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Link Aggregation
Starting with firmware version Asuswrt-Merlin 3.0.0.4.374.33 bonding.ko Driver is included in the firmware.
There are several modes which should be possible.
- 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
The only mode that has been tested is 802.3ad
NIC bonding in mode 802.3ad achieves 2 goals.
- Increased Throughput
- Failover Protection
But requires either a Switch/PC/NAS which also supports Link Aggregation.
METHOD 1 - LINKAGG (Custom Script)
To Simplify setup and management a small shell script has been created.
Which can be downloaded
Usage is as follows.
---- Link Aggregation Version 1.5 Help ----
Dynamically enable Link Aggregation using 802.3ad
802.3ad requires a Switch/PC/NAS which...
also supports 802.3ad to function correctly
Usage: /path/to/LinkAgg <port> <port>
Example: /path/to/LinkAgg 3 4
Only 2 ports are currently supported
--- Special Flags ---
Help: -h or --help
Status: -s or --status
Delete: -d or --delete
Version: -v or --version
To Make the Configuration persistent across reboots.
- Enable JFFS partition
- Edit /jffs/scripts/services-start to call the script at each boot
/Path/to/LinkAgg 3 4
Additional Notes.
Any additional configuration can be done manually in the services-start script
The Script above will use the sysfs driver because it does not require any additional packages.
Optionally users can choose to install entware - ifenslave package.
*** entware is for MIPS based routers only ***
More Info Here http://forums.smallnetbuilder.com/showthread.php?t=12735
METHOD 2 - For AC68U/R/P Routers
Step 1 - NVRAM Edits | Note: You will need to repeat this step if you clear the nvram ie. Beta to Final versions, resetting to Factory default
Apply the following changes to the router's nvram:
nvram set vlan4ports="3 5t"
nvram set vlan5ports="4 5t"
nvram set vlan4hwname=et0
nvram set vlan5hwname=et0
nvram commit
Step 2 - Create/Edit services-start script
Include the following code in services-start script located in /jffs/scripts/ (you will need to create this file from scratch, if you haven't done so already, with the right permissions)
#!/bin/sh
# Logger Services
logger -t "($(basename ))" $$ SERVICES-START being started....
logger -t "($(basename ))" $$ Bonding ports 3 and 4 commencing....
# Pre-Bonding
robocfg vlan 1 ports "1 2 5*"
# Bonding
sleep 2s
modprobe bonding
# Setting mode to 802.3ad
echo 802.3ad > /sys/class/net/bond0/bonding/mode
# Setting LACP rate to fast
echo fast > /sys/class/net/bond0/bonding/lacp_rate
# Setting MII monitoring interval to 50
echo 50 > /sys/class/net/bond0/bonding/miimon
# Setting xmit hash policy to layer3+4
echo 1 > /sys/class/net/bond0/bonding/xmit_hash_policy
ip link set bond0 up
echo +vlan4 > /sys/class/net/bond0/bonding/slaves
echo +vlan5 > /sys/class/net/bond0/bonding/slaves
brctl addif br0 bond0
# Post-Bonding
sleep 2s
logger -t "($(basename $0))" $$ Bonding Status....
cat /proc/net/bonding/bond0 | sed 's/^/+++ /' | logger
Step 3 - Create/Edit firewall-start script
Include the following code in firewall-start script located in /jffs/scripts/ (you will need to create this file from scratch, if you haven't done so already, with the right permissions)
#!/bin/sh
# Bonding
iptables -I INPUT 1 -i bond0 -j ACCEPT
iptables -I INPUT 1 -i vlan4 -j ACCEPT
iptables -I INPUT 1 -i vlan5 -j ACCEPT
Step 4 - Set the switch's LAG hashing mode
This is the LAG config profile you created for the 2 switch ports you have assigned to the router's port 3 and 4.
Set the hashing mode to "Source/Destination MAC, VLAN, EtherType, source MODID/port" or the equivalent mode in your switch.
Step 5 - Reboot
Additional Notes.
This method may be adapted to work with other Asus routers. Hint: Internal switch port mappings.
More info Here http://forums.smallnetbuilder.com/showthread.php?t=20441