10-24-2018 04:31 AM - edited 03-08-2019 04:27 PM
Hi all,
I have a stack of 3850 made by 1 switch full multigigabit copper interface and 1 switch full 1Gb copper interface.
My server are connected to 10GB interface.
I have the following problem: If I connect any host with 1GB nic to a 10GB RJ-45 port, it correctly negotiates 1GB interface but download from the server is very slow. I also tried to force the 10G interface to fixed 1G but nothing changes.
If I connect the same host to a 1GB native port of the same stack, download is perfect.
Both the port 10G and 1G are configured same way:
switchport mode access
switchport access vlan 100
spanning-tre portfast
this happens with any computer with 1 GB Nic. (OS W8.1 or W10 or Server2012R2).
As I have a backup stack perfectly equal to the one I'm testing, I tried the same tests even in the second stack. the result is the same: download very slow if I connect to a 10G interface (negotiated to 1 G) and dowbload perfect if I connect to a native 1G interface of the same stack).
Any idea?
Tks for support.
Johnny
10-24-2018 02:33 PM
10-30-2018 08:36 AM
It depends.
In some test I can find output drops, in other test I can't see any drop.
I Have an open cisco TAC case on this situation. They didn't find any configuration error nor any evident hardware problem.
They took my config file in order to try to reproduce the situation in their lab.
10-30-2018 02:16 PM
10-31-2018 02:07 AM
16.3.7
Same problem I had with 16.3.6
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