Re: Clarification in NSSA

[Vivek Dubey <[e-mail]>]

Hi minto,
Got it.... was missing one line there.

thanks,
vivek


On Mon, 30 Jun 2003 Jeyanath Minto J - CTD, Chennai. wrote :
>hi vivek ,
>       yes, R2 should originate Type 5 (which is a result of Type
>7
>translation).
>Please read  the translation algorithm again (section 3.2 step
>(2) ).
>
>Cheers
>Minto Mascarenhas
>**********************************************************************
>*  Internet IS for everyone - but it won't be unless WE make it
>so   *
>**********************************************************************
>-----Original Message-----
> From: Vivek Dubey [mailto:[e-mail]]
>Sent: Monday, June 30, 2003 10:56 AM
>To: [e-mail]
>Subject: Re: Clarification in NSSA
>
>
>Hi Minto,
>The question here is whether R2 on seeing functionally equv
>Type 5 LSA from R3 (translated previously before being
>stopped) should originate Type 5 (which is a result
>of Type 7 translation).
>
>There is no doubt as far as who is translator, its R2
>only.
>
>thanks,
>vivek
>
>
>
>On Sat, 28 Jun 2003 Jeyanath Minto J - CTD, Chennai. wrote :
> >hi vivek,
> >    In section 3.2  step (2) clearly mention this. R3 already
>out
> > from the
> >List of NSSA border Routers and , now R2's router Id is
>higher
> >than anyone (
> >Actually R2 alone in that List ). As result, R2 will
>translate
> >LSAs.
> >
> >Cheers
> >Minto Mascarenhas
> >**********************************************************************
> >*  Internet IS for everyone - but it won't be unless WE make
>it
> >so   *
> >**********************************************************************
> >
> >-----Original Message-----
> > From: Vivek Dubey [mailto:[e-mail]]
> >Sent: Saturday, June 28, 2003 1:44 PM
> >To: [e-mail]
> >Subject: Re: Clarification in NSSA
> >
> >
> >Hi,
> >The point krishna is trying to make:
> >1) R3 goes down
> >2) R2 gets elected as translator
> >3) But R2 while translating Type 7 to Type 5
> >     sees functionally equv Type 5 previously
> >     translated by R3 (before being stopped).
> >     Note R3 router id is higher.
> >     So R2 doesn't originate Translated Type 5.
> >4) So both R2 and R1 hold Type 5 generated by
> >     R3 before it went down (no flushing was done
> >     by R3 before going down).
> >5) Consequently R1 will loose routes to those
> >     Type 7 networks (calculated using Translated
> >     Type 5 by R3).
> >6) But R2 will hold routes as it is directly connected
> >     to NSSA area and can use Type 7 for getting to those
> >     networks.
> >
> >This can happen in real networks.
> >Probably Pat can clarify how to handle such
> >scenarios.
> >
> >thanks,
> >vivek
> >
> >
> >On Fri, 27 Jun 2003 Jeyanath Minto J - CTD, Chennai. wrote :
> > >hi Krishna,
> > >     R2 maintain a List of this area's Nssa border Routers
> >and
> > >ASBR.
> > >Translator is Elected from this List.
> > >     so , when u stopped the R3 , R2 removes the R3 from
>the
> > >List. And R2
> > >will elect itself as a Translator ( because R3 is
>unreachable
> >)
> > >and
> > >translate type 7 to Type 5.
> > >
> > >
> > >
> > >Cheers
> > >Minto Mascarenhas
> >
> >**********************************************************************
> > >*  Internet IS for everyone - but it won't be unless WE
>make
> >it
> > >so   *
> >
> >**********************************************************************
> > >
> > >-----Original Message-----
> > > From: Krishna Rao [mailto:[e-mail]]
> > >Sent: Friday, June 27, 2003 11:50 AM
> > >To: [e-mail]
> > >Subject: Clarification in NSSA
> > >
> > >
> > >Hi
> > >
> > >I am basically testing RFC 3101 NSSA implementation. I find
> > >that
> > >routes are missing in the Router (not in NSSA area) but is
> > >conected to the Router in NSSA area through backbone area.
> > >
> > >
> > >Topology Used in Testing
> > >========================
> > >   |-------------------------------|
> > >   |                               |
> > >   |                               |
> > >   |                               |
> > >R1-------------R2---------------R3
> > >                  |                |
> > >                  |                |
> > >                  |                |
> > >             --------------------------- NSSA area 0.0.0.1
> > >                         |
> > >                         |
> > >                         |
> > >                         R4
> > >                         | area 0.0.0.1
> > >                         |Import External Routes.
> > >                         |
> > >
> > >There are 2 areas in this Topology -
> > >NSSA area 0.0.0.1 (R2, R3 and R4)
> > >Remaining all the networks are in backbone area.
> > >
> > >R1 is connected to R2 and R3 through backbone area. R2 and
>R3
> > >are
> > >connected through backbone area.
> > >
> > >RouterID of R1 10.0.0.1
> > >RouterID of R2 20.0.0.1
> > >RouterID of R3 30.0.0.1
> > >
> > >R3 is elected as Translator. Import external routes at R4.
>R1
> > >holds the external routes.
> > >
> > >Now, stop the router R3. R2 takes over as Translator.
> > >
> > >BUT, now R1 doesnot hold the external routes.
> > >
> > >I expect the R1 to hold the external routes. But as per RFC
> > >3101
> > >since R2 holds LSA generated by R3 which is of higher
> >RouterID,
> > >R2
> > >doesnot generate Type 5 LSAs. Is it correct. If this is the
> > >case,
> > >then R1 would never hold the external routes.
> > >
> > >Your response on this would be highly appreciated.
> > >
> > >Thanks & Regards
> > >Krishna
> > >
> > >
> > >
> > >
> > >
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Click below to experience Sooraj Barjatya's latest offering
'Main Prem Ki Diwani Hoon' starring Hrithik Roshan,
Abhishek Bachchan & Kareena Kapoor http://www.mpkdh.com