RE: OSPF and BGP query

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,
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Tue Jul 31 2012 - 02:15:39 ART