Re: NSSA and Totally NSSA

I though all stubby areas stopped type 4 and type 5 LSA's.

On Fri, Mar 18, 2011 at 7:39 PM, Aaron <aaron1_at_gvtc.com> wrote:

> Ahh thanks garry, I see Abr injected def rt is type 3 and also 3 & 4
> interarea RT's aren't allowed in
>
> Aaron
>
> On Mar 18, 2011, at 8:04 AM, garry baker <baker.garry_at_gmail.com> wrote:
>
> > Defining a Not-So-Stubby Area
> >
> > In order to make a stub area into an NSSA, issue this command under the
> OSPF
> > configuration:
> >
> > router ospf 1
> > *Area 1 nssa*
> >
> > This command must be configured on every single router in Area 1. After
> you
> > define Area 1 as an NSSA, it must have these characteristics:
> >
> > -
> >
> > No Type 5 LSAs are allowed in Area 1. This means no RIP routes are
> > allowed in Area 1.
> > -
> >
> > All IGRP routes are redistributed as type 7. This type 7 can only exist
> > within NSSA.
> > -
> >
> > All type 7 LSAs are translated into type 5 LSAs by the NSSA ABR and are
> > leaked into the OSPF domain as type 5 LSAs.
> >
> > Defining an NSSA Totally Stub Area
> >
> > In order to configure an NSSA totally stub area, issue this command under
> > the OSPF configuration:
> >
> > router ospf 1
> > *Area 1 nssa no-summary*
> >
> > Configure this command on NSSA ABRs only. After you define the NSSA
> totally
> > stub area, Area 1 has these characteristics in addition to the NSSA
> > characteristics:
> >
> > -
> >
> > No type 3 or 4 summary LSAs are allowed in Area 1. This means no
> > inter-area routes are allowed in Area 1.
> > -
> >
> > A default route is injected into the NSSA totally stub area as a type 3
> > summary LSA.
> >
> >
> >
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094a88.shtml#definenotstub
> > --
> > Garry L. Baker
> >
> > "There is no 'patch' for stupidity." - www.sqlsecurity.com
> > "Complexity is the enemy of reliability..."
> >
> >
> >
> > On Fri, Mar 18, 2011 at 3:39 PM, Clark, Neil <Neil.Clark_at_atosorigin.com
> >wrote:
> >
> >> Hi Guys,
> >>
> >> I think I am being a divvy I am struggling to see the main difference
> >> between NSSA and Totally NSSA. Could someone point out the key
> >> differences for me?
> >>
> >> Thanks
> >>
> >> Neil
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________________
> >> Atos Origin and Atos Consulting are trading names used by the Atos
> Origin
> >> group. The following trading entities are registered in England and
> Wales:
> >> Atos Origin IT Services UK Limited (registered number 01245534) and Atos
> >> Consulting Limited (registered number 04312380). The registered office
> for
> >> each is at 4 Triton Square, Regents Place, London, NW1 3HG.The VAT No.
> for
> >> each is: GB232327983
> >>
> >> This e-mail and the documents attached are confidential and intended
> solely
> >> for the addressee, and may contain confidential or privileged
> information.
> >> If
> >> you receive this e-mail in error, you are not authorised to copy,
> disclose,
> >> use or retain it. Please notify the sender immediately and delete this
> >> email
> >> from your systems. As emails may be intercepted, amended or lost, they
> >> are
> >> not secure. Atos Origin therefore can accept no liability for any
> errors
> >> or
> >> their content. Although Atos Origin endeavours to maintain a virus-free
> >> network, we do not warrant that this transmission is virus-free and can
> >> accept
> >> no liability for any damages resulting from any virus transmitted. The
> >> risks
> >> are deemed to be accepted by everyone who communicates with Atos Origin
> by
> >> email.
> >> _______________________________________________________
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Fri Mar 18 2011 - 20:48:17 ART