Link Aggregation

Create redundancy by defining a LAG port, and simulate a link failure to test the solution.

1. Choose one of the following substeps to setup your preferred LAG configuration:
   1. To setup active/backup, define a LAG port, specifying a primary port (port 0) and a backup port (port 1):

      ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-extra="-n4 \
      --iova-mode=pa --vfio-vf-token=14d63f20-8445-11ea-8900-1f9ce7d5650d \
      -a 0000:02:00.0,representor=[4-5],mode=1,primary=0,backup=1 \
      -a 0000:02:00.4 -a 0000:02:00.5

   2. To setup active/active:

      ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-extra="-n4 \
      --iova-mode=pa --vfio-vf-token=14d63f20-8445-11ea-8900-1f9ce7d5650d \
      -a 0000:02:00.0,representor=[4-5],mode=4 -a 0000:02:00.4 -a 0000:02:00.5
      

      Note: active/active does not define a primary port. Both available ports, port 0 and port 1, are bonded together into one active/active LAG port. Since only 2 ports are available, no implicit specification of participating ports in the bond is required.
2. Add the OVS bridge:

   ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev

3. Create a virtual port:

   ovs-vsctl add-port br0 dpdkvp0 -- set int dpdkvp0 type=dpdk \ 
     options:"dpdk-devargs=0000:XX:XX.0,representor=[4]"

   where:

   XX:XX is the PCI bus ID, found with the command lspci | grep Napatech.

4. Create a LAG port:

   ovs-vsctl add-port br0 ntbond0 \
   -- set interface ntbond0 type=dpdk \
       options:dpdk-devargs=class=eth,mac=xx:xx:xx:xx:xx

   where mac=xx:xx:xx:xx:xx:xx is the MAC address of the primary physical port.

   For more information see Reading MAC Addresses of the SmartNIC.

5. Repeat these steps for host2.
6. Simulate a link failure:
   1. Create and start up the VMs.
      See Building and Starting a Virtual Machine for more information.
   2. Disable the primary port (port 0), by removing the link cable:
   3. Enable port 1:
      Use the following command to test that the VMs are still able to pass traffic:

      ping 192.168.1.<x>

      where the final digit (1 or 2) identifies the host IP address. This is an example of the command and resulting output:

      [root@fedora29-img-vm-1 ~]# ping 192.168.1.1
      PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
      64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.771 ms
      64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.278 ms
      64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.256 ms