.. _switching: .. toctree:: Switching ========= Skills to be Learned ---------------------- #. Associate an interface with a bridge domain #. Create a loopback interaface #. Create a BVI (Bridge Virtual Interface) for a bridge domain #. Examine a bridge domain FD.io VPP command learned in this exercise -------------------------------------------- #. `show bridge `__ #. `show bridge detail `__ #. `set int l2 bridge `__ #. `show l2fib verbose `__ Topology --------- .. figure:: /_images/Switching_Topology.jpg :alt: Switching Topology Switching Topology Initial state --------------- Unlike previous exercises, for this one you want to start tabula rasa. Note: You will lose all your existing config in your FD.io VPP instances! To clear existing config from previous exercises run: .. code-block:: console $ ps -ef | grep vpp | awk '{print $2}'| xargs sudo kill $ sudo ip link del dev vpp1host $ # do the next command if you are cleaing up from this example $ sudo ip link del dev vpp1vpp2 Run FD.io VPP instances ------------------------ #. Run a vpp instance named **vpp1** #. Run a vpp instance named **vpp2** Connect vpp1 to host --------------------- #. Create a veth with one end named vpp1host and the other named vpp1out. #. Connect vpp1out to vpp1 #. Add ip address 10.10.1.1/24 on vpp1host Connect vpp1 to vpp2 --------------------- #. Create a veth with one end named vpp1vpp2 and the other named vpp2vpp1. #. Connect vpp1vpp2 to vpp1. #. Connect vpp2vpp1 to vpp2. Configure Bridge Domain on vpp1 -------------------------------- Check to see what bridge domains already exist, and select the first bridge domain number not in use: .. code-block:: console vpp# show bridge-domain ID Index Learning U-Forwrd UU-Flood Flooding ARP-Term BVI-Intf 0 0 off off off off off local0 In the example above, there is bridge domain ID '0' already. Even though sometimes we might get feedback as below: .. code-block:: console no bridge-domains in use the bridge domain ID '0' still exists, where no operations are supported. For instance, if we try to add host-vpp1out and host-vpp1vpp2 to bridge domain ID 0, we will get nothing setup. .. code-block:: console vpp# set int l2 bridge host-vpp1out 0 vpp# set int l2 bridge host-vpp1vpp2 0 vpp# show bridge-domain 0 detail show bridge-domain: No operations on the default bridge domain are supported So we will create bridge domain 1 instead of playing with the default bridge domain ID 0. Add host-vpp1out to bridge domain ID 1 .. code-block:: console vpp# set int l2 bridge host-vpp1out 1 Add host-vpp1vpp2 to bridge domain ID1 .. code-block:: console vpp# set int l2 bridge host-vpp1vpp2 1 Examine bridge domain 1: .. code-block:: console vpp# show bridge-domain 1 detail BD-ID Index BSN Age(min) Learning U-Forwrd UU-Flood Flooding ARP-Term BVI-Intf 1 1 0 off on on on on off N/A Interface If-idx ISN SHG BVI TxFlood VLAN-Tag-Rewrite host-vpp1out 1 1 0 - * none host-vpp1vpp2 2 1 0 - * none Configure loopback interface on vpp2 ------------------------------------- .. code-block:: console vpp# create loopback interface loop0 Add the ip address 10.10.1.2/24 to vpp2 interface loop0. Set the state of interface loop0 on vpp2 to 'up' Configure bridge domain on vpp2 -------------------------------- Check to see the first available bridge domain ID (it will be 1 in this case) Add interface loop0 as a bridge virtual interface (bvi) to bridge domain 1 .. code-block:: console vpp# set int l2 bridge loop0 1 bvi Add interface vpp2vpp1 to bridge domain 1 .. code-block:: console vpp# set int l2 bridge host-vpp2vpp1 1 Examine the bridge domain and interfaces. Ping from host to vpp and vpp to host -------------------------------------- #. Add trace on vpp1 and vpp2 #. ping from host to 10.10.1.2 #. Examine and clear trace on vpp1 and vpp2 #. ping from vpp2 to 10.10.1.1 #. Examine and clear trace on vpp1 and vpp2 Examine l2 fib --------------- .. code-block:: console vpp# show l2fib verbose Mac Address BD Idx Interface Index static filter bvi Mac Age (min) de:ad:00:00:00:00 1 host-vpp1vpp2 2 0 0 0 disabled c2:f6:88:31:7b:8e 1 host-vpp1out 1 0 0 0 disabled 2 l2fib entries .. code-block:: console vpp# show l2fib verbose Mac Address BD Idx Interface Index static filter bvi Mac Age (min) de:ad:00:00:00:00 1 loop0 2 1 0 1 disabled c2:f6:88:31:7b:8e 1 host-vpp2vpp1 1 0 0 0 disabled 2 l2fib entries