Supported Platforms
Related Documentation
- QFX Series standalone switches
- Understanding In-Service Software Upgrade (ISSU)
- Performing an In-Service Software Upgrade (ISSU)
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:
| Junos OS 13.2X51-D15 and later |
Related Documentation
- QFX Series standalone switches
- Understanding In-Service Software Upgrade (ISSU)
- Performing an In-Service Software Upgrade (ISSU)
Published: 2014-07-23
Supported Platforms
Related Documentation
- QFX Series standalone switches
- Understanding In-Service Software Upgrade (ISSU)
- Performing an In-Service Software Upgrade (ISSU)