Link Aggregation (LAG)

The following options are available in the prestera driver for LAG configuration:

• Bonding method The Linux bonding driver provides a method for aggregating multiple network interfaces into a single logical "bonded" interface. The current version of the bonding driver is available in the “drivers/net/bonding” subdirectory of the most recent kernel source. It is recommended to configure bonding via iproute2 (netlink) or sysfs, the old ifenslave control utility is obsolete.

Bonding Method

• To create a LAG bond device:
  $ ip link add name bond1 type bond
• To remove a LAG bond device:
  $ ip link del dev bond1
• To set operational mode
  In general, the bond device can support different operational modes. The operational mode can be set using following command:
  $ ip link set dev bond1 type bond
  NOTE: LACP (802.3ad) is the only supported mode.
• To add a member to a LAG
  $ ip link set dev sw1p1 master bond1
• To remove a member from a LAG:
  $ ip link set dev sw1p1 nomaster
• To show LAG information:
  $ cat /proc/net/bonding/bond1

Enabling a Member in a LAG

To enable a specific member in a LAG, the appropriate net_dev interface should be enabled:
$ ip link set sw1p1 up

Disabling a Member in a LAG

In order to disable a specific member in a LAG, enable the appropriate net_dev interface:
$ ip link set sw1p1 down

Administrative Status of a LAG Interface

In order to bring up/down the LAG interface, run the following command:
$ ip link set [bond1] [up|down]

MAC Address Setting on a LAG Interface

The MAC address of LAG interface is the address of first member of this LAG.
In order to change it, run the following command:
$ ip link set [bond1] address [XX:XX:XX:XX:XX:XX]

** MTU Setting on a LAG Interface
In order to set MTU on the LAG interface, run the following command:
$ ip link set [bond1] mtu [XX]

** Speed and Auto-Negotiation Setting on a LAG Interface
The speed and auto-negotiation setting are not supported for bond interface.
In order to configure the speed or auto-negotiation, complete the following actions:

• Disable LAG interface (ip link set [bond1] down)
• Disable LAG members(ip link set [sw1pX] down)
• Configure speed or auto-negotiation for every LAG member
• Enable LAG members(ip link set [sw1pX] up)
• Enable LAG interface (ip link set [bond1] up)

** Adding a LAG Interface to a Bridge
To add a LAG interface to a bridge, run the following command:
$ ip link set [bond1] master br0

** Adding a LAG Interface to VLAN To configure a VLAN on the LAG interface, run the following command:
$ bridge vlan add vid [XX] pvid dev [bond1]

** Setting Bridge LAG Interface Attributes
To configure an bridge port attributes for a LAG, run the following command:
$ bridge link set dev [bond1] learning off flood off

** Add IP address to a LAG To configure an IP address can be configured for a LAG, run the following command:
$ ip addr add [192.168.1.2/24] dev [bond1]

** VRF
To set a bond interface as a part of virtual router:
$ ip link set dev [bond1] master [vrf_name]