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In-Service Software Upgrade (ISSU) System Requirements

To perform an in-service software upgrade (ISSU), your device must be running Junos OS Release 13.2X51-D15 or later.

Note: ISSU does not support extension application packages developed with the Junos SDK.

Video 1: How Does ISSU Work on the QFX5100?

In-Service Software Upgrade (ISSU) Protocol and Process Support

Table 1 lists the protocols and processes that are supported during an ISSU. Protocols that are not supported might cause packet loss.

Table 1: ISSU Protocol Support

Protocol

Junos OS Release

Graceful Routing Engine switchover (GRES)

Junos OS 13.2X51-D15 and later

Internet Group Management Protocol (IGMP)

Junos OS 13.2X51-D15 and later

Layer 2 MAC routes

Junos OS 13.2X51-D15 and later

Layer 3 unicast and multicast routes

Junos OS 13.2X51-D15 and later

Layer 2 multicast routes

Junos OS 13.2X51-D15 and later

Link Aggregation Control Protocol (LACP)

Note: Configure LACP before you issue an ISSU.

The LACP periodic fast mode is not supported. Instead, configure the periodic slow mode. If you configure the periodic fast mode, the configuration can be committed without any commit or system log error messages, but you might experience a larger than expected amount of traffic drops. Traffic drops occur because the LACP links go down during an ISSU.

Link changes are processed after an ISSU is complete.

Junos OS 13.2X51-D15 and later

Multicast Listener Discovery (MLD) snooping

Junos OS 13.2X51-D15 and later

Nonstop bridging

Junos OS 13.2X51-D15 and later

Nonstop active routing

Junos OS 13.2X51-D15 and later

Spanning tree protocols:

  • Multiple Spanning Tree Protocol (MSTP)
  • Rapid Spanning Tree Protocol (RSTP)
  • Spanning Tree Protocol (STP)
  • VLAN Spanning Tree Protocol (VSTP)

Junos OS 13.2X51-D15 and later

Published: 2014-07-23