Re: vpn label understanding required

Jack,

"Show mpls forwarding-table detail" shows the label, prefix and the VRF.

On Thu, Jun 25, 2009 at 10:43 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:

> Hi,
>
> If that is the case , so router must be keeping a database of label to VRF
> , how can we see that ....( command)
>
> Regards
> J.Daniels
>
> On Thu, Jun 25, 2009 at 10:01 PM, Bryan Bartik <bbartik_at_ipexpert.com>wrote:
>
>> Yes, that is right.
>>
>>
>> On Thu, Jun 25, 2009 at 10:25 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:
>>
>>> Hi,
>>>
>>> so it means LFIB lookup is done , which sees [V] VPN label and forwards
>>> to the appropriarate VRF. so if a router has 200 VRF and each VRF is
>>> orignating 2 routes so it means 400 UNIQUE LABELS will identify which VRF to
>>> forward the traffic.
>>>
>>> Regards
>>> J.daniels
>>>
>>> On Thu, Jun 25, 2009 at 9:28 PM, Bryan Bartik <bbartik_at_ipexpert.com>wrote:
>>>
>>>> Jack,
>>>>
>>>> I see what you mean, good question. If you so "show mpls fowarding-table
>>>> detail" you will see the VPN. I think this would be a function of looking up
>>>> the label in the LFIB when the prefix is listed with [V].
>>>>
>>>>
>>>> On Thu, Jun 25, 2009 at 9:47 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I got that but my querrie still stands - let me put it other way
>>>>>
>>>>> ( 1.1.1.0/24)CE1--VRF <http://1.1.1.0/24%29CE1--VRF>K--PE1----P1----PE2----CE2
>>>>> packet from CE2 reaches PE1 with VPN label , now what will hapen ....
>>>>> will router say it has stamp of label Y which is for VRF X ?
>>>>>
>>>>> Regards
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Jun 25, 2009 at 8:45 PM, Bryan Bartik <bbartik_at_ipexpert.com>wrote:
>>>>>
>>>>>> Jack,
>>>>>>
>>>>>> Yes, each prefix learned in the VRF would have a different label. I
>>>>>> would not associate labels with VRFs, but rather with the prefix learned in
>>>>>> the VRF. The bottom label corresponds to the egress PE, the inner label
>>>>>> corresponds to the prefix in the VRF.
>>>>>>
>>>>>> On Thu, Jun 25, 2009 at 7:06 AM, jack daniels <
>>>>>> jckdaniels12_at_gmail.com> wrote:
>>>>>>
>>>>>>> Hi group,
>>>>>>>
>>>>>>> I have routers
>>>>>>>
>>>>>>> ( 1.1.1.0/24)CE1--VRF <http://1.1.1.0/24%29CE1--VRF>K--PE1----P1----PE2----CE2
>>>>>>>
>>>>>>> now when pkt is forwarded from CE2 for 1.1.1.0/24 it has VPN label
>>>>>>> Y. On
>>>>>>> reaching PE1 it sees label Y = VRF K....
>>>>>>> so it means that if a router has 2000 vrf on it , so it will asign
>>>>>>> unique
>>>>>>> labels per vrf for each prefix to advertise in vrf ?
>>>>>>>
>>>>>>> Regards
>>>>>>> J.Daniels
>>>>>>>
>>>>>>>
>>>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Bryan Bartik
>>>>>> CCIE #23707 (R&S), CCNP
>>>>>> Sr. Support Engineer - IPexpert, Inc.
>>>>>> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Bryan Bartik
>>>> CCIE #23707 (R&S), CCNP
>>>> Sr. Support Engineer - IPexpert, Inc.
>>>> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>>>>
>>>
>>>
>>
>>
>> --
>> Bryan Bartik
>> CCIE #23707 (R&S), CCNP
>> Sr. Support Engineer - IPexpert, Inc.
>> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>>
>
>

-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net