I will give an example of increasing MTU on Cisco switches.
Let’s look at the current configuration, the names of the necessary interfaces and go to the configuration mode:
show running-config
configure t
Let’s say that traffic with an MTU of more than 1500 can go between two ports, select the first port and increase the MTU:
interface GigabitEthernet2/24
mtu 9216
Then we increase the MTU on the other port:
interface TenGigabitEthernet3/3
mtu 9216
For example, I indicated the MTU of 9216 bytes, since I had a Cisco 6509E at hand in which you can specify only such an MTU size, to check which size you can specify, run the command:
mtu ?
For example, to test MTU with ping packets, run the command in Linux:
ping -M do -s 8000 192.168.5.5
Don’t forget to increase the MTU on the network interface in Linux:
ifconfig
ifconfig eno1
sudo ifconfig eno1 mtu 9000
See also my article:
Configuring Jumbo Frame on Cisco Nexus 3064