From: Pun, Alec CL (Alec.CL.Pun@pccw.com)
Date: Mon Dec 02 2002 - 08:17:53 GMT-3
Hi adam,
Thanks. But I read from cisco ospf design guide
(http://www.cisco.com/warp/public/104/1.pdf) that LSA Type 4 is generated by
ABR instead. So I am really confused.
alec
-----Original Message-----
From: Adam Crisp [mailto:adam.crisp@totalise.co.uk]
Sent: Monday, December 02, 2002 7:06 PM
To: Pun, Alec CL; Surendran; 'Tom Young'; ccielab@groupstudy.com
Subject: RE: OSPF lsa type
Hi,
This is probably some help to you!
Type 1 = Router Link Advertisements , generated by every router.
Type 2 = Multi-access segment Network Link Advertisements , generated by DR
Type 3 = Summary Link Advertisements. Summary, generated by the ABR for
EVERY type 1,2. Type 3 can be generated to describe a summary for a bigger
lump of addresses. Works in both directions, so that a Type 3 from Area 1,
can traveres the backbone and go into say Area 2. Depends upon your
configuration.
Type 4 = Summary Link Advertisements. Generated by ASBR.
Type 5 = Autonomous System (AS) External Link Advertisements. Generated by
ASBR.
Type 7 = Not-So-Stubby Areas (NSSA). Generated by external route sources
within a NSSA, or by the ABR ro a NSSA area.
A type 5 is what you'd see for you external routers as long as you weren't
in a NSSA area, where you'd see a type 7 instead. the ABR for the NSSA area
does a type 5 to type 7 conversion. This ABR might let in the type 3's from
the other area. All depends upon the configuration of the router.
Good luck
Adam
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Pun, Alec CL
Sent: 02 December 2002 10:37
To: Surendran; 'Tom Young'; ccielab@groupstudy.com
Subject: RE: OSPF lsa type
how about LSA Type 4 ?
I am not sure it will be solely originated by ABR or also from ASBR.
alec
-----Original Message-----
From: Surendran [mailto:surenv@hpssk211.sgp.hp.com]
Sent: Monday, December 02, 2002 2:28 PM
To: 'Tom Young'; ccielab@groupstudy.com
Subject: RE: OSPF lsa type
It is more like this
LSA Type 5 is external routers by ASBR
LSA Type 7 is by NSSA
Suren
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tom Young
Sent: Sunday, December 01, 2002 8:39 PM
To: ccielab@groupstudy.com
Subject: OSPF lsa type
Hi group
Sorry for a very simple question, the ospf LSA type 3,4
are all generated by ABR, and the type 7 is originated by
ASBR, right ?
thanks alot
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