SOFTWARE UPGRADE DEPLOYMENT IN MIXED NETWORK OF IN-SERVICE SOFTWARE UPGRADE (ISSU)-CAPABLE AND ISSU-INCAPABLE DEVICES

摘要

Techniques are disclosed for deploying software upgrades to a mixed network of In-Service Software Upgrade (ISSU)-capable and ISSU-incapable network devices without interrupting network traffic serviced by the mixed network. In one example, a centralized controller for a network determines that first network devices of a plurality of network devices for the network are In-Service Software Upgrade (ISSU)-capable and second network devices of the plurality of network devices are not ISSU-capable. The centralized controller transmits messages instructing the first network devices to perform an ISSU operation. Further, the centralized controller transmits messages instructing each network device of the second network devices to transmit a message to peer network devices of the network device, the message indicating that the network device is not ISSU-capable. In response to receiving the message indicating that the network device is not ISSU-capable, the peer network devices redirect traffic to avoid the network device.