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[neighsync] Modification for ignoring neighbor entries #3330

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Commits on Oct 17, 2024

  1. [neighsync] Modification for ignoring neighbor entries

    1. [neighsync] Ignore neighbor entries on non-router-interface
    
    2. Don't ignore reserved IPv4 LL address
    
    - For BGP unnumber, reserved IPv4 LL (169.254.0.1) will be used as
      next hop.
      FRR configure it as permanent neighbor when BGP session is established.
      We ignore neighbor entry learned on non-router interface currently,
      this reserved IPv4 LL will not be synced if we don't configure use-link-local-only
      before this neighbor learnt event.
    
    3. [neighsyncd] Ignore null MAC address neighbor while adding neighbor
    
    By executing the following commands would cause the netlink message bring a NULL MAC neighbor
    and cause the neighsyncd exception.
    
    The libnl api `nl_addr2str` would output the string `"none"` if the lladdr is `NULL`,
    and the string is an exception case for the class `MacAddress`. Therefore, this
    commit add to ignore this condition while the `rtnl_neigh_get_lladdr` can not
    retrieve the lladdr successfully
    
    ```
    ip neigh replace 1.2.3.8 lladdr 00:33:55:66:55:66 dev Vlan10 nud noarp
    ip neigh replace 1.2.3.8 lladdr 00:33:55:66:55:66 dev Vlan10 nud none
    ```
    peter-yu committed Oct 17, 2024
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