Setting up LACP (802.3ad) on Linux Systems

descr

we want LACP slow DUs to be compliant with cisco catalyst

we could also try raw channel (mode on on the switch side) but many netadmins say that’s a no go as it has bad side-effects to be expected.

warning // lessons learned

setting module settings within modprobe.d/ doesn’t seem to work anymore

setup

tail -n0 -F /var/log/*

vi /etc/modprobe.d/bonding.conf

alias bond0 bonding

# DOES NOT WORK ANYMORE???
#options bond0 miimon=100 mode=4
# active by default - lacp_active=1
# slow LACPDUs by default - lacp_rate=0

apply

modprobe bonding

# WORKAROUND HERE
echo 4 > /sys/class/net/bond0/bonding/mode
ifconfig bond0 10.4.4.1/24 up
ifconfig bond0 10.4.4.2/24 up

slave interfaces need to be down for joining the aggregate

echo +eth1 > /sys/class/net/bond0/bonding/slaves
echo +eth2 > /sys/class/net/bond0/bonding/slaves
echo +eth3 > /sys/class/net/bond0/bonding/slaves

check

lsmod | grep bonding

cat /proc/net/bonding/bond0
    cat /sys/class/net/bonding_masters
cat /sys/class/net/bond0/bonding/slaves

cat /sys/class/net/bond0/bonding/miimon
cat /sys/class/net/bond0/bonding/mode
cat /sys/class/net/bond0/bonding/lacp_rate
cat /sys/class/net/bond0/bonding/xmit_hash_policy

you’re good to go to setup lacp on the switch

acceptance

see benchmarks/lacp

resources

https://backdrift.org/lacp-configure-network-bonding-linux

http://aarvik.dk/how-to-setup-lacp-network-bonding-interface-on-rhel-centos-7/