Re: BGP LABEL LSP

Hi

The following are the configs

R5

router bgp 100

neighbor 1.1.1.1 remote-as 100
neighbor 1.1.1.1 update-source loopback0
network 55.55.55.55 mask 255.255.255.255

R1

router bgp 100

neig 5.5.5.5 remote-as 100
neighbor 5.5.5.5 route-reflector client
nei 5.5.5.5 update source loopback0
neighbor 12.12.12.2 remote-as 200
neighbor 12.12.12.2 send label
neighbor 12.12.12.2 send community both
neighbor 3.3.3.3 remote-as 100
neig 3.3.3.3 update-source loopback0
neig 3.3.3.3 route-reflector client
neig 3.3.3.3 send label
neigh 3.3.3.3 send community both

int fa 0/1
description Connected to AS200
ip add 12.12.12.1 255.255.255.0
mpls bgp forwarding
no sh

R2

router bgp 200

neig 12.12.12.1 remote as 100
neigh 12.12.12.1 send label
nei 12.12.12.1 send community both
nei 23.23.23.3 remote-as 100
neig 23.23.23.3 send label
neigh 23.23.23.3 send community both

int fa 0/1
description Connected to R1
ip add 12.12.12.1 255.255.255.0
mpls bgp forwarding

int fa 0/2
description Connexted to R3
ip add 23.23.23.2 255.255.255.0
mpls bgp forwarding

R3

router bgp 100
nei 23.23.23.2 remote-as 200
nei 23.23.23.2 send label
nei 23.23.23.2 send community both

nei 1.1.1.1 remote-as 100
nei 1.1.1.1 update sour loopback0
nei 1.1.1.1 send comm both
nei 1.1.1.1 send label

THere is also one more doubt

What is the differecne between Send Label to a iBGP neighbor and eBGP
neighbor

On Tue, Dec 11, 2012 at 8:32 PM, Darlington Ngaiso <ngaissod_at_gmail.com>wrote:

> Hi
>
> Can you please send the config on the routers in question.
>
> regards
>
> On Tue, Dec 11, 2012 at 5:26 PM, Routing Freak <routingfreak_at_gmail.com>wrote:
>
>> 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
>>
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>>
>>
>>
>>
>>
>>
>>
>

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