Unified Issu Terms; Table 18: Unified Issu-Related Terms - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

JunosE 11.3.x Service Availability Configuration Guide
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Unified ISSU Terms

106
See "Managing Stateful SRP Switchover" on page 35 for information about high
availability.
The following requirements must be met for traffic forwarding to continue. However,
failing to meet these requirements does not halt the unified ISSU operation. The unified
ISSU process offers the option to override or ignore these forwarding requirements.
Graceful restart must be enabled for all configured routing protocols. The unified ISSU
operation relies on graceful restart to keep the routing protocols alive through the
various stages of the upgrade.
All connected peers must be configured with graceful restart. Because some protocols
cannot themselves confirm peer configuration for graceful restart, you must ensure
that the peers are properly configured.
For applications that exchange keepalive messages with peers, you must ensure that
the poll times are adequate to maintain the peering session across any forwarding
interruption caused by the unified ISSU operation.
On the ERX1440 router, you must enter the key provided with your license in order to
make the unified ISSU CLI commands available. Unified ISSU is licensed on only the
ERX1440 router; no license is required or available on the E120 and E320 routers.
The license issu command is available only on the ERX1440 CLI.
Application Support for Unified ISSU on page 115
Application Support for Stateful SRP Switchover on page 42
Activating High Availability on page 52
license issu
show issu
Table 18 on page 106 defines terms relevant to module behavior during a unified in-service
software upgrade.

Table 18: Unified ISSU-Related Terms

Term Meaning
Cold boot The SRP module or line module loads diagnostics from the flash file
system and runs them. When the diagnostics successfully complete,
the operational image is loaded from the flash file system and then
cold started.
Cold start The SRP module or line module is initialized from the loaded operational
image. The line modules are reloaded and the configuration is read
from flash memory. When the line modules are operational, their
configuration data is bulk downloaded and their interfaces become
operational.
Copyright © 2010, Juniper Networks, Inc.