Re: Type-4 LSA and NSSA

doesnt the ABR between A0 and A1 orginate the LSA4... giving details
abt the ASBR in the A1.? so wht i read from jeff doyle is that...
outside the area where ASBR is there... u will see type 4 LSA!? am i
correct?
Thanking You

Yours Sincerely

Divin Mathew John
divinjohn_at_gmail.com
divin_at_dide3d.com
http://www.dide3d.com
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Sent from Bengaluru, Karnataka, India

On Sat, May 9, 2009 at 12:02 PM, Jason Alex <amr.ccie_at_gmail.com> wrote:
> Hey narbick,
> You said that you will se an LSA type 3 in area 2 , why we
> didn't see LSA type 4 on area 0 ?
>
> Thanks
>
> On Sat, May 9, 2009 at 5:22 AM, Narbik Kocharians <narbikk_at_gmail.com> wrote:
>
>> I agree with Scott, but look at the following scenario:
>>
>> Area 0 ------ Area 1
>>
>> If area 1 has an ASBR and its configured as an NSSA, none of the routers in
>> the entire domain will see LSA type 4. Whereas,
>>
>> Area 2 ------ Area 0 ------ Area 1
>>
>> You will see an LSA type 4 in Area 2.
>>
>> On Fri, May 8, 2009 at 5:57 PM, Scott Morris <
>> smorris_at_internetworkexpert.com
>> > wrote:
>>
>> > Type 4's are used for next hop reachability to get to the Type 5 LSAs
>> > (ASBR). If you have no Type 5's, you have zero need for a Type 4 LSA.
>> :)
>> >
>> > So I'd suggest that someone messed up in the book?
>> >
>> >
>> >
>> >
>> > *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,
>> >
>> > JNCIE-M #153, JNCIS-ER, CISSP, et al.
>> >
>> > JNCI-M, JNCI-ER
>> >
>> > smorris_at_internetworkexpert.com
>> >
>> >
>> > Internetwork Expert, Inc.
>> >
>> > http://www.InternetworkExpert.com <http://www.internetworkexpert.com/> <
>> http://www.internetworkexpert.com/>
>> >
>> > Toll Free: 877-224-8987
>> >
>> > Outside US: 775-826-4344
>> >
>> >
>> > Knowledge is power.
>> >
>> > Power corrupts.
>> >
>> > Study hard and be Eeeeviiiil......
>> >
>> >
>> >
>> >
>> >
>> > Mike Leske wrote:
>> > > Hi group,
>> > >
>> > > can someone please give a hint on this?
>> > >
>> > > I have problems to understand why OSPF LSA Type-4 should be allowed
>> > within
>> > > NSSA's.
>> > >
>> > > According to Routing TCP/IP, Vol. 1, page 389, Type-4 LSA's are allowed
>> > to
>> > > be sent into NSSA's.
>> > > Cisco (
>> > >
>> >
>> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094a88.shtml
>> > )
>> > > gives a similar description:
>> > > After you define Area 1 as an NSSA, it must have these characteristics:
>> > > - No Type 5 LSAs are allowed in Area 1
>> > >
>> > > Cisco further defines Type-3 and Type-4 LSA's are not sent into Totally
>> > > NSSA's.
>> > >
>> > > Does it make sense?
>> > > As we know, LSA Type-4 describe ASBR's; but if the information about
>> > > external routes is blocked, there's no need to have Type-4 LSA's.
>> > >
>> > > When I Lab this up, the NSSA router indeed has NO Type-4 LSA pointing
>> to
>> > an
>> > > ASRB within Area 0.
>> > >
>> > > Thus, in which scenario will I ever see Type-4 LSA's within a NSSA?
>> > >
>> > > Thanks in advance.
>> > >
>> > > Mike
>> > >
>> > >
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>>
>>
>> --
>> Narbik Kocharians
>> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>> www.MicronicsTraining.com <http://www.micronicstraining.com/>
>> www.Net-Workbooks.com <http://www.net-workbooks.com/>
>> Sr. Technical Instructor
>>
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Received on Sat May 09 2009 - 12:06:05 ART