Re: VPNV4 Next Hop path manipulation querry

I took Mahesh's topology as being

IGP (OSPF in this case) within AS12 and AS34 for loopbacks and
internal-AS networks

ipv4 eBGP between R1-R3 and R2-R4 using directly connected + send-label
ipv4 iBGP between R1-R2 and R3-R4 using loopbacks and set
next-hop-self + send-label

vpnv4 eBGP between R1-R3 and R2-R4 using loopbacks and ebgp-multihop
vpnv4 iBGP between R1-R2 and R3-R4 using loopbacks and set next-hop-self

LDP between R1-R2 and R3-R4

To satisfy requirement 1 - I set local-pref 10000 to ipv4 routes
inbound from AS12 (R1) on R3
To try and satisfy requirement 2 - I set weight 10000 for only R2
Loopback inbound from AS12 (R2) on R4

On Tue, Jul 21, 2009 at 12:46 PM, Rich Collins<nilsi2002_at_gmail.com> wrote:
> There is no intra-AS vpnv4 peering?
>
> On Tue, Jul 21, 2009 at 1:28 PM, Con Spathas<ccie19226_at_googlemail.com> wrote:
>> Gday Mahesh,
>>
>> I've been toying with your question this morning.
>>
>> This might break your first requirement, however on R4 I manipulated
>> the weight for R2 loopback learned from R2 so that it prefers the
>> R4-R2 path instead of the R4-R3-R1-R2 path. R4 is still honoring
>> getting to AS12 via R3 for everything except the loopback for R2. I
>> figure by using weight - this is locally significant to R4 and won't
>> influence the rest of AS34.
>>
>> That's where I'm not sure if doing this on R4 breaks your first
>> requirement or actually addresses your second requirement and still
>> satisfies the first requirement
>>
>> I'd be interested in reading other people's thoughts on this.
>>
>> Cheers.
>> Con.
>>
>> On Tue, Jul 21, 2009 at 8:11 AM, mahesh s<maheshsachitanandan_at_gmail.com> wrote:
>>> Hi,
>>>
>>> I am looking for a solution for VPV4 route path control
>>>
>>> Scenario,
>>>
>>> R1- -(AS12) - - -R2
>>> | |
>>> | |
>>> | |
>>> R3- --(AS34) - - R4
>>>
>>>
>>> R1- R3 & R2- R4 ( IPV4 EBGP Peering on the the directly connected link)
>>>
>>> R1-R2 & R3-R4 ( IPV4 BGP peering is on the Loopback)
>>>
>>>
>>> Inter AS, VPNV4 peering is between the loopback ( R1-R3 & R2-R4) and not on
>>> the directly connected link.
>>>
>>> I am able to achieve , as well as able to bring up the LSP this using IPV4
>>> BGP + Send lables
>>> ----------
>>> *Requirement*
>>>
>>> 1. Primary path for the IPV4 BGP traffic flow between from AS 34 to AS12
>>> through R3
>>>
>>> 2. VPNV4 Customer Site is on R2 and any customer site in AS 34 to use R4
>>> as primary exit
>>> ----------
>>> Unable to find a way to achieve the requirement 2 as the underlying IPV4 BGP
>>> ( Carrying the transport label uses R3 as primary exit)
>>>
>>> Any suggestions VPNV4 backdoor or changing/manipulating the path for a VPNV4
>>> neighbor
>>>
>>> Thanks for your help
>>>
>>> Mahesh
>>>
>>>
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Received on Tue Jul 21 2009 - 13:06:42 ART