This is only applicable for the CCIE exam as loopbacks are used to generate networks
If you have a Loopback as follows interface Loopback0 ip address 192.168.1.1 255.255.255.0 And you add the above to OSPF it will show up as 192.168.1.1/32 If you have a question that asks you to see that as a network not a host you would need to interface Loopback0 ip ospf network point-to-point It will then show up in the routing table as 192.168.1.0/24 Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor - IPexpert, Inc. Mailto: <mailto:[email protected]> [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: <http://www.ipexpert.com/chat> www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at <http://www.ipexpert.com/communities> www.ipexpert.com/communities and our public website at <http://www.ipexpert.com/> www.ipexpert.com From: [email protected] [mailto:[email protected]] On Behalf Of Kingsley Charles Sent: Monday, August 23, 2010 6:23 AM To: Yogesh Gawankar Cc: [email protected] Subject: Re: [OSL | CCIE_Security] ip ospf network point-to-point under loopback interface with ospf Hi Yogesh I am asking this for cases like DMVPN, GETVPN where we advertise loopback interfaces. But if we clear CCIE security, then definitely R & S would be easier as without knowing R&S, we can't clear CCIE Security :-) After Security, next is R&S for me.... With regards Kings On Mon, Aug 23, 2010 at 3:26 PM, Yogesh Gawankar <[email protected]> wrote: Hi kings yes you are right.By the way have you started studying for R/s track too? :) This sounds more like an R/S question. Thanks and regards Yogesh Gawankar --- On Mon, 8/23/10, Kingsley Charles <[email protected]> wrote: From: Kingsley Charles <[email protected]> Subject: [OSL | CCIE_Security] ip ospf network point-to-point under loopback interface with ospf To: [email protected] Date: Monday, August 23, 2010, 7:22 PM Hi all Sinppet from http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094 704.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> leavingcisco.com <http://www.cisco.com/images/exit.gif> . 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 -----Inline Attachment Follows----- _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
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