02-21-2017 03:03 AM - edited 03-08-2019 09:25 AM
Hi!
I've discoverd a strange behaviour. Either it's a bug, or an urgent required upgrade of my knowledges.
C2960+ 24TC-L / 15.0(2) SE6
Here is the symptoms observed:
. If i try to export the startup config to a TFTP server located in a distinct vlan and subnet, the copy operates, and then the C2960+ management interface loses all further connectivity to this TFTP server (a reboot is reqired).
Do notice:. The C2960+ interface does not get down
. The 2960+ can still access any IP in any VLAN, except the TFTP server
. I've port-mirrored and wiresharked all over the topology, the C2960+ is the faulty one
. Everything is functioning OK when the TFTP server is in the same Vlan/Subnet that the C2960+
.
It's like at the end of the TFTP transfert, the C2960+ somehow decides that this particular TFTP server IP must be place in a strange black-hole route: No more packets sent by the C2960+, no arp request, no debug message, nothing ....
It's a layer2 switch, I can't list any routing datas.
Any thoughts about all this ?! :-)
02-21-2017 03:39 AM
sounds like a bug as a test does the same symptoms happen if you use FTP or SCP as a test to see if its isolated to TFTP ?
02-21-2017 03:48 AM
Hi
Have you verified the reachability to the TFTP from other switch on the same vlan, is the TFTP a standalone server or is a computer connected to wifi or using wired? As Mark mentioned, is the same behavior with FTP or SCP? Have you tried other TFTP software?
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