10-16-2008 04:52 AM - edited 03-06-2019 01:57 AM
Now we have tried different images - checked the infrastructure is OK (No crcs etc on the Ethernet port). The file eventually gets copied and the switch boots up ok. But what do these zeros mean? Is it file corruption or something completely different? Peter@it-123.co.uk
10-16-2008 06:07 AM
Hi,
It may be useful.
Look at http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00800a6057.shtml
Massimiliano.
10-16-2008 06:32 AM
I believe the zeros represent lost packets.
[edit]
PS:
Believe tftp will resend lost packets.
10-16-2008 06:34 AM
To check if the image is not corrupted or not :
do "verify flash:
10-16-2008 11:48 AM
Peter,
This should explain it:
http://www.cisco.com/en/US/docs/ios/12_3/configfun/command/reference/cfr_1g02.html#wp1030397
It means packets were received out of order, but it can still succeed. This can be seen in a network with load-balanced links.
Phil Leinster
CCIE #21467
11-05-2020 07:01 PM
Used my desktop Win10, tftpd64. I deleted the current IOS on 3560, then did a tftp and got !OO!OO!OO!OO!OO!OO!OOO!OO!... [timed out].
I tried changing the tftpd64 settings, timeout 6 & retransmit 10 (like others suggested, it didn't help).
3560 doesn't have the command "ip tftp block-size xxxx"
The solution for me was to use another tftp server and program, I used my Solarwinds server with Solarwinds tftp and it was all good (but it took a long time). I know it is best to do it on a local pc, but I don't have that option, I'm doing the tftp over a WAN link.
-----------------------------------------------------------------------------------------
WS-C3560V2-48PS#delete /recursive /force flash:c3560-ipbasek9-mz.122-55.SE12.bin
WS-C3560V2-48PS#dir
Directory of flash:/
2 -rwx 796 Aug 30 2017 15:17:17 -05:00 vlan.dat
3 -rwx 5511 Sep 21 2020 17:32:19 -05:00 private-config.text
5 -rwx 4120 Sep 21 2020 17:32:19 -05:00 multiple-fs
6 drwx 512 May 1 1993 13:39:31 -05:00 crashinfo_ext
8 -rwx 64627 Sep 21 2020 17:32:18 -05:00 config.text
WS-C3560V2-48PS#copy tftp://10.10.10.247/c3560-ipbasek9-mz.150-2.SE11.bin flash:c3560-ipbasek9-mz.150-2.SE11.bin
Destination filename [c3560-ipbasek9-mz.150-2.SE11.bin]?
Accessing tftp://10.10.15.247/c3560-ipbasek9-mz.150-2.SE11.bin...
Loading c3560-ipbasek9-mz.150-2.SE11.bin from 10.10.15.247 (via Vlan10): !OO!OO!OO!OO!OO!OO!OOO!OO!... [timed out]
WS-C3560V2-48PS#copy tftp://10.10.10.100/c3560-ipbasek9-mz.150-2.SE11.bin flash:c3560-ipbasek9-mz.150-2.SE11.bin
Destination filename [c3560-ipbasek9-mz.150-2.SE11.bin]?
Accessing tftp://10.10.18.100/c3560-ipbasek9-mz.150-2.SE11.bin...
Loading c3560-ipbasek9-mz.150-2.SE11.bin from 10.10.18.100 (via Vlan10): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!
[OK - 16664448 bytes]
16664448 bytes copied in 1200.217 secs (13885 bytes/sec)
WS-C3560V2-48PS#verify /md5 flash:c3560-ipbasek9-mz.150-2.SE11.bin
.........................................................................................................................................................................Done!
verify /md5 (flash:c3560-ipbasek9-mz.150-2.SE11.bin) = b81d9bfd47be75d966d122af60003fef
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