Unexpected Sonet And Sdh Behavior During Unified Issu; Unexpected T3 Behavior During Unified Issu - Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual

The following subscriber statistics are preserved across the upgrade:
All other statistics are set to zero, including all statistics belonging to the SNMP generic
interface MIB for every interface layer.
Related Topics

Unexpected SONET and SDH Behavior During Unified ISSU

During a unified in-service software upgrade, several aspects of SONET behavior
differ from normal operation.
NOTE: The unified ISSU process for the channelized APS IOAs has not been modified.
The channelized APS IOAs are rebooted during a unified in-service software upgrade.
Related Topics

Unexpected T3 Behavior During Unified ISSU

Local T3 (DS3) devices are reprogrammed during a unified in-service software
upgrade, generating a defect. The router completes the reprogramming within 2.5
seconds. Because JUNOSe DS3 applications declare an alarm and bring down the
All policy statistics
Accounting statistics reported by IP: in bytes, out bytes, in packets, out packets
Accounting statistics reported by L2TP: in octets, out octets, in packets, out
packets
Accounting statistics reported by PPP: in octets, out octets, in packets, out packets
Application Support for Unified ISSU on page 71
SONET APS is supported only for non-channelized APS IOAs.
During a unified in-service software upgrade, if you have configured APS
functionality on the non-channelized APS IOAs, the unified ISSU process fails
and a warning message is displayed. If you have not configured APS functionality,
the unified ISSU process succeeds and the line modules (OC3/OC12) do not get
rebooted.
During a conventional software upgrade, a SONET loss-of-signal defect lasts more
than 2.5 seconds, causing the router to declare an LOS failure. Devices on the
remote end of SONET links detect the failure and bring down the link and the
dynamic interface stacks built on the link.
During a unified in-service software upgrade, the LOS does not last more than
2.5 seconds. The remote device detect a momentary LOS but does not perceive
this short LOS as a link failure and does not bring the link down,
Application Support for Unified ISSU on page 71
Unexpected SONET and SDH Behavior During Unified ISSU
Chapter 4: Configuring a Unified In-Service Software Upgrade
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