Unexpected Suspension Of Pim During Unified Issu; Unexpected Suspension Of Subscriber Login And Logouts During Unified Issu; Subscriber Statistics Accumulation Or Deletion - Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x Service Availability Configuration Guide
When traffic engineering has been configured, the traffic engineering metrics are
also increased. New tunnels are not established through the upgrading router and
any tunnels undergoing re-optimization in other routers go around the upgrading
router.
OSPF support for unified ISSU does not depend on this configuration. If you do not
issue the overload advertise-high-metric issu command, the unified in-service
software upgrade can still proceed to successful completion without disrupting OSPF
functionality.
Related Topics

Unexpected Suspension of PIM During Unified ISSU

You can minimize PIM traffic loss during the unified in-service software upgrade by
issuing the ip pim dr-priority command to set a priority so that PIM neighbors do
not forward traffic through the upgrading router. By default, a PIM interface has a
priority of one. If you set the priority to one, the lowest possible priority, then the
upgrading router is not selected to be a designated router in the PIM network if an
interface on another router in that network has a higher priority.
Related Topics

Unexpected Suspension of Subscriber Login and Logouts During Unified ISSU

All new subscriber logins are ignored during the upgrade phase. New subscriber
logouts are cached and processed after the unified ISSU operation is completed.

Subscriber Statistics Accumulation or Deletion

All subscriber statistics present in the line modules are cleared when the line module
forwarding planes are upgraded. For this reason, the router has to read the statistics
from the forwarding plane before it is upgraded.
However, forwarding through the line modules continues after that point, until the
line module forwarding plane is upgraded. Some statistics can therefore accumulate
in the forwarding plane in the interval between these two events. These statistics
are not preserved across the upgrade.
Statistics for subscribers that log out during the forwarding plane upgrade are collected
and reported before the forwarding plane is reloaded. Statistics are not collected for
any subscribers who are connected before you issue the issu start command but
who log out before the forwarding plane upgrade is completed.
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Unexpected Suspension of PIM During Unified ISSU
Application Support for Unified ISSU on page 71
overload advertise-high-metric issu
issu start
Application Support for Unified ISSU on page 71
ip pim dr-priority