From: Mike Dickson (Mike@dicksonnetworks.com)
Date: Mon Jul 19 2004 - 21:00:45 GMT-3
Check to see if there are any requirements (BGP, tunnel, VPN, etc)
concerning connectivity between the loopback interfaces, remembering
that OSPF will always prefer intra-area routes.
For instance, you might have 2 routers, each with an interface in area 1
and area 2. The path through area 1 may be across an Ethernet LAN, and
the path through area 2 involves an ISDN interface. If the loopbacks
are placed in area 2, then traffic between the loopbacks will pass
through area 2, even though the best path is through area 1.
Mike Dickson
CCIE #12281 (Routing & Switching, Security), MCSE+Internet, MCDBA
Dickson Network Designs
(512) 422-3192 voice (512) 394-0320 fax
www.dicksonnetworks.com
-----Original Message-----
From: diptish doshi [mailto:diptishdoshi007@yahoo.com]
Sent: Monday, July 19, 2004 8:57 AM
To: ccie2be; Geert Nijs; jb; Kenneth Wygand; James
Cc: ccielab@groupstudy.com
Subject: Re: Put the loopback in appropriate Area or Routing Domains
.....
hey guys ,
i guess the conversation is leading a different direction .... what
i meant to ask is ... the lab scenerio have not specified where( which
area ) ... so i just need to know is there any thumb rule or any logic
behind it.... cause when i glance at the answer configuration sometimes
they are in area 0 and sometimes they are not ... so i just need to
know ..
how critical is this placement of loopback IP in a particular area ...
I hope im clear this time ...
thanx everyone ..
diptish
--- ccie2be <ccie2be@nyc.rr.com> wrote:
> What about the standard way?
>
> network x.x.x.x 0.0.0.0 area 0
>
> Won't the loopback retain it's original mask if this is done?
>
>
> ----- Original Message -----
> From: "Geert Nijs" <geert.nijs@simac.be>
> To: "jb" <barrerj1@hotmail.com>; "Kenneth Wygand"
> <KWygand@customonline.com>; "James"
> <james@towardex.com>; "diptish doshi"
> <diptishdoshi007@yahoo.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Monday, July 19, 2004 8:43 AM
> Subject: RE: Put the loopback in appropriate Area or Routing Domains
> .....
>
>
> > :-)
> >
> > There are three ways to advertise a loopback into
> OSPF with its original
> mask.....
> > Do you know all three of them ?
> > 1) ip ospf network point-to-point
> > 2) redistribute connected (appears as an external
> network, may not be
> allowed)
> > 3) ??? rarara
> > put the loopback into a seperate area summarize the loopback address
> > into the backbone
> :-)
> >
> > network x.x.x.x 0.0.0.0 area 20
> > area 20 range x.x.x.x 255.255.255.0 (assuming /24
> mask)
> >
> > Regards,
> > Geert
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> > jb
> > Sent: zondag 18 juli 2004 20:28
> > To: Kenneth Wygand; James; diptish doshi
> > Cc: ccielab@groupstudy.com
> > Subject: Re: Put the loopback in appropriate Area
> or Routing Domains
> > .....
> >
> >
> > Kenneth,
> >
> >
> > Original mask for loopback is /32
> >
> > the IP OSPF NETWORK point to point change this to
> /24
> >
> > I'm wondenring
> > How can I do the same without utilizing the
> mentioned above command?
> >
> > Thanks
> > Jojo
> >
> >
> >
> > ----- Original Message -----
> > From: "Kenneth Wygand" <KWygand@customonline.com>
> > To: "James" <james@towardex.com>; "diptish doshi"
> > <diptishdoshi007@yahoo.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Sunday, July 18, 2004 12:53 PM
> > Subject: RE: Put the loopback in appropriate Area
> or Routing Domains .....
> >
> >
> > > I agree with James. However, when they say
> "most appropriate area", you
> > > must also consider other criteria as well. For
> example, maybe they want
> > > you to advertise a loopback with the original
> mask, but they prohibit
> > > you from using the "ip ospf network" statement.
> You are also required
> > > to enter this network into OSPF with the
> "network" command (cannot
> > > "redistribute connected"). In this case, what
> other consideration
> > > should you keep in mind when choosing the most
> appropriate area?
> > >
> > > Kenneth E. Wygand
> > > Systems Engineer, Project Services CISSP #37102, CCNP, CCDP, ACSP,
> > > Cisco IPT Design
> Specialist, MCP, CNA,
> > > Network+, A+
> > > Custom Computer Specialists, Inc.
> > > "The only unattainable goal is the one not
> attempted."
> > > -Anonymous
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> > > James
> > > Sent: Sunday, July 18, 2004 1:17 PM
> > > To: diptish doshi
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: Put the loopback in appropriate
> Area or Routing Domains
> > > .....
> > >
> > > On Sun, Jul 18, 2004 at 08:34:42AM -0700,
> diptish doshi wrote:
> > > > hi all ,
> > > >
> > > > Many a times in ospf configurations it is
> written
> > > > " Put the loopback in the appropriate area "
> ... im a
> > > > bit confused with it ... as i dont understand
> as to on
> > > > what criteria and what scenario should i
> consider
> > > > while taking that decision ....
> > > > Same is the case when there are various
> routing
> > > > domain in the router and we have to put the
> loopback
> > > > in the " APPROPRIATE " domain ...
> > > > Can anybody guide me ... how to select
> this so
> > > > called APPROPRIATE thing .????
> > >
> > > To me, I usually interpret this statement as:
> > >
> > > "Put the loopback in the backbone area, or in
> an area that is closer
> > > toward
> > > the Backbone."
> > >
> > > -J
> > >
> > > --
> > > James Jun
> TowardEX
> > > Technologies, Inc.
> > > Technical Lead Network
> Design, Consulting, IT
> > > Outsourcing
> > > james@towardex.com Boston-based
> Colocation & Bandwidth
> > > Services
> > > cell: 1(978)-394-2867 web:
> http://www.towardex.com , noc:
> > > www.twdx.net
> > >
> > >
>
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