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Bug #3922

closed

jumbo frames on lagg not working

Added by Chris Buechler about 10 years ago. Updated about 10 years ago.

Status:
Resolved
Priority:
High
Assignee:
-
Category:
Interfaces
Target version:
2.2
Start date:
10/10/2014
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
2.2
Affected Architecture:

Description

Setting a MTU on a lagg interface greater than the Ethernet interface MTU fails in 2.2. To replicate:
- create a lagg with two NICs (let's say igb2 and igb3)
- assign lagg
- Interfaces>$lagg, enable, set "none", "none" for v4/v6, MTU 9000. Save and apply changes

Check ifconfig and you'll see lagg0, igb2 and igb3 are all at 1500 MTU. If you try to use ifconfig to change the MTU of the lagg or NICs, it results in:

# ifconfig lagg0 mtu 9000
ifconfig: ioctl (set mtu): Invalid argument
# ifconfig igb2 mtu 9000
ifconfig: ioctl (set mtu): Invalid argument

To work around the issue and make it work: 

# ifconfig lagg0 destroy
# ifconfig igb2 mtu 9000
# ifconfig igb3 mtu 9000

Then go to Interfaces>$lagg in the GUI, save and apply changes. The lagg will correctly be 9000 then.

Example system at:
https://172.27.32.125

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