Cisco Bug: CSCvs18851 - Router goes into a continuous boot-loop when downgraded from newer to older versions.
Jul 16, 2020
- Cisco ASR 920 Series Aggregation Services Router
Known Affected Releases
16.12.2 16.9.4 17.1.1
Symptom: When downgrading routers from 17.1.1, 16.12.2, 16.9.4 etc to older releases such as 3.18 SP, 3.16 SP etc. Router is going into a continuous boot-loop. Conditions: Following logs will be displayed during bootup : FPGA UPGRADE Done: System going for reboot System Bootstrap, Version 15.6(10r)S, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 2016 by cisco Systems, Inc. Compiled Thu 24-Mar-16 15:38 by alnguyen Boot ROM1 Last reset cause: PowerOn UEA platform with 3670016 Kbytes of main memory
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.
Bug Details Include
- Full Description (including symptoms, conditions and workarounds)
- Known Fixed Releases
- Related Community Discussions
- Number of Related Support Cases