Linux Channel Bonding not working in ARP IP target scenario
 

Hi,
I am trying to configure Channel bonding on RHEL 5.6 by using arp_ip_target and arp_interval method as suggest by below link
https://blogs.oracle.com/networking/...x_bonding_tips

Below is my configuration files (using eth2 and eth3 )

[root@Tbox network-scripts]# cat ifcfg-bond0
DEVICE=bond0
#BOOTPROTO=static
TYPE=Bonding
ONBOOT=yes

[root@Tbox network-scripts]# cat ifcfg-bond0.117
DEVICE=bond0.117
BOOTPROTO=static
ONBOOT=yes
IPADDR=10.1.17.238
USERCTL=no
NETMASK=255.255.255.0
VLAN=yes
TYPE=Bonding
NETWORK=10.1.17.0
GATEWAY=10.1.17.1

[root@Tbox network-scripts]# cat ifcfg-eth2
DEVICE=eth2
BOOTPROTO=none
TYPE=Ethernet
SLAVE=yes
MASTER=bond0
USERCTL=no
ONBOOT=yes

[root@Tbox network-scripts]# cat ifcfg-eth3
DEVICE=eth3
BOOTPROTO=none
TYPE=Ethernet
SLAVE=yes
MASTER=bond0
USERCTL=no
ONBOOT=yes

# cat /etc/modprobe.conf
…….
……….
alias bond0 bonding
options bonding mode=1 arp_interval=1000 arp_ip_target=10.1.17.1
Below is status of Channel bonding

[root@Tbox network-scripts]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.5.0 (November 4, 2008)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: eth3
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0
ARP Polling Interval (ms): 1000
ARP IP target/s (n.n.n.n form): 10.1.17.1

Slave Interface: eth2
MII Status: down
Link Failure Count: 0
Permanent HW addr: 00:10:18:83:4a:74

Slave Interface: eth3
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:10:18:83:4a:76



NOW problem is that system does not detect link failure if uplink of eth2 and eth3 switch goes down. However it shift the traffic to other if I manually down one interface like

# ifconfig eth3 down

Why is it not able to detect link failure by using ARP IP target ?