In-Service Software Upgrade (ISSU)
Definition - What does In-Service Software Upgrade (ISSU) mean?
An in-service software upgrade (ISSU) is a process through which networking devices and firmware can be patched or upgraded without interrupting the underlying device/equipment’s operations. ISSU is a method for updating a networking device without the need to stop its ongoing processes and restart, which degrades overall network services.
Techopedia explains In-Service Software Upgrade (ISSU)
ISSU is primarily used to ensure maximum network availability with minimal downtime as a result of device maintenance or upgrade processes. ISSU was initially introduced by Cisco Systems for updating and upgrading their suite of networking devices. For the ISSU to work, the networking/equipment must have a redundant route processor (RP) within its core architecture. This way, when updating, the upgrade process can be mapped onto a parallel RP and the routine operations/services can be performed from another RP. For example, some Cisco routers and switches are integrated with active and standby route processors. When the upgrade/patching process starts, the active RP's operations are switched to the standby RP until the upgrade process is complete.
7 Tips For Selecting an Enterprise Mobile Device Management Solution
Join thousands of others with our weekly newsletter
The 4th Era of IT Infrastructure: Superconverged Systems:
Approaches and Benefits of Network Virtualization:
Free E-Book: Public Cloud Guide:
Free Tool: Virtual Health Monitor:
Free 30 Day Trial – Turbonomic: