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bonding: 802.3ad + active-backup not working
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nukleus
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Joined: 19 May 2011
Posts: 6

PostPosted: Thu Nov 15, 2012 4:55 pm    Post subject: bonding: 802.3ad + active-backup not working Reply with quote

Hi there,

I'm trying to create a 802.3ad bond to an HP ProCurve switch and want to combine that bond and the third NIC to an active-backup bond to another switch to have at least some connectivity in case the primary switch goes down for some reason. I'm having trouble creating this, including kernel panics that I could not capture and now I wonder if such a setup would even work the way I want. Schematics:
Code:
[eth0]
      \
       > bond0 (802.3ad)
      /                 \
[eth1]                   \
                          > bond1 (active-backup) -> br0
                         /
[eth2]------------------´
I used the following setup:
Code:
cat /etc/modprobe.d/bond.conf

alias bond0 bonding
options bond0 mode=802.3ad miimon=100 primary=eth0 max_bonds=2
alias bond1 bonding
options bond1 mode=active-backup miimon=100 primary=bond0 max_bonds=2
Code:
cat /etc/conf.d/net

modules="iproute2"

## eth0 && eth1 => failover bond0
config_eth0="null"
config_eth1="null"

config_bond0="null"
slaves_bond0="eth0 eth1"
rc_net_bond0_need="net.eth0 net.eth1"

## bond0 + eth2 => active backup bond1
config_eth2="null"

slaves_bond1="bond0 eth2"
rc_net_bond1_need="net.bond0 net.eth2"

# bridge br0 on top of bond1
brctl_br0="setfd 0
           stp off"
#                   sethello 1"
bridge_br0="bond1"
config_br0="172.20.12.12/19
            2001:7c0:409:8001::12:12/64
            2001:7c0:409:8001::c0:ffee"
routes_br0="routes etc"
rc_net_br0_need="net.bond1"

# http://www.twam.info/linux/ethernet-bonding-with-linux-and-8023ad
preup()
{
       if [[ ${IFACE} == "bond0" ]];
       then
               BOND_MODE="802.3ad"
               BOND_MIIMON="100"
               echo ${BOND_MODE} > /sys/class/net/bond0/bonding/mode
               echo ${BOND_MIIMON} > /sys/class/net/bond0/bonding/miimon
               einfo "Bonding mode is set to ${BOND_MODE} on ${IFACE}"
               einfo "MII monitor interval is set to ${BOND_MIIMON} ms on ${IFACE}"
       elif [[ ${IFACE} == "bond1" ]];
       then
               BOND_MODE="active-backup"
               BOND_MIIMON="100"
               echo ${BOND_MODE} > /sys/class/net/bond1/bonding/mode
               echo ${BOND_MIIMON} > /sys/class/net/bond1/bonding/miimon
               einfo "Bonding mode is set to ${BOND_MODE} on ${IFACE}"
               einfo "MII monitor interval is set to ${BOND_MIIMON} ms on ${IFACE}"
       else
               einfo "Doing nothing on ${IFACE}"
       fi
       return 0
}
This scenario led to several pages of panic traces that I could not capture in one instance, and to a total system halt w/o any output in another instance. Am I doing something entirely wrong is that simply not meant to work at all?

System is a hardened gentoo running hardened-kernel 3.6.6 on a Supermicro-board with two onboard nics using "igb", eth2 is an e1000e intel nic
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AngelKnight
Tux's lil' helper
Tux's lil' helper


Joined: 14 Jan 2003
Posts: 118

PostPosted: Fri Nov 16, 2012 5:27 am    Post subject: Reply with quote

Just do:

bond0: eth0 + eth1
br0: bond0 + br2

You need to read up on 802.3ad if you think that hierarchical 802.3ad makes sense.
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nukleus
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Joined: 19 May 2011
Posts: 6

PostPosted: Sat Nov 17, 2012 4:55 pm    Post subject: Reply with quote

I didn't want hierarchical 802.3ad, but rather one 802.3ad and one active-backup bond to prevent the system from falling off the network when the primary switch goes offline
Also, a bridge over 802.3ad + eth2 resultet in other devices on the network (presumably mostly apple hardware) to flood the network with mdns *cast packets which brought down the network with ~800 active hosts so I couldn't test if it worked as intended.
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