Re: OSPF and BGP query

Thats because only ASBR generate type 7 lsa's

On Mon, Jul 30, 2012 at 7:15 PM, Mohammad Khalil <eng_mssk_at_hotmail.com>wrote:

> You will not have routes on R1 for the RIP originated routes on R5 unless
> u configure R2 to originate a default route
>
> R1#sh ip route ospf
> 2.0.0.0/32 is subnetted, 1 subnets
> O IA 2.2.2.2 [110/65] via 10.1.12.2, 00:08:37, Serial0/0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/129] via 10.1.12.2, 00:06:58, Serial0/0
> 10.0.0.0/24 is subnetted, 3 subnets
> O IA 10.1.23.0 [110/128] via 10.1.12.2, 00:07:16, Serial0/0
> O IA 10.1.34.0 [110/192] via 10.1.12.2, 00:00:51, Serial0/0
>
> R2(config)#router ospf 1
> R2(config-router)#area 2 nssa default-information-originate
>
> R1#sh ip route ospf
> 2.0.0.0/32 is subnetted, 1 subnets
> O IA 2.2.2.2 [110/65] via 10.1.12.2, 00:10:52, Serial0/0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/129] via 10.1.12.2, 00:09:13, Serial0/0
> 10.0.0.0/24 is subnetted, 3 subnets
> O IA 10.1.23.0 [110/128] via 10.1.12.2, 00:09:31, Serial0/0
> O IA 10.1.34.0 [110/192] via 10.1.12.2, 00:03:06, Serial0/0
> O*N2 0.0.0.0/0 [110/1] via 10.1.12.2, 00:00:03, Serial0/0
>
> R1#sh ip cef 5.5.5.5
> 0.0.0.0/0, version 23, epoch 0, cached adjacency to Serial0/0
> 0 packets, 0 bytes
> via 10.1.12.2, Serial0/0, 0 dependencies
> next hop 10.1.12.2, Serial0/0
> valid cached adjacency
>
> R1#sh ip ospf database
>
> OSPF Router with ID (1.1.1.1) (Process ID 1)
>
> Router Link States (Area 2)
>
> Link ID ADV Router Age Seq# Checksum Link count
> 1.1.1.1 1.1.1.1 827 0x80000003 0x001533 3
> 2.2.2.2 2.2.2.2 826 0x80000004 0x007BD8 2
>
> Summary Net Link States (Area 2)
>
> Link ID ADV Router Age Seq# Checksum
> 2.2.2.2 2.2.2.2 831 0x80000001 0x00A085
> 3.3.3.3 2.2.2.2 725 0x80000001 0x00F4EC
> 10.1.23.0 2.2.2.2 743 0x80000001 0x00E8E3
> 10.1.34.0 2.2.2.2 358 0x80000001 0x00F18F
>
> Type-7 AS External Link States (Area 2)
>
> Link ID ADV Router Age Seq# Checksum Tag
> 0.0.0.0 2.2.2.2 175 0x80000001 0x00D0D8 0
>
> BR,
> Mohammad
>
> > Date: Mon, 30 Jul 2012 20:48:43 +0530
> > Subject: OSPF and BGP query
> > From: routingfreak_at_gmail.com
> > To: ccielab_at_groupstudy.com
> >
> > Hi all
> >
> > I have a set up like this
> >
> >
> > R1---------R2----------R3----------R4------R5
> >
> >
> >
> > R1------R2===NSSA Area 1
> >
> > R2--------R3====Backbone Area 0
> >
> >
> > R3------------R4 ===== Normal area 2
> >
> >
> >
> > R4---------R5======== RIP
> >
> >
> > I am redistributing RIP routes on R4 into OSPF .. Whether R2 will convert
> > this into Type 7 LSA and send it to the NSSA Area or else it will
> generate
> > default route.
> > because Type 5 LSA are not allowed in NSSA Area..
> >
> >
> >
> > 2.. BGP Scenario
> >
> >
> > R1----------R2------------R3--------------R4
> >
> > R1---------R2 ==== OSPF
> >
> > R2----------R3 ===== EBGP . R2 is in AS 10 , R3 is in AS 20
> >
> > R3-----------R4 ======EBGP R4 is in AS 30
> >
> >
> > When R2 is redistributing OSPF routes into BGP, what will be next hop
> found
> > in R3 , it is the R2 neighbor address or else the IGP next hop to the
> OSPF
> > route.
> >
> > Bit confused with this logic.
> >
> > Thanks in advance,
> >
> >
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Received on Mon Jul 30 2012 - 19:17:20 ART