Re: OSPF configuration explanation Lookpback 0

From: Edouard Zorrilla (ezorrilla@tsf.com.pe)
Date: Tue Jan 30 2007 - 11:33:42 ART


Thanks a lot Ronnie,

Regards
  ----- Original Message -----
  From: Ronnie Angello
  To: Edouard Zorrilla
  Cc: ccielab@groupstudy.com ; security@groupstudy.com
  Sent: Tuesday, January 30, 2007 8:38 AM
  Subject: Re: OSPF configuration explanation Lookpback 0

  The default OSPF network type on a loopback interface is LOOPBACK, which
must be advertised as /32. The point-to-point network type forces OSPF to
advertise the subnet address of the loopback.

  Ronnie

  On 1/30/07, Edouard Zorrilla <ezorrilla@tsf.com.pe> wrote:
    Hello Group,

    Is there any explanation why when I set the interface loopback 0 as a "ip
ospf
    network point-to-point":

    Rack1R2(config)#int lo0
    Rack1R2(config-if)#ip ospf network point-to-point

    It is being learned as a /24 instead a /32:

        150.1.0.0/24 is subnetted, 2 subnets
    O 150.1.2.0 [110/65] via 163.1.12.2, 00:00:05, Serial0/3/0
    Rack1R1#

    I mean which caracteristic of the point-to-point network make it is being
    shown as a /24 ?

    Regards

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