From: Howard C. Berkowitz (hcb@xxxxxxxxxxxx)
Date: Mon Aug 05 2002 - 16:36:01 GMT-3
At 1:02 PM -0400 8/5/02, Peter van Oene wrote:
>both of you are making the same point. If a router is an NSSA ASBR
>and ABR, it has the choice of advertising externals into both, or
>one of the connected areas (in theory) This command is simply
>allowing this external information to be shield from the stub area
>if you desire it to be which is the point both of you seem to have
>made.
I believe, Grasshopper, that one of the signs of Network-Mastery is
when two adepts can have a screaming agreement.
>
>At 09:36 AM 8/5/2002 -0700, ying c wrote:
>>Hi,
>>
>>That's not what it said in
>>
>>http://www.cisco.com/warp/public/104/nssa.html
>>
>>Below is from the web page's Filtering in NSSA
>>section:
>>
>>
>>"There are situations where there is no need to inject
>>external routes into the NSSA as type 7. This
>>situation usually occurs when an ASBR is
>>also an NSSA ABR. When redistribution takes place in
>>this scenario, the router generates type 5 as well as
>>type 7 LSAs. You can prevent the
>>router from creating type 7 LSAs for NSSA using the
>>following command:
>>
>> router ospf 1
>> area 1 nssa no-redistribution
>>
>>In the network diagram above, area 1 is configured
>>using the no-redistribution option. This means that
>>all IGRP routes are redistributed into
>>area 0, but no type 7 LSAs are generated for area 1.
>>Only configure this command on an NSSA ASBR that's
>>also an ABR."
>>
>>Chang
>>
>>--- "Volkov, Dmitry (Toronto - BCE)"
>><dmitry_volkov@ca.ml.com> wrote:
>>>
>>> Hi,
>>>
>>> "no-redistribution" will not sent lsa 5 into nssa.
>>> ABR/ASBR will sent only lsa 5 to area 0.
>>>
>>> Dmitry
>>>
>>> -----Original Message-----
>>> From: ying c [mailto:bf5tgh1@yahoo.com]
>>> Sent: Sunday, August 04, 2002 10:59 PM
>>> To: Jaspreet Bhatia; ccielab@groupstudy.com
>>> Subject: Re: NSSA Type 7 to Type 5 question
>>>
>>>
>>> Hi,
>>>
>>> See this page:
>>>
>>> http://www.cisco.com/warp/public/104/nssa.html
>>>
>>> 'not-advertise' means do not advertise type 7
>>> outside
>>> of the NSSA. i.e. type 7 LSA stays in the NSSA area
>>> and not to leak out to the rest of OSPF areas.
>>>
>>> There's another option 'no-redistribution' which
>>> only
>>> apply to a router that happens to be an NSSA ABR and
>>> NSSA ASBR, by default this router will generate both
>>> type 5 and type 7 LSAs into NSSA, this option will
>>> save a little bit bandwidth and only send type 5
>>> into
>>> NSSA.
>>>
>>> HTH,
>>> Chang
>>> --- Jaspreet Bhatia <jasbhati@cisco.com> wrote:
>>> > Hello Folks,
>>> > When we get type 7
>>> LSAs
>>> > converted into Type 5
>>> > LSAs at the NSSA ABR . there is an option to
>>> control
>>> > which type 7 LSA does
>>> > not get converted into a type 5 LSA .
>>> >
>>> > summary-address prefix mask not-advertise
>>> >
>>> > I did not understand the working of this command .
>>> > Can anyone throw some
>>> > light on it ?
>>> >
>>> > TIA
>>> >
>> > > Jaspreet
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