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doc: add some documentation about bgp evpn netns support

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a linux configuration gives some explanation on how to set up an evpn
overlay in network namespaces.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2020-02-06 09:32:21 +01:00
parent de0ebb2540
commit 89b97c33d7
1 changed files with 21 additions and 0 deletions
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doc/user/bgp.rst
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@ -2391,6 +2391,27 @@ the same behavior of using same next-hop and RMAC values.
Enables or disables advertise-pip feature, specifiy system-IP and/or system-MAC Enables or disables advertise-pip feature, specifiy system-IP and/or system-MAC
parameters. parameters.
Support with VRF network namespace backend
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It is possible to separate overlay networks contained in VXLAN interfaces from
underlay networks by using VRFs. VRF-lite and VRF-netns backends can be used for
that. In the latter case, this is necessary to set both bridge and vxlan interface
on the same network namespace, as below example illustrates:
.. code-block:: shell
# linux shell
ip netns add vrf1
ip link add name vxlan101 type vxlan id 101 dstport 4789 dev eth0 local 10.1.1.1
ip link set dev vxlan101 netns vrf1
ip netns exec vrf1 ip link set dev lo up
ip netns exec vrf1 brctl addbr bridge101
ip netns exec vrf1 brctl addif bridge101 vxlan101
This makes possible to separate not only layer 3 networks like VRF-lite networks.
Also, VRF netns based make possible to separate layer 2 networks on separate VRF
instances.
.. _bgp-cisco-compatibility: .. _bgp-cisco-compatibility:
Cisco Compatibility Cisco Compatibility