Networking issue: Multiple NICs unable to switch from Bonding Mode 4 to Mode 1 (backup1)

Problem:

I am trying to switch my network configuration from bonding mode 4 to backup 1.  When I do this in the GUI I lose my network connectivity to the server and I have to reset it back to the following to get it back online. 

Can anyone tell me why I cannot change the mode to mode 1 (backup1).  I thought this should be a safe change to make.

Other notes:

• I have a router based static IP reservation for the eth0 MAC e0:3f:49:a6:12:97
• I have all four NICs connected to the router showing activity lights for each

Network.cfg (original working version)

Quote

# Generated settings:
IFNAME[0]="br0"
BONDNAME[0]="bond0"
BONDING_MIIMON[0]="100"
BRNAME[0]="br0"
BRSTP[0]="no"
BRFD[0]="0"
BONDING_MODE[0]="4"
BONDNICS[0]="eth0 eth1 eth2 eth3"
BRNICS[0]="bond0"
PROTOCOL[0]="ipv4"
USE_DHCP[0]="yes"
IPADDR[0]=""
NETMASK[0]="255.255.255.0"
GATEWAY[0]="192.168.1.1"
DNS_SERVER1="192.168.1.1"
USE_DHCP6[0]="no"
DHCP6_KEEPRESOLV="no"
SYSNICS="1"

network-rules.cfg (original working version that remains unchanged)

Quote

# PCI device 0x8086:0x105e (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:17:d6:8c:6a", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

# PCI device 0x8086:0x107d (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:17:95:9b:29", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="e0:3f:49:a6:12:97", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x8086:0x105e (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:17:d6:8c:6b", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3"

network.cfg (new file generated after I change the mode to mode1) Doesn't work at all, no network connectivity

Quote

# Generated settings:
IFNAME[0]="br0"
BONDNAME[0]="bond0"
BONDING_MIIMON[0]="100"
BRNAME[0]="br0"
BRSTP[0]="no"
BRFD[0]="0"
BONDING_MODE[0]="1"
BONDNICS[0]="eth0 eth1 eth2 eth3"
BRNICS[0]="bond0"
PROTOCOL[0]="ipv4"
USE_DHCP[0]="yes"
DHCP_KEEPRESOLV="no"
USE_DHCP6[0]="no"
SYSNICS="1"

Edited December 8, 20214 yr by kiowa2005