dmesg from the server in question:
<code>[339893.721555] ------------[ cut here ]------------
[339893.721566] WARNING: at net/sched/sch_generic.c:259 dev_watchdog+0x270/0x280()
[339893.721568] NETDEV WATCHDOG: ens1f0 (e1000e): transmit queue 0 timed out
[339893.721570] Modules linked in: vhost_net macvtap macvlan nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd sunrpc fscache xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT iptable_filter ip_tables tun bridge 8021q garp stp mrp llc bonding vfat fat coretemp kvm_intel iTCO_wdt kvm cdc_ether crc32c_intel ipmi_devintf usbnet iTCO_vendor_support mii i7core_edac serio_raw lpc_ich ipmi_si ioatdma ipmi_msghandler edac_core i2c_i801 shpchp pcspkr dca mfd_core acpi_cpufreq ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_common sr_mod cdrom mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm ata_generic drm pata_acpi mptsas ata_piix scsi_transport_sas libata
[339893.721628]  e1000e mptscsih mptbase i2c_core ptp bnx2 pps_core dm_mirror dm_region_hash dm_log dm_mod
[339893.721637] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-229.4.2.el7.x86_64 #1
[339893.721638] Hardware name: IBM System x3550 M2 -[7946W1A]-/49Y6512, BIOS -[D6E162AUS-1.20]- 05/07/2014
[339893.721640]  ffff88085fc03d90 b38c2f3260a6249e ffff88085fc03d48 ffffffff81604eaa
[339893.721645]  ffff88085fc03d80 ffffffff8106e34b 0000000000000000 ffff8810517c4000
[339893.721648]  ffff881051aa7080 0000000000000001 0000000000000000 ffff88085fc03de8
[339893.721651] Call Trace:
[339893.721653]  <IRQ>  [<ffffffff81604eaa>] dump_stack+0x19/0x1b
[339893.721664]  [<ffffffff8106e34b>] warn_slowpath_common+0x6b/0xb0
[339893.721667]  [<ffffffff8106e3ec>] warn_slowpath_fmt+0x5c/0x80
[339893.721671]  [<ffffffff8151e090>] dev_watchdog+0x270/0x280
[339893.721674]  [<ffffffff8151de20>] ? dev_graft_qdisc+0x80/0x80
[339893.721679]  [<ffffffff8107e046>] call_timer_fn+0x36/0x110
[339893.721682]  [<ffffffff8151de20>] ? dev_graft_qdisc+0x80/0x80
[339893.721684]  [<ffffffff8107fecf>] run_timer_softirq+0x21f/0x320
[339893.721688]  [<ffffffff81077bf7>] __do_softirq+0xf7/0x290
[339893.721692]  [<ffffffff8161671c>] call_softirq+0x1c/0x30
[339893.721697]  [<ffffffff81015de5>] do_softirq+0x55/0x90
[339893.721699]  [<ffffffff81077f95>] irq_exit+0x115/0x120
[339893.721702]  [<ffffffff81617395>] smp_apic_timer_interrupt+0x45/0x60
[339893.721706]  [<ffffffff81615a5d>] apic_timer_interrupt+0x6d/0x80
[339893.721707]  <EOI>  [<ffffffff810ce567>] ? clockevents_notify+0x127/0x140
[339893.721715]  [<ffffffff814aaa2f>] ? cpuidle_enter_state+0x4f/0xc0
[339893.721718]  [<ffffffff814aab65>] cpuidle_idle_call+0xc5/0x200
[339893.721722]  [<ffffffff8101d21e>] arch_cpu_idle+0xe/0x30
[339893.721726]  [<ffffffff810c6985>] cpu_startup_entry+0xf5/0x290
[339893.721730]  [<ffffffff815f33e7>] rest_init+0x77/0x80
[339893.721735]  [<ffffffff81a45057>] start_kernel+0x429/0x44a
[339893.721738]  [<ffffffff81a44a37>] ? repair_env_string+0x5c/0x5c
[339893.721741]  [<ffffffff81a44120>] ? early_idt_handlers+0x120/0x120
[339893.721743]  [<ffffffff81a445ee>] x86_64_start_reservations+0x2a/0x2c
[339893.721746]  [<ffffffff81a44742>] x86_64_start_kernel+0x152/0x175
[339893.721748] ---[ end trace b05b250bdafd520d ]---
[339893.721803] e1000e 0000:15:00.0 ens1f0: Reset adapter unexpectedly
[339893.778541] bonding: bond1: link status definitely down for interface ens1f0, disabling it
[339897.020473] e1000e: ens1f0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
[339897.080356] bonding: bond1: link status definitely up for interface ens1f0, 1000 Mbps full duplex.
[343741.003715] virbr201: port 2(vnet0) entered disabled state
[343741.004401] device vnet0 left promiscuous mode
[343741.004421] virbr201: port 2(vnet0) entered disabled state
[344116.096123] virbr203: port 2(vnet2) entered disabled state
[344116.097088] device vnet2 left promiscuous mode
[344116.097113] virbr203: port 2(vnet2) entered disabled state
[344524.383123] virbr201: port 1(bond1.201) entered disabled state
[344524.384074] virbr203: port 1(bond1.203) entered disabled state
[344524.385178] virbr204: port 1(bond1.204) entered disabled state
[344524.386135] device bond1 left promiscuous mode
[344524.386148] device ens1f0 left promiscuous mode
[344524.386255] device ens3f0 left promiscuous mode
[344524.386518] virbr301: port 1(bond1.301) entered disabled state
[344531.513072] 8021q: adding VLAN 0 to HW filter on device bond1
[344531.513127] device bond1 entered promiscuous mode
[344531.513136] device ens1f0 entered promiscuous mode
[344531.513183] device ens3f0 entered promiscuous mode
[344531.513403] virbr201: port 1(bond1.201) entered forwarding state
[344531.513409] virbr201: port 1(bond1.201) entered forwarding state
[344531.513540] virbr203: port 1(bond1.203) entered forwarding state
[344531.513545] virbr203: port 1(bond1.203) entered forwarding state
[344531.513669] virbr204: port 1(bond1.204) entered forwarding state
[344531.513677] virbr204: port 1(bond1.204) entered forwarding state
[344531.513823] virbr301: port 1(bond1.301) entered forwarding state
[344531.513828] virbr301: port 1(bond1.301) entered forwarding state</code>

Switch log:
<code>33w6d: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
33w6d: %LINK-3-UPDOWN: Interface GigabitEthernet0/11, changed state to down
33w6d: %LINK-3-UPDOWN: Interface GigabitEthernet0/11, changed state to up
33w6d: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to up</code>