Re: Next HOP on IBGP

Steve i totally mis-read the question, i am sorry. I must have been very
tired.

On Thu, Aug 20, 2009 at 8:22 PM, Steve Lyons <charter21p5_at_gmail.com> wrote:

> I tried to respond to your question the other day and had browser issues.
> My understanding is you are asking why in a MPLS VRF is the next hop the PE
> routers and not the source CE routers? If this is your question the reason
> why this is required is because MPLS routers use a dual stack (outer and
> inner) label in LDP/TDP. The outer label is source PE router advertising the
> prefix and the inner label is the prefix within the VRF. This is not the
> same scenario for non-mpls BGP networks such as a EBGP connection to an ISP
> for internet and then IBGP connections to an internal LAN.
>
> Steve Lyons
>
> On Wed, Aug 19, 2009 at 11:24 PM, Narbik Kocharians <narbikk_at_gmail.com>wrote:
>
>> May be the link is advertised in the IGP that you are running between R1
>> and R2. Some times its recommended to do that with a passive-interface to
>> provide reachability.
>>
>>
>> On Wed, Aug 19, 2009 at 8:12 PM, Steve Lyons <charter21p5_at_gmail.com>wrote:
>>
>>> On Tue, Aug 18, 2009 at 5:12 AM, Mark Stephanus Chandra <
>>> mark.chandra_at_gmail.com> wrote:
>>>
>>> > Dear GS,
>>> >
>>> >
>>> >
>>> > I have something weird going on,
>>> >
>>> >
>>> >
>>> > This is my network topology
>>> >
>>> >
>>> >
>>> > R1(AS 65000)-------R2(AS65001) ------R3(AS65001)
>>> >
>>> >
>>> >
>>> > So R1 have eBgp connection to R2 and R2 and R3 have iBGP connection.
>>> >
>>> >
>>> >
>>> > The Theory is, if R2 have routing update from R1, then the nexthop is
>>> R1
>>> > and
>>> > the update continue to R3 but cause of this iBGP Connection, the next
>>> hop
>>> > will not change and still to R1.
>>> >
>>> >
>>> >
>>> > But Now, in one of my customer network, I can see route update that
>>> come
>>> > form R1, from R3 perspective the nexthop is change to R2, and in R2 I'm
>>> not
>>> > configured Next-hop-Self.
>>> >
>>> >
>>> >
>>> > Have anyone experiencing the same like I do ?
>>> >
>>> >
>>> >
>>> > IOS bug ?
>>> >
>>> >
>>> >
>>> > FYI, this is all inside the same VRF
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > Regards
>>> >
>>> > Mark Stephanus Chandra - CCIE#23887
>>> >
>>> >
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>>
>>
>> --
>> Narbik Kocharians
>> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>> www.MicronicsTraining.com <http://www.micronicstraining.com/>
>> Sr. Technical Instructor
>>
>
>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
Blogs and organic groups at http://www.ccie.net