From: Sean C (Upp_and_Upp@hotmail.com)
Date: Wed May 18 2005 - 12:39:20 GMT-3
See if you can access NMC's public pdf files - I know there is a document
that discusses this. The .pdf is titled "Forwarding behavior of IGP routing
protocols on the broadcast part I". I'd send the link but I don't think
it'll work. I'm including the .pdf for Dennis and Anthony but I recognize
GS will scrub the attachment.
Honestly, I've never used 0.0.0.0 for a wildcard mask in production or
testing environments (partly due to this doc). It may be a case of tomato
vs. tomato (uhhh - that sounds better than it reads), but I'll always use
the proper mask. Typically, I'll just cut-and-paste what is under the
interface and let the router do the translating.
HTH,
Sean
R3#sh run int loop 103
interface Loopback103
ip address 172.16.103.1 255.255.255.0
end
R3#conf t
R3(config)#router osp 10
R3(config-router)#network 172.16.103.1 255.255.255.0 area 20 <--I just copy
and pasted the interface command
R3(config-router)#end
R3#show run | begin ^router
router ospf 10
network 172.16.103.0 0.0.0.255 area 20
> ----- Original Message -----
> From: "Anthony Sequeira" <terry.francona@gmail.com>
> To: "Dennis J. Hartmann" <dennisjhartmann@hotmail.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Wednesday, May 18, 2005 11:13 AM
> Subject: Re: OSPF 0.0.0.0 wildcard (inverse) mask
>
>
>>I would love to hear the reasoning behind this - for the Practical Lab
>> - I plan on using the 0.0.0.0 wildcasrd mask exclusively unless I am
>> told to do otherwise!
>>
>> On 5/18/05, Dennis J. Hartmann <dennisjhartmann@hotmail.com> wrote:
>>> Someone E-Mailed me a white paper on why you should never use 0.0.0.0
>>> as
>>> a wildcard mask a while ago. I have misplaced it and I have a friend
>>> interested in taking a look at it. If anyone has this .pdf or a link to
>>> the
>>> explanation on cisco.com, can you please send it? Thanks.
>>>
>>> Sincerely,
>>>
>>> Dennis J. Hartmann
>>>
>>> White Pine Communications
>>>
>>> dh8@pobox.com
>>>
>>> CCSI#23402/CCIP/CCNP/CCDP/CCNA/CCDA
>>>
>>> Cisco IP Voice Support & Design Specialist
>>>
>>> Cisco Optical, VPN & IDS Specialist
>>>
>>> MCSE
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
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