User manual JUNIPER NETWORKS SERVICE AVAILABILITY CONFIGURATION GUIDE V 11.1.X

[. . . ] JUNOSeTM Software for E SeriesTM Broadband Services Routers Service Availability Configuration Guide Release 11. 1. x Juniper Networks, Inc. 1194 North Mathilda Avenue Sunnyvale, California 94089 USA 408-745-2000 www. juniper. net Published: 2010-04-08 Juniper Networks, the Juniper Networks logo, JUNOS, NetScreen, ScreenOS, and Steel-Belted Radius are registered trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners. Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice. [. . . ] If they are not synchronized, forces a synchronization to ensure that all configuration and file system changes are propagated to the standby SRP module before proceeding with the upgrade. Copies the NVS configuration from a backup memory area to the flash card on the standby SRP module. During the initialization phase, this configuration data was mirrored from NVS on the active SRP module and upgraded as required by the armed release. Switches control from the primary SRP module (running the current release) to the standby SRP module (running the armed upgrade release). 6. You can view the status of the router and the progress of the upgrade at any time by issuing the show issu command from another terminal session to the router. 66 Unified ISSU Upgrade Phase Overview Chapter 4: Configuring a Unified In-Service Software Upgrade NOTE: While a unified ISSU operation is in progress, do not remove the SRP modules or attempt to reset them. Removing the SRP modules anytime during unified ISSU has an adverse impact. After the unified ISSU operation is completed, issue the show version command. The output from a successful upgrade indicates the following: The formerly active SRP module has rebooted and come up as the new standby SRP module. The newly active SRP module indicates that the formerly active SRP has rebooted and has come up as standby SRP module You can then remove an SRP module after issuing the halt command. Exceptions During the Upgrade Phase Table 13 on page 67 describes the behavior of the router during the upgrade phase when certain exceptional events take place outside the context of the unified in-service software upgrade. Table 13: Router Response to Undesirable Events During the Upgrade Phase Event The router reloads. The line module is held down and prevented from rebooting until the service restoration phase is completed. The line module then undergoes a cold reboot to the running (post-upgrade) release. The line module undergoes a cold reboot and hot swapping is reenabled when the service restoration phase is completed, The primary SRP module switches over to the standby SRP module. The standby SRP module reloads. A line module reloads. An IOA is hotswapped. Unified ISSU Upgrade Phase Overview 67 JUNOSe 11. 1. x Service Availability Configuration Guide Table 13: Router Response to Undesirable Events During the Upgrade Phase (continued) Event An application that does not support unified ISSU is configured. Router Action This event can take place only before the issu start command is issued, because that command disables CLI configuration commands. When you issue the issu start command, after configuring such an application, the command exits and generates an error message. Verifications of Requirements Because some time may have passed since unified ISSU verified the requirements for the upgrade during the initialization phase, unified ISSU reverifies all the same conditions. Unified ISSU also verifies that no CLI configuration sessions are open, that no scripts or macros are running, and that any SNMP requests or CLI commands in progress complete within 5 seconds. If any of the required conditions are not met, the CLI either exits the command with an error message or provides an informative message and prompts you to proceed or halt. If you continue, then you can subsequently halt the upgrade only by reloading the router. If you exit the command, the router remains in the unified ISSU initialized state. Upgrade Setup At this stage all the preconditions have been met. The unified ISSU process shuts down all management interfaces to the router in order to prevent changes in the configuration. Final preparation for the upgrade phase includes the following actions: SNMP--The SNMP agent generates a juniSystemIssuStateChange trap with juniSystemIssuState set to upgrading to indicate that the final phase of the operation has begun. When the trap is issued with this state value, the SNMP agent stops accepting any new SNMP gets or sets and does not issue any further traps. Only reload, show issu, and show version commands are available to you until the service restoration phase completes. [. . . ] Controls the state of the corresponding subinterfaces (up/AdminDown) based on the state of the partition (master or backup). If the subinterfaces are part of the backup partition, the router changes the state of all the subinterfaces to AdminDown. However, the router does not block VRRP advertisements as long as VRRP is running on a separate interface. If the status is enabled, the router changes the state of the subinterface based on the state of the partition. [. . . ]