Comment 96 for bug 1679823

Bond0 interface doesn't accept MTU higher than 1500.I can set MTU perfectly fine for the slave devices. Recreating the bond0 didn't help to up the MTU.

05:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
05:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

[ 1626.840818] bond0: Invalid MTU 9000 requested, hw max 1500
[ 1668.913497] ixgbe 0000:05:00.0 enp5s0f0: changing MTU from 1500 to 9000
[ 1669.176015] ixgbe 0000:05:00.0 enp5s0f0: speed changed to 0 for port enp5s0f0
[ 1669.237523] ixgbe 0000:05:00.0 enp5s0f0: detected SFP+: 5
[ 1669.487920] ixgbe 0000:05:00.0 enp5s0f0: NIC Link is Up 10 Gbps, Flow Control: RX/TX
[ 1675.591234] ixgbe 0000:05:00.1 enp5s0f1: changing MTU from 1500 to 9000
[ 1675.855232] ixgbe 0000:05:00.1 enp5s0f1: speed changed to 0 for port enp5s0f1
[ 1675.911259] ixgbe 0000:05:00.1 enp5s0f1: detected SFP+: 6
[ 1676.159087] ixgbe 0000:05:00.1 enp5s0f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
[ 1684.745389] bond0: Invalid MTU 9000 requested, hw max 1500

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0

802.3ad info
LACP rate: slow
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: 90:e2:ba:15:68:20
Active Aggregator Info:
        Aggregator ID: 2
        Number of ports: 2
        Actor Key: 13
        Partner Key: 221
        Partner Mac Address: 02:1c:73:b2:9a:29

Slave Interface: enp5s0f0
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 90:e2:ba:15:68:20
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: 90:e2:ba:15:68:20
    port key: 13
    port priority: 255
    port number: 1
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: 02:1c:73:b2:9a:29
    oper key: 221
    port priority: 16000
    port number: 373
    port state: 61

Slave Interface: enp5s0f1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 90:e2:ba:15:68:21
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: 90:e2:ba:15:68:20
    port key: 13
    port priority: 255
    port number: 2
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: 02:1c:73:b2:9a:29
    oper key: 221
    port priority: 17000
    port number: 33141
    port state: 61

Settings for enp5s0f0:
        Supported ports: [ FIBRE ]
        Supported link modes: 1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Advertised link modes: 1000baseT/Full
                                10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Settings for enp5s0f1:
        Supported ports: [ FIBRE ]
        Supported link modes: 1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Advertised link modes: 1000baseT/Full
                                10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes