tree 1fa611b63988898d448c14efa617ae8b63c6a20a
parent a6d400c9158b10207cde40a428ebf2c27f105c0a
author Paul Jakma <paul@jakma.org> 1442573433 +0100
committer Paul Jakma <paul.jakma@hpe.com> 1473759403 +0100

zebra: Add command to configure default for link-state, and make it sticky

* Provide a way for the user to specify their own preference for the default
  behaviour of link-detect, independent of the compiled in default.

  Add a global "default link-detect (on|off)" command to zebra, to set
  the default policy for link-detect accordingly.  The command is "sticky" -
  when set it will stay set and always be written out, regardless of how it
  compares to the baked-in, compile-time default.

  The per-interface "link-detect" command is similarly made sticky.

* zebra/interface.h: (zebra_if_linkdetect;) enum for link-detect configured
  state.
  (struct zebra_if_defaults) Global link-detect default
  (struct zebra_if) Add field for per-iface link-detect default.
* lib/if.c: (if_create_vrf) Remove the default flag setting on if-create
  here, it's a zebra flag so do it in zebra's if_zebra_new_hook
* zebra/interface.c: Add static storage for global defaults.
  (if_zebra_new_hook) Set the link-detect flag on new ifaces according to the
  baked in default or else the configured global default.
  (config_write_zebra_if_defaults,default_linkdetect_cmd) global link-detect
  command and config write out machinery.
  (linkdetect_cmd) Set the configuration state rather than the flag.
  The new hook will then set the interface flag when the if comes up.
  (if_config_write) Write config according to configured state, not the
  low-level flag.
  (zebra_if_init) add new commands.