NFD

This problem is discovered in production. Steps to reproduce is unknown.

On UCLA SPURS router's status page, the following output is found:

<fibEntry>
  <prefix>/ndn/NLSR/LSA</prefix>
  <nextHops>
    <nextHop><faceId>270</faceId><cost>1</cost></nextHop>
    <nextHop><faceId>260</faceId><cost>1</cost></nextHop>
    <nextHop><faceId>18446744073709551615</faceId><cost>3</cost></nextHop>
    <nextHop><faceId>277</faceId><cost>3</cost></nextHop>
    <nextHop><faceId>262</faceId><cost>16</cost></nextHop>
    <nextHop><faceId>273</faceId><cost>74</cost></nextHop>
  </nextHops>
</fibEntry>

The FaceId 18446744073709551615 is static_cast<uint64_t>(INVALID_FACE_ID).

Such FaceId does not appear in the RIB.