[Bug 2123914] [NEW] dynamic-routing-port-name option has no effect

[Frode Nordahl]

Public bug reported:

The dynamic-routing-port-name option was added to the
Logical_Router_Port table [0] as means of selecting which LRPs should
learn routes.  When used together with Open_vSwitch
external_ids:dynamic-routing-port-mapping, an LRP can also be mapped to
a system interface as found in the system routing tables.

The description of the option states: "Only learn routes associated with
the interface locally bound to the LSP or LRP  specified  here".

However, when an LR has LRPs with this option, learned routes are still
associated with all LRPs of an LR [1].

In order for the option to work as documented there would have to be a
check for whether any LRPs of an LR has this option, and if that is the
case, only consider those LRPs.

0: https://manpages.ubuntu.com/manpages/questing/man5/ovn-nb.5.html#logical_router_port%20table
1: https://github.com/ovn-org/ovn/blob/db748328f36592f76c1ea991f0ea1b1ac79902b5/controller/route.c#L208

** Affects: ovn (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2123914

Title:
  dynamic-routing-port-name option has no effect

Status in ovn package in Ubuntu:
  New

Bug description:
  The dynamic-routing-port-name option was added to the
  Logical_Router_Port table [0] as means of selecting which LRPs should
  learn routes.  When used together with Open_vSwitch
  external_ids:dynamic-routing-port-mapping, an LRP can also be mapped
  to a system interface as found in the system routing tables.

  The description of the option states: "Only learn routes associated
  with the interface locally bound to the LSP or LRP  specified  here".

  However, when an LR has LRPs with this option, learned routes are
  still associated with all LRPs of an LR [1].

  In order for the option to work as documented there would have to be a
  check for whether any LRPs of an LR has this option, and if that is
  the case, only consider those LRPs.

  0: https://manpages.ubuntu.com/manpages/questing/man5/ovn-nb.5.html#logical_router_port%20table
  1: https://github.com/ovn-org/ovn/blob/db748328f36592f76c1ea991f0ea1b1ac79902b5/controller/route.c#L208

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