Symptom
Nexus 3000 may fail to upgrade with 7.0(x) images with MD5Sum mismatch error
Conditions
Only following platforms are susceptible to this issue
N3K-C3064PQ-10GX
N3K-C3132Q-40GX
N3K-C3172TQ-10GT
N3K-C3172PQ-10GE
N3K-C3048TP-1GE
Also, this issue is seen only when the switch is upgrading from 6.x to 7.x
• e-USB needs to have a disk geometry of greater than 48 sectors/track as below
N3K(config)# run bash fdisk -l /dev/sda | grep sectors
161 heads, 63 sectors/track, 1038 cylinders
Workaround
In order to recover this device, tftp boot the image from loader prompt to 7.x image first and then downgrade to 6.x
1) break into loader prompt by Ctrl-L if the switch is in boot cycle
2) set ip ipaddress netmask
3) set gw gateway_ipaddress
4) boot tftp://tftp_server_ip/nxos.7.0.3.Ix.y.bin (boot 7.0.x release via tftp boot from loader)
5) write erase
6) write erase boot
7) copy _config startup-config
8) install all kickstart bootflash:n3000-uk9-kickstart.6.0.2.U6.x.bin system bootflash:n3000-uk9.6.0.2.U6.x.bin no-save bios-force (downgrade to 6.0.(2)U6(x))
Further Problem Description
This is not a hardware issue.
http://www.cisco.com/c/en/us/support/docs/field-notices/642/fn64233.html
