Hi everybody.
I have pretty strange problem with upgrading XOS to 15.6 on Summit x480. I can't download 15.6 firmware from TFTP server, but I can do it with 15.4 and 15.5 versions. Some cli output bellow.
Current State: OPERATIONAL
Image Selected: secondary
Image Booted: secondary
Primary ver: 15.4.1.3
Secondary ver: 15.5.2.9
patch1-5
sh version images
Card Partition Installation Date Version Name Branch
------------------------------------------------------------------------------
Switch primary Mon Aug 4 17:08:03 UTC 2014 15.4.1.3 summitX-15.4.1.3-patch1-1.xos v1541b3-patch1-1
Switch primary Mon Aug 4 17:13:19 UTC 2014 15.4.1.3 summitX-15.4.1.3-patch1-1-ssh.xmod v1541b3-patch1-1
Switch secondary Wed Feb 4 20:26:52 UTC 2015 15.5.2.9 summitX-15.5.2.9-patch1-5.xos v1552b9-patch1-5
ping vr "VR-Default" 172.30.0.240
Ping(ICMP) 172.30.0.240: 4 packets, 8 data bytes, interval 1 second(s).
16 bytes from 172.30.0.240: icmp_seq=0 ttl=127 time=0.934 ms
16 bytes from 172.30.0.240: icmp_seq=1 ttl=127 time=0.938 ms
16 bytes from 172.30.0.240: icmp_seq=2 ttl=127 time=1.398 ms
16 bytes from 172.30.0.240: icmp_seq=3 ttl=127 time=5.072 ms
download image 172.30.0.240 summitX-15.6.1.4.xos "VR-Default" primary
Do you want to install image after downloading? (y - yes, n - no, - cancel) Yes
Downloading to Switch...............................................................................................
Error: Failed to download image - tftp: write error
download image 172.30.0.240 summitX-15.5.2.9-patch1-5.xos "VR-Default" primary
Do you want to install image after downloading? (y - yes, n - no, - cancel) Yes
Downloading to Switch..............................................................................................................
Installing to primary partition!
Installing to Switch.......................................................................................................................I really have no idea about it.