I have an issue with a pair of 2960s switches. I can see a lot of outdiscards on some of the interfaces and the end users are noticing network issues. I also have some access points that can't download the configuration from the controller because of this.
The interfaces are trunks which are connected to other switches in the other end via multimode fiber 100Mbit. They are configured like this:
interface GigabitEthernet2/0/7 switchport mode trunk speed 100 duplex full
The command show interfaces counters errors:
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards Gi2/0/17 0 899 0 903 0 42443970
I have searched around via different forums and noticed that some says that this issue is because of the incoming traffic is higher than 100Mbit and forces the switch to discards some packets because it can't send them out on the slow interface. Incoming interface is with Gigabit speed.
Is it possible to increase the buffer on the switch for the outgoing traffic or is the only solution to install gigabit traffic on these as well?
Is it the 2960s that is slow or is it not possible to have different speeds in a LAN environment?