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.. _switching:
.. toctree::
Switching
=========
Skills to be Learned
----------------------
#. Associate an interface with a bridge domain
#. Create a loopback interface
#. Create a BVI (Bridge Virtual Interface) for a bridge domain
#. Examine a bridge domain
FD.io VPP command learned in this exercise
--------------------------------------------
#. `show
bridge <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_l2.html#clicmd_show_bridge-domain>`__
#. `show bridge
detail <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_l2.html#clicmd_show_bridge-domain>`__
#. `set int l2
bridge <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_l2.html#clicmd_set_interface_l2_bridge>`__
#. `show l2fib
verbose <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_l2.html#clicmd_show_l2fib>`__
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 cleaning 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
|
