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Chapter 4
Configuring a Unified In-Service Software
Upgrade
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 58
Unified ISSU Platform Considerations on page 59
Unified ISSU Terms on page 62
Unified ISSU References on page 62
Unified ISSU Phases Overview on page 63
Unified ISSU Initialization Phase Overview on page 63
Unified ISSU Upgrade Phase Overview on page 66
Application Support for Unified ISSU on page 71
ISSU on page 80
Unexpected ATM Behavior During Unified ISSU on page 80
Unexpected DHCP Behavior During Unified ISSU on page 81
Unexpected Denial-of-Service Protection Behavior During Unified ISSU on page 81
Unexpected Ethernet Behavior During Unified ISSU on page 82
Unexpected File Transfer Protocol Server Behavior During Unified
ISSU on page 83
IS-IS Effects on Graceful Restart and Network Stability During Unified
ISSU on page 86
Unexpected L2TP Failover of Established Tunnels During Unified ISSU on page 87
OSPF Effects on Graceful Restart and Network Stability During Unified
ISSU on page 88
Unexpected Suspension of PIM During Unified ISSU on page 90
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