Check bond nic status

from https://www.nextstep4it.com/check-network-bonding-in-centos-rhel/

Status of Bond interfaces

[root@localhost ~]# cat /proc/net/bonding/bond0

[root@amastest script]#  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: eno2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eno2
MII Status: up
Speed: 100 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 30:e1:71:62:f8:c9
Slave queue ID: 0

Slave Interface: ens3f3
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 40:a8:f0:db:ed:27
Slave queue ID: 0

[root@amastest script]#

According to the above Output , Active Passive Bonding is configured , where eth0 and eth4 are bonded together and form the bond interface(i.e bond0) . Lan cards eth0 & eth4 both are up and eth0 is active

$ethtool eth0 |grep -i speed
Speed: 1000Mb/s

[root@amastest net]# ethtool ens3f3
Settings for ens3f3:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Speed: Unknown!
        Duplex: Unknown! (255)
        Port: Twisted Pair
        PHYAD: 4
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: d
        Current message level: 0x000000ff (255)
                               drv probe link timer ifdown ifup rx_err tx_err

        Link detected: no