how to verify jumbo frames ?

[nflnetwork]

WS-C2960X-24PS-L

How can i verify if a specific port is configured correctly to accept jumbo packets?

CISCO2960stk#
CISCO2960stk#sh int gi1/0/17 switchport
Name: Gi1/0/17
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
CISCO2960stk#

[luis_cordova]

Hi @nflnetwork ,

Check this link:

https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c03384883

It has some information that could be useful to you.

Remember to mark the correct answers as solved, because that helps other users with similar doubts.

Regards

[balaji.bandi]

Adding to other note :

The standard data frame has 1500 MTU size and the jumbo frame is typically set at 9000 MTU value size when enabled.

CISCO2960stk#sh int gi1/0/17   <-- this will show you MTU Size

You do extended ping to test the jumbo MTU by setting df-it. (from Cisco device)

From windows - 

ping -f -l 9000 10.10.10.10  << this destination IP

[Leo Laohoo]

Post the complete output to the command "sh interface <BLAH>" &/or "sh run | i mtu".
If the switch is configured for jumbo frames then the MTU value should be higher than 1500.