[j-nsp] OSPF LSAs

[Krasimir Avramski]

Hi,

If there is ospf export policy configured, even not actually exporting routes ( for example because of inactive state ) the E bit is set in ASBR router LSA. ABR notice E bit and generate ASBRSum LSA in other areas.

Krasi

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---Original Message----------------------------------
 FROM: mink at schlund.net
 TO: juniper-nsp at puck.nether.net
 SUBJECT: Re: [j-nsp] OSPF LSAs
 SENT: APRIL 28, 2005 09:54AM
--------------------------------------------------------
> 
> 
> 
> Hi,
> 
> I've a combination of OSPF LSAs in the database of a router
> which looks strange to me, maybe somebody can give me a hint:
> 
>  > show ospf database asbrsummary
> 
>      OSPF link state database, area 0.0.0.4
>   Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
> ASBRSum *AAA.BBB.CCC.1    AAA.BBB.CCC.30   0x80000b84  2783  0x2  0x440a  28
> ASBRSum *AAA.BBB.CCC.2    AAA.BBB.CCC.30   0x80000b44  2755  0x2  0x1f64  28
> ASBRSum *AAA.BBB.CCC.35   AAA.BBB.CCC.30   0x80000037  2727  0x2  0x373f  28
> 
>  > show ospf database extern
>      OSPF AS SCOPE link state database
>   Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
> Extern   0.0.0.0          AAA.BBB.CCC.1    0x80005cc3  2324  0x2  0x8a94  36
> Extern   0.0.0.0          AAA.BBB.CCC.2    0x80007f86   379  0x20 0xd148  36
> 
> 
> Can somebody explain to me why there is a ASBR-Summary-LSA
> for AAA.BBB.CCC.35 in the database, but no external LSA from
> that router.
> 
> Maybe I just need a lesson in OSPF but so far an ASBR was a router, which
> imports a route into OSPF, thus creates an external LSA...
> 
>     tschuess
>               Stefan
> --
> Stefan Mink, Schlund+Partner AG (AS 8560)
> Primary key fingerprint: 389E 5DC9 751F A6EB B974  DC3F 7A1B CF62 F0D4 D2BA
> 
> Content-Description: OpenPGP digital signature
> 
> 
> 
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