Just to put in my experience. Installed single system with SH engine in 3.6.0 and CentOS 7.1. Then updated to oVirt 3.6.1 and CentOS 7.2. I never had problems regarding bonding neither in 3.6.0 nor in 3.6.1. My current kernel is 3.10.0-327.3.1.el7.x86_64 The server hw is a blade PowerEdge M910 with 4 Gigabit adapters [root@ractor ~]# lspci | grep igab 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet (rev 20) 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet (rev 20) 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet (rev 20) 02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet (rev 20) They are connected to Cisco switches with ports configured as 802.3ad (I have no details at hand for Cisco model but I can verify) And this is the situation for VM bonding, where I only customized mode=4 to specify lacp_rate=1 (default is slow) - bridges [root@ractor ~]# brctl show bridge name bridge id STP enabled interfaces ;vdsmdummy; 8000.000000000000 no ovirtmgmt 8000.002564ff0bf4 no bond1 vnet0 vlan65 8000.002564ff0bf0 no bond0.65 vnet1 vnet2 - bond device for VMs vlans [root@ractor ~]# cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) Bonding Mode: IEEE 802.3ad Dynamic link aggregation Transmit Hash Policy: layer2 (0) MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 802.3ad info LACP rate: fast Min links: 0 Aggregator selection policy (ad_select): stable Active Aggregator Info: Aggregator ID: 1 Number of ports: 2 Actor Key: 9 Partner Key: 8 Partner Mac Address: 00:01:02:03:04:0c Slave Interface: em1 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:25:64:ff:0b:f0 Slave queue ID: 0 Aggregator ID: 1 Actor Churn State: none Partner Churn State: none Actor Churned Count: 0 Partner Churned Count: 0 details actor lacp pdu: system priority: 65535 port key: 9 port priority: 255 port number: 1 port state: 63 details partner lacp pdu: system priority: 32768 oper key: 8 port priority: 32768 port number: 137 port state: 63 Slave Interface: em2 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:25:64:ff:0b:f2 Slave queue ID: 0 Aggregator ID: 1 Actor Churn State: none Partner Churn State: none Actor Churned Count: 0 Partner Churned Count: 0 details actor lacp pdu: system priority: 65535 port key: 9 port priority: 255 port number: 2 port state: 63 details partner lacp pdu: system priority: 32768 oper key: 8 port priority: 32768 port number: 603 port state: 63 - bond device for ovirtmgmt [root@ractor ~]# cat /proc/net/bonding/bond1 Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) Bonding Mode: IEEE 802.3ad Dynamic link aggregation Transmit Hash Policy: layer2 (0) MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 802.3ad info LACP rate: fast Min links: 0 Aggregator selection policy (ad_select): stable Active Aggregator Info: Aggregator ID: 1 Number of ports: 2 Actor Key: 9 Partner Key: 16 Partner Mac Address: 00:01:02:03:04:0c Slave Interface: em3 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:25:64:ff:0b:f4 Slave queue ID: 0 Aggregator ID: 1 Actor Churn State: none Partner Churn State: none Actor Churned Count: 0 Partner Churned Count: 0 details actor lacp pdu: system priority: 65535 port key: 9 port priority: 255 port number: 1 port state: 63 details partner lacp pdu: system priority: 32768 oper key: 16 port priority: 32768 port number: 145 port state: 63 Slave Interface: em4 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:25:64:ff:0b:f6 Slave queue ID: 0 Aggregator ID: 1 Actor Churn State: none Partner Churn State: none Actor Churned Count: 0 Partner Churned Count: 0 details actor lacp pdu: system priority: 65535 port key: 9 port priority: 255 port number: 2 port state: 63 details partner lacp pdu: system priority: 32768 oper key: 16 port priority: 32768 port number: 611 port state: 63 No particular settings for single interfaces. This is what has been set by the system for both em1, em2, em3 and em4 (output shown only for em1): [root@ractor ~]# ethtool -k em1 Features for em1: rx-checksumming: on tx-checksumming: on tx-checksum-ipv4: on tx-checksum-ip-generic: off [fixed] tx-checksum-ipv6: on tx-checksum-fcoe-crc: off [fixed] tx-checksum-sctp: off [fixed] scatter-gather: on tx-scatter-gather: on tx-scatter-gather-fraglist: off [fixed] tcp-segmentation-offload: on tx-tcp-segmentation: on tx-tcp-ecn-segmentation: on tx-tcp6-segmentation: on udp-fragmentation-offload: off [fixed] generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off [fixed] rx-vlan-offload: on [fixed] tx-vlan-offload: on ntuple-filters: off [fixed] receive-hashing: on highdma: on [fixed] rx-vlan-filter: off [fixed] vlan-challenged: off [fixed] tx-lockless: off [fixed] netns-local: off [fixed] tx-gso-robust: off [fixed] tx-fcoe-segmentation: off [fixed] tx-gre-segmentation: off [fixed] tx-ipip-segmentation: off [fixed] tx-sit-segmentation: off [fixed] tx-udp_tnl-segmentation: off [fixed] tx-mpls-segmentation: off [fixed] fcoe-mtu: off [fixed] tx-nocache-copy: off loopback: off [fixed] rx-fcs: off [fixed] rx-all: off [fixed] tx-vlan-stag-hw-insert: off [fixed] rx-vlan-stag-hw-parse: off [fixed] rx-vlan-stag-filter: off [fixed] busy-poll: off [fixed] Gianluca