When Jumbo Frames are enabled, the default MTU value settings will be 9192 bytes. The maximum supported MTU is 9216 bytes.
Notes: When enabled, it is applied to all the Data Plane interfaces, including the HA interfaces. It is possible to enable the Jumbo Frames globally with a lower default value of 1500 and then customize the only interfaces needed with a higher MTU as per the business requirement. As a reminder, it is important to configure the switch accordingly.
Details
To enable Jumbo Frame support:
- Navigate to GUI: Device > Setup > Session in the web UI.
- Click Edit for the Session Settings section.
- Enable Jumbo Frame support and specify the Jumbo Frame MTU in this section.
- Commit the changes.
- Reboot the device for this change to take effect.
CLI command to enable jumbo frame:
> set system setting jumbo-frame on
To use Jumbo Frame support on an interface:
- Navigate to the Network tab.
- Select the appropriate interface.
- Set the MTU size for the interface, up to the size specified under Device > Setup > Session.
- Commit the changes.
To disable Jumbo Frame support:
- Uncheck Jumbo frame support from Web UI via Device > Setup > Session > Session Settings.
- If applicable, adjust the MTU size on interfaces that were configured for Jumbo Frame support.
- Commit the changes and reboot the device.
CLI command to disable jumbo frame:
> set system setting jumbo-frame off
To check if the device is enabled for Jumbo Frame support:
- Check ‘Jumbo frame support’ setting from Web UI via Device -> Setup -> Session -> Session Settings.
CLI command to check jumbo frame:
> show system setting jumbo-frame
Device Jumbo-Frame mode: on
Maximum of frame size excluding Ethernet header: 9192
- To view the Jumbo Frame setting at an interface level, use the following CLI command:
> show system state filter-pretty sw.dev.interface.config
sw.dev.interface.config: {
ethernet1/3: {
hwaddr: 00:1b:17:89:94:12,
mtu: 9192,
},
ethernet1/4: {
hwaddr: 00:1b:17:89:94:13,
mtu: 9192,
},
ethernet1/7: {
hwaddr: 00:1b:17:89:94:16,
mtu: 1500,
},
ethernet1/8: {
hwaddr: 00:1b:17:89:94:17,
mtu: 1500,
},
}
3. Jumbo frame mode can also be checked using the following CLI command:
> show system state filter-pretty cfg.jumbo-mode
cfg.jumbo-mode: True