8. Security Considerations

Questa sezione conserva il testo RFC per Unreachable Prefix Announcement (UPA), inclusi IS-IS and OSPF signaling, U-Flag and UP-Flag semantics, propagation rules, IANA assignments e security considerations.

8.  Security Considerations

   The use of UPAs introduces the possibility that an attacker could
   inject a false, but apparently valid, UPA.  However, the risk of this
   occurring is no greater than the risk today of an attacker injecting
   any other type of false advertisement.

   The risks can be reduced by the use of existing security extensions
   as described in:

   *  [RFC5304], [RFC5310], and [RFC7794] for IS-IS.

   *  [RFC2328], [RFC7474], and [RFC7684] for OSPFv2.

   *  [RFC5340], [RFC4552], and [RFC8362] for OSPFv3.