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Best Practices
When you are planning to perform a unified in-service software upgrade (unified ISSU), choose a time when your network is as stable as possible. As with a normal upgrade, Telnet sessions, SNMP, and CLI access are briefly interrupted. In addition, the following restrictions apply:
- The master Routing Engine and backup Routing Engine must be running the same software version before you can perform a unified ISSU.
- During a unified ISSU, you cannot bring any PICs online or offline.
- Unicast RPF-related statistics are not saved across a unified ISSU, and the unicast RPF counters are reset to zero during a unified ISSU.
