Re: OSPF and BGP query

HI Marc

When u redistribute a route into bgp , the next hop will be ur neighbor
address and no tthe IGP next hop
Can u check and tel me. I just checked it now. ?

Any one tried in lab set up.

On Tue, Jul 31, 2012 at 4:35 AM, marc abel <marcabel_at_gmail.com> wrote:

> OSPF NSSA will only convert a route redistributed into the NSSA as a type
> 7. For External routes (type 5) received within OSPF it just filters these.
> It won't generate a default route unless you specify area x nssa
> default-information originate. So in your scenario R1 would have
> no reach-ability to the redistributed rip route.
>
> When a router originates a BGP route configured with a *network *router
> configuration command or through route redistribution (*redistribute
> *router
> configuration command), it sets the BGP next hop to the IGP next hop (the
> same value you d find in the IP routing table). BGP next hop is set to
> 0.0.0.0 for routes with unknown next hops connected interfaces, static
> routes to *null 0 *or summary routes configured with *aggregate-address
> *router
> configuration command.
>
> Hope that helps,
>
> Marc
>
> On Mon, Jul 30, 2012 at 10:18 AM, Routing Freak
> <routingfreak_at_gmail.com>wrote:
>
> > 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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>
> --
> Marc Abel
> CCIE #35470
> (Routing and Switching)
>
>
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CCIE#29992 (Security)
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