From: Ramesh Ramasamy (ramesh_ramasamy@xxxxxxxxxxx)
Date: Fri Apr 13 2001 - 12:24:20 GMT-3
Hi Curtis,
Thanks for the specific info:
"You cannot have an LS database for an area you aren't a member
of, you can have summary LSAs of course or external LSAs that originate for
a different area, but you cannot have area-scope (router and network) LSAs.
"
I was thinking about the VL on the area0 ABR for area4 - but failed to
understand that am (area1 ABR) not actually a member of area4 !!
You were also correct on the choice of viewing the age of the LSA. I was
more into seeing inside the LSP on which router links of a specifc area are
coming through.. when they get sent! maybe it is asking too much! thought
it will be a good tool to do some troubleshooting!
Thanks for your inputs - it definitely helped me clarifying things some
more.
Ramesh.
>From: Curtis Call To: "Ramesh Ramasamy" CC: ccielab@groupstudy.com Subject:
>Re: few OSPF Questions.. Date: Fri, 13 Apr 2001 09:00:53 -0600
>
>Answers inline
>
>At 10:45 PM 4/12/01, you wrote:
>>Hi All,Its 'OSPF time' for questions...Thanks for your
>>inputs...Ramesh.-------------1.OSPF: My understanding is every rtr on a
>>specific area will have the map of all the rtrs pertaining to that
>>area.Connection: are0-area1-area4; On area 0 ABR/router, I have the VL
>>configured thro' area1 ABR - which also has the area4 interface. Since i
>>do authentication on VL, i have the 'area 0 auth mess' configured on the
>>area1 ABR. So if i give 'show ip ospf data' - am seeing area 0, area 1 and
>>area 4 info here. I dont see area 4 info on the are0 ABR when I give the
>>'show ip os dat'Is this an exception for area4 because of VL?
>
>Let me see if I understand you correctly, you have three routers, one in
>area 0 and area 1 (ABR), one in area 1 and area 4 with a VL to area 0, and
>one just in area 4 with a VL to the ABR in area 1? And your question is why
>can't you see area 4 info on the area 0 router? Well it's because that
>router isn't in area 4. If you have an ABR in area 4 then it will have two
>seperate link state area databases one for area 0 and one for area 4,
>however your ABR in area 0 will have just link state databases for area 0
>and area 1. You cannot have an LS database for an area you aren't a member
>of, you can have summary LSAs of course or external LSAs that originate for
>a different area, but you cannot have area-scope (router and network) LSAs.
>
>>--------------------------------------------------------------2.i am
>>looking to view the rtng updates thro some ospf debug command - as i could
>>see in the 'debug ip rip'. some command that will output the actual
>>'network' rather than DBD that i see in the debug 'ip ospf adj'. i cant
>>see this due to link state packets? may be there is a hidden command like
>>the 'ip ospf monitor' toread into the lsp's???? Thanks,Ramesh.
>
>Why not just use show ip ospf database >external>? That will show you what
>router is claiming what. I cannot see why it would be advantageous to see
>an LSA coming in and to read it right then, I believe the show ip ospf
>database will tell you the age of the LSA anyway so you'll know when it
>showed up.
>
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