Re: BGP LABEL LSP

Hi Marko

I can see that the route is not using BGP LSP. I am seeing that it is
taking only the IP Path and not the LSP path.

I want the traffic to go into LSP and not take the Ip routing path.

I am not seeing that BGP LSP is formed from R3 to R1.

On Tue, Dec 11, 2012 at 9:52 AM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> What happened when you labbed it up?
>
> --
> Marko Milivojevic - CCIE #18427 (SP R&S)
> Senior CCIE Instructor - IPexpert
>
> :: This message was sent from a mobile device. I apologize for errors and
> brevity. ::
>
> On Dec 10, 2012, at 18:00, Routing Freak <routingfreak_at_gmail.com> wrote:
>
> Anybody get this ? ANy thoughts on this ?
>
>
>
>
> On Mon, Dec 10, 2012 at 10:41 PM, Routing Freak <routingfreak_at_gmail.com>wrote:
>
>> Hi
>>
>> I have a topology like this
>>
>> ____________ibgp______________
>>
>> R5------------------R1-------------------R2-----------------------R3
>> ibgp ebgp ebgp
>>
>>
>> R1 and R3 are running iBGP in AS 100 and R1 and R2 are running eBGP with
>> R2 in AS 200 and respectively R2 and R3 are eBGP neighbors.
>>
>> There is no physical connection between R1 and R3 . There is an iBGP peer
>> between R1 and R3 via R2 which is a eBGP peer with both R1 and R3
>>
>> Now R1 is a RR and R5 and R3 are clients
>>
>> MPLS is enabled between R1 and R2 and R2 and R3. But there is no LDP or
>> RSVP enabled on those interfaces.I have just enabled the forwarding place
>> saying that this interface can receive labelled packets.
>>
>> R3 is learning R5's routes via R1's iBGP connection with a next hop as R5.
>>
>> R5's loopback is advertised as ebGP route to R2 from R1 and it is passed
>> to R3 from R2 as eBGP route.
>>
>> Now when R1 is sending as Ipv4 Unicast routes with Labels on it. ( with
>> Send label option ) to R2.
>>
>> R2 is also having the send label in the eBGP peering with R3 .
>>
>> So now for R3 to reach R5s loopback there it should use a label sent from
>> eBGP neighbor R2.
>>
>> So now here is the problem part. I dont have a label for the prefixes (
>> ie R5 advertised prefixes ) and i only have the next hop which is R5
>> loopback label ( ie advertised by R2 to R3 ) .
>>
>> So when R3 is sending traffic to R5's prefixes, will it use the BGP label
>> to R2 and R2 will use the BGP label to reach R1 and then R1 will strip the
>> label and do a normal routing lookup to send traffic to R5
>>
>> Will BGP label forms an LSP ?. When a next hop in a BGP table is again
>> learned by BGP, will it use the BGP label to send the traffic ?
>>
>> Without the prefix label , will only the next hop BGP label will work to
>> form LSP ?
>>
>>
>>
>>
>>
>

-- 
Regards
Routing Freak CCIE#35889 (SPv3)
Blogs and organic groups at http://www.ccie.net