Hi all Sinppet from http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#qone
Why are loopbacks advertised as /32 host routes in OSPF? *A. *Loopbacks are considered host routes in OSPF, and they are advertised as /32. For more information, refer to section 9.1 of RFC 2328<http://www.ietf.org/rfc/rfc2328.txt> [image: leavingcisco.com]. In Cisco IOS Software Releases 11.3T and 12.0, if the *ip ospf network point-to-point* command is configured under loopbacks, OSPF advertises the loopback subnet as the actual subnet configured on loopbacks. ISDN dialer interface advertises /32 subnet instead of its configured subnet mask. This is an expected behavior if *ip ospf network point-to-multipoint*is configured. This statement is applicable only when the loopback address is not configured with subnet mask of 255.255.255.255, right? With regards Kings
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