From: ccie candidate (ccie1@xxxxxxxxx)
Date: Wed Jul 24 2002 - 01:07:06 GMT-3
hi ;
the routes will still propagate into the normal areas but not to the NSSA as i
explained in my previous email .
check this one .
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r/ip
rprt2/1rdospf.htm#xtocid79693
the default route will propagate as LSA7 into the NSSA from the ABR/ASBR router
.
check the same link again .
hope is helps .
--On Tue, 23 Jul 2002 16:45:59 Scott Livingston wrote: >I wont answer for Anthony, but chime my own understanding. > >The "no-redistribute" used on the ABR/ASBR will allow LSA type 5's in >all other area's but the NSSA. The type 5's are only converted to type >7 if heading into a NSSA as a result of NOT configuring >"no-redistribute". > >The ABR/ASBR that has the "no-redistribute" command riding on it does >not convert the type 5 LSA's to type 7 - I do believe, as they are not >heading into a NSSA. Although it will convert type 7 --> type 5 when >heading out of the NSSA; with "no-redistribute" configured or not. > >Also, if you configure the "default-information-originate" on an ASBR >you will need to configure a default route 0.0.0.0/0. This rule does >not apply to an ABR. But now I am going to head to the lab late tonight >because I don't know how the "default-information-originate" works if >you configure it on an ABR/ASBR :); do you still have to configure a >default route 0.0.0.0/0 on a router acting as an ABR/ASBR? Or do you >configure it only when it is an ASBR? HHMMMM? If anyone can answer this >one for me I'd surely appreciate it! > >Scott >Sprint E|Solutions > >-----Original Message----- >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of >Anthony Pace >Sent: Tuesday, July 23, 2002 2:57 PM >To: ccie candidate; Louis Young; ccielab@groupstudy.com; Khurram Khani >Subject: Re: Any tips when doing OSPF NSSA stuff? > >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 can >> >offer some general tips?
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