There are two types of issues that need be addressed when looking at
protecting routing protocols from misconfigurations and malicious
attacks. The first is authentication and certification of routing
protocol information. The second is denial of service attacks
resulting from repetitive origination of the same router
advertisement or origination of a large number of distinct
advertisements resulting in database overflow. Note that both of
these concerns exist independently of a router's support for the NSSA
option.(http://tools.ietf.org/html/rfc3101)
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Sajid Ali Pathan
