1. Network Bonding (aka trunking, link aggregation)
David Liana

2. What is network bonding?
From Wikipedia: Channel bonding (also known as "Ethernet bonding") is a computer networking arrangement in which two or more network interfaces on a host computer are combined for redundancy or increased throughput.

3. Driver – “bonding” Several different modes supported
Linux Support
Driver – “bonding”
Several different modes supported

4. Modes balance-rr or 0 active-backup or 1 balance-xor or 2
broadcast or 3
802.3ad or 4
balance-tlb or 5
balance-alb or 6

5. Pre-Reqs 2 or more network cards of the same speed
Switch that supports bonding (aka Link aggregation or 802.3ad).
Turn off/uninstall network manager

6. Steps Load module Edit configurations for interfaces
Add config for bonded interface
Restart networking

7. Example setup for RHEL / Scientific Linux / CentOS / Fedora

8. alias bond0 bonding options bond0 mode=4 miimon=100
/etc/modprobe.d/bonding.conf
alias bond0 bonding
options bond0 mode=4 miimon=100

9. /etc/sysconfig/network-scripts/ifcfg-p20p1
DEVICE=p20p1
ONBOOT=yes
USERCTL=no
BOOTPROTO=none
HWADDR=00:24:1D:23:6F:28
SLAVE=yes
MASTER=bond0

10. /etc/sysconfig/network-scripts/ifcfg-p21p1
DEVICE=p21p1
ONBOOT=yes
USERCTL=no
BOOTPROTO=none
HWADDR=00:1F:D0:81:56:22
SLAVE=yes
MASTER=bond0

11. /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
ONBOOT=yes
NM_CONTROLLED=no
USERCTL=no
BOOTPROTO=none
IPADDR=
NETWORK=
BROADCAST=
GATEWAY=
DNS1=
DNS2=

12. /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=kirk.enterprise.local
GATEWAY=
GATEWAYDEV=bond0
NETWORKDELAY=5
NETWORKWAIT=yes

13. Load Modules and Restart Network
$ modprobe bonding
$ /etc/init.d/network restart
$ chkconfig –levels=345 network on

14. Questions?