU on page 124
Unexpected ATM Behavior During Unified ISSU on page 124
Unexpected DHCP Behavior During Unified ISSU on page 125
Unexpected Denial-of-Service Protection Behavior During Unified ISSU on page 125
Unexpected Ethernet Behavior During Unified ISSU on page 126
Unexpected File Transfer Protocol Server Behavior During Unified ISSU on page 127
IS-IS Effects on Graceful Restart and Network Stability During Unified ISSU on page 129
Unexpected L2TP Failover of Established Tunnels During Unified ISSU on page 131
OSPF Effects on Graceful Restart and Network Stability During Unified ISSU on page 132
Unexpected Suspension of PIM During Unified ISSU on page 133
Unexpected Suspension of Subscriber Login and Logouts During Unified ISSU on page 134
Unexpected SONET and SDH Behavior During Unified ISSU on page 134
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