Re: BGP LABEL LSP

Brian

As i told, i dont have the access to the routers now. it is a production
router where u can get only for a day.
I just want to know how BGP LSP works and i havent found any single
document in cisco doc.

It is not Inter AS L3VPN or CSC. Intra AS VPN over InterAS

 iBGP connection over eBGP is the order of the day.

If someone find , pls reply me.THanks

On Thu, Dec 13, 2012 at 10:00 PM, Brian McGahan <bmcgahan_at_ine.com> wrote:

> No offense but you cant expect anyone to help troubleshoot your issue
> unless you post the output relevant to the issue. The configuration alone
> is not enough to infer what the current state of your topology is. If you
> still want help with the problem post the outputs that I mentioned on each
> of the routers.****
>
> ** **
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)****
>
> bmcgahan_at_INE.com****
>
> ** **
>
> Internetwork Expert, Inc.****
>
> http://www.INE.com****
>
> ** **
>
> *From:* Routing Freak [mailto:routingfreak_at_gmail.com]
> *Sent:* Thursday, December 13, 2012 8:58 AM
> *To:* Darlington Ngaiso
> *Cc:* Brian McGahan; Marko Milivojevic; Cisco certification; Brian Dennis
> *Subject:* Re: BGP LABEL LSP****
>
> ** **
>
> Joe****
>
> ** **
>
> I know about PHP, but i m not sure whether BGP LSP will have PHP enabled
> or not by default as there is no MPLS enabled anywhere.****
>
> ** **
>
> Brian****
>
> ** **
>
> sh ip route shows me the route****
>
> ** **
>
> sh ip bgp labels shows me the labels for the prefixes with the > best path
> enabled on it.****
>
> ** **
>
> sh mpls forwarding has also the labels associated with it.****
>
> ** **
>
> But it is not properly programmed in CEF , i dont see it in CEF table.****
>
> ** **
>
> ** **
>
> ** **
>
> On Thu, Dec 13, 2012 at 1:44 PM, Darlington Ngaiso <ngaissod_at_gmail.com>
> wrote:****
>
> Hi ****
>
> ** **
>
> Did you manage to send the output of the commands below.****
>
> ** **
>
> Are you trying to Simulate CsC or this is a scenario at work.****
>
> ** **
>
> regards****
>
> ** **
>
> On Tue, Dec 11, 2012 at 11:08 PM, Brian McGahan <bmcgahan_at_ine.com> wrote:*
> ***
>
> Post the following:****
>
> ** **
>
> show ip route****
>
> show mpls forwarding****
>
> show ip bgp labels****
>
> show ip cef w.x.y.z****
>
> ** **
>
> Where w.x.y.z is the destination in question.
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)****
>
> bmcgahan_at_INE.com****
>
> ** **
>
> Internetwork Expert, Inc.****
>
> http://www.INE.com****
>
>
> On Dec 11, 2012, at 11:20 AM, "Routing Freak" <routingfreak_at_gmail.com>
> wrote:****
>
> 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)****
>
>
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> ****
>
> ** **
>
>
>
> ****
>
> ** **
>
> --
> Regards****
>
> Routing Freak CCIE#35889 (SPv3)****
>
> ** **
>
> ** **
>
>
>
> ****
>
> ** **
>
> --
> Regards****
>
> Routing Freak CCIE#35889 (SPv3)****
>
> ** **
>

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