From: ccie candidate (ccie1@xxxxxxxxx)
Date: Tue Jul 23 2002 - 17:30:50 GMT-3
no-redistribution option is to prevent the ABR/ASBR from redistributing routes
into the NSSA (remember this is a stub area anyway ). the ABR will still conver
t those routes into LSA5 and send them inside the OSPF domain , but not inside
the NSSA itself .
if you dont use the no-summary option with the no-redistribution , then you may
have to use default-route-originate to propagate a default route inside your N
SSA .( if no-summary is not used , this default will not propgate )
i hope this helps .
--On Tue, 23 Jul 2002 19:57:17 Anthony Pace wrote: >Is this correct: If you had an ASBR which was an ABR and used NSSA with >"no-redistribute" you would stop the LSA-7 routes from being pushed >into downstraem routers of the NSSA but the LSA-7 routes would go into >Area-0 and change into LSA-5 and the NSSA could still get the "LSA-3 >0.0.0.0" via this ABR if the "no-summary" was used? > >OR are you saying that "no-redistribution" simply keeps the LSA-7 >routes from going into area 0, thereby isolating them to the NSSA? (in >which case I understood it backwards) > >Anthony Pace > > >On Mon, 22 Jul 2002 13:00:50 -0700, "ccie candidate" <ccie1@lycos.com> >said: >> ok ; >> the NSSA is similar to stub area , where only LSA3 (inter-area ) can >> propagate inside the area , No LSA4 $ 5 is allowed. >> teh diffrenece is that when you have another routing protocol >> redistributing into the ospf domain ( something like rip or redist >> static ) and the redistributio point is one of the down stream routers >> of the NSSA , then an LSA7 will also propagate inside the area , when >> it reaches the ABR (which is propably connected to area 0) it gets >> converted into LSA5 and propagate inside the domain . >> >> here are some tips . >> 1-NSSA is does not propagate default route back to the down steam >> routes unless you add NO-Summary option >> area 30 nssa no-summary >> >> 2-when you have the ABR is also ASBR , you have another two options for >> that command >> >> no-redistribution , will not allow the router to convert lsa7 to lsa5 >> >> default-orginate , will propagate a default when the no-summary is not >> used . >> >> hope this helps >> >> >> >> -- >> >> On Mon, 22 Jul 2002 11:28:21 >> Khurram Khani wrote: >> >Look for scenario when NSSA ABR is also ASBR. It generates both Type 5 and >> >Type 7 LSAs. >> > >> >Thanks >> >Khurram >> >----- Original Message ----- >> >From: "Louis Young" <tonyblair@etang.com> >> >To: <ccielab@groupstudy.com> >> >Sent: Monday, July 22, 2002 2:25 AM >> >Subject: Any tips when doing OSPF NSSA stuff? >> > >> > >> >> Hi all ,I was bewildered by some senarios about OSPF NSSA stuff,anyone ca n >> >offer some general tips?
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