Good afternoon:

I have a redhat 7.4 and I have created a bonding with two interfaces that are configured by VLAN_ID, since several VLANs pass through there and I have to "tagging".

The problem is that I need to change the MTU to 9000 and it gives me an out of range error. I have put the parameter in the interfaces and in the bonding, but they do not raise them. The Bonding appears with MTU 9000, but it does not raise it and also the interfaces that are part of Bonding. And the physical interfaces follow MTU 1500.

I have been reading that with interfaces configured with VLANes it can not be done, but I find it super weird that it can not be done.

Can you help me?

Thanks and best regards

Could you post your configuration for the ports? Would help seeing what you are trying to do from a configuration standpoint.

[root@XXXXXXXXX network-scripts]# cat ifcfg-bondHB521

##################Bonding de RAC. VLAN InterConnect

DEVICE=bondHB521

TYPE=Bond

BOOTPROTO=none

BONDING_MASTER=yes

ONBOOT=yes

DEFROUTE=no

name=bondHB521

IPADDR=172.XXX.XXX.XXX

PREFIX=28

[root@XXXXXXXXX network-scripts]# cat ifcfg-em3_2.521

############## Red de RAC. VLAN InterConnect

TYPE=Vlan

VLAN=yes

PHYSDEV=em3_2

VLAN_ID=521

PROXY_METHOD=none

BROWSER_ONLY=no

IPV4_FAILURE_FATAL=no

NAME=em3_2.521

UUID=bae51585-93c1-4ab3-9ed9-f1261b2f8f91

ONBOOT=yes

MASTER=bondHB521

SLAVE=yes


[root@XXXXXXXXX network-scripts]# cat ifcfg-em4_2.521

############## Red de RAC. VLAN InterConnect

TYPE=Vlan

VLAN=yes

PHYSDEV=em4_2

VLAN_ID=521

PROXY_METHOD=none

BROWSER_ONLY=no

IPV4_FAILURE_FATAL=no

NAME=em4_2.521

UUID=dd956a5b-bc80-4d80-b44a-6069a69cc128

ONBOOT=yes

MASTER=bondHB521

SLAVE=yes

OK, your VLAN tagging should be done on the Bond interface as that is the only interface that counts for the connection. Where are you setting the MTU's at? can you show your command and where you are placing it?

I put the variable MTU = 9000 in both interfaces and in the bonding and it did not work.

Then I did it with "nmcli" changing the 802-3-ethernet.mtu to 9000, but it did not work either. Give the same error in both cases: out of range.

Thank you

ok try this command and share

Lets see if you can set it from the command line.

I had already tried :-(

# ip link show dev bondHB525
26: bondHB525: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT qlen 1000
link/ether 54:48:10:1b:e3:53 brd ff:ff:ff:ff:ff:ff


# ip link set mtu 9000 dev bondHB525
RTNETLINK answers: Numerical result out of range

Several VLANs pass through each physical interface. It is possible that this is the problem.

I'm not finding anything on the web for this that matches what you are experiencing.