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[Bug 2084905] [NEW] [RFE][OVN] Make use of the new flag 'always_tunnel' to tunnel the E/W traffic between logical switches

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Rodolfo Alonso <2084905@xxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Oct 2024 13:55:24 -0000
Reply-to: Bug 2084905 <2084905@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

Since [1], added in OVN 24.09.0, there is a new global flag
"NB_Global:options:always_tunnel" (disabled by default). When enabled,
the E/W traffic routed between logical switched is always tunnelled. The
router port MAC won't be leaked and the MTU issues are handled properly.

That allows to have mixed networks (tunnelled and non-tunnelled) in the
same Logical Router without the MTU issues described in [2][3][4]. With
this option enabled we can skip the LR configuration for VLAN/flat
networks ("reside-on-redirect-chassis" and "redirect-type" options) that
depends on the type of networks connected to the router.

[1]https://github.com/ovn-org/ovn/commit/87a29064066710aaa6a83f28059ae47647621df3#diff-9929cba282db9475dd8343b95e3b6a564d80dcef2f7a4594774fdc9ddd955df2
[2]https://bugs.launchpad.net/neutron/+bug/1920976
[3]https://bugs.launchpad.net/neutron/+bug/2003455
[4]https://bugs.launchpad.net/neutron/+bug/2012712

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2084905

Title:
  [RFE][OVN] Make use of the new flag 'always_tunnel' to tunnel the E/W
  traffic between logical switches

Status in neutron:
  New

Bug description:
  Since [1], added in OVN 24.09.0, there is a new global flag
  "NB_Global:options:always_tunnel" (disabled by default). When enabled,
  the E/W traffic routed between logical switched is always tunnelled.
  The router port MAC won't be leaked and the MTU issues are handled
  properly.

  That allows to have mixed networks (tunnelled and non-tunnelled) in
  the same Logical Router without the MTU issues described in [2][3][4].
  With this option enabled we can skip the LR configuration for
  VLAN/flat networks ("reside-on-redirect-chassis" and "redirect-type"
  options) that depends on the type of networks connected to the router.

  [1]https://github.com/ovn-org/ovn/commit/87a29064066710aaa6a83f28059ae47647621df3#diff-9929cba282db9475dd8343b95e3b6a564d80dcef2f7a4594774fdc9ddd955df2
  [2]https://bugs.launchpad.net/neutron/+bug/1920976
  [3]https://bugs.launchpad.net/neutron/+bug/2003455
  [4]https://bugs.launchpad.net/neutron/+bug/2012712

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