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
• Unified ISSU Platform Considerations
• Hardware and Software Requirements Before Beginning a Unified ISSU
• Unified ISSU Terms
• Unified ISSU References
• Unified ISSU Phases Overview
• Unified ISSU Initialization Phase Overview
• Unified ISSU Upgrade Phase Overview
• 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
• Unexpected DHCP Behavior During Unified ISSU
• Unexpected Denial-of-Service Protection Behavior During Unified ISSU
• Unexpected Ethernet Behavior During Unified ISSU
• Unexpected File Transfer Protocol Server Behavior During Unified ISSU
• IS-IS and IS-ISv6 Effects on Graceful Restart and Network Stability During Unified ISSU
• Unexpected L2TP Failover of Established Tunnels During Unified ISSU
• OSPF Effects on Graceful Restart and Network Stability During Unified ISSU
• Unexpected Suspension of PIM During Unified ISSU
• Unexpected Suspension of Subscriber Login and Logouts During Unified ISSU
• 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