ubuntu 16.04 interface bonding memo, configuration and status check.

system

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

$ lsmod | grep bond
bonding               143360  0

$ dpkg -l | grep -Ei "ifenslave|bridge-utils"
ii  bridge-utils                          1.5-9ubuntu1                               amd64        Utilities for configuring the Linux Ethernet bridge
ii  ifenslave                             2.7ubuntu1                                 all          configure network interfaces for parallel routing (bonding)

configuration

• file: /etc/network/interfaces

auto p1p1
iface p1p1 inet manual
  bond-master bond0

auto p5p1
iface p5p1 inet manual
  bond-master bond0

auto bond0
iface bond0 inet manual
  slaves p1p1 p5p1
  bond_mode active-backup
  bond_miimon 100

check status by command line

$ ip a s p1p1 | head -1
3: p1p1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP group default qlen 1000

$ ip a s p5p1 | head -1
6: p5p1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP group default qlen 1000

$ ip a s bond0 | head -1
7: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP group default qlen 1000

$ brctl show br0
bridge name     bridge id               STP enabled     interfaces
br0             8000.001b2136b8a4       no              bond0

check status by proc file system

$ cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: p5p1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: p5p1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:1b:21:(snip)
Slave queue ID: 0

Slave Interface: p1p1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:1b:21:(snip)
Slave queue ID: 0

check status by sysfs

$ cat /sys/class/net/bond0/bonding/mode
active-backup 1

$ cat /sys/class/net/bond0/bonding/mii_status
up

$ cat /sys/class/net/bond0/bonding/miimon
100

$ cat /sys/class/net/bond0/bonding/active_slave
p5p1

$ cat /sys/class/net/bond0/bonding/slaves
p5p1 p1p1