FRR supports enforcing Generalized TTL Security Mechanism (GTSM) where only neighbors that are the specified number of hops away will be allowed to become neighbors. This patch adds a new option to set the number of hops allowed, defaulting to 1 for strict security out of the box. Setting value to zero or less will disable GTSM. Change-Id: I1166f22fef8e3f6b825343b4e2792ce9cfb10547changes/01/770301/10
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