Re: vpn label understanding required

This is the LFIB, once the router has assigned a label it will not re-use
it. That's why they call it a per-platform label space.

On Thu, Jun 25, 2009 at 11:12 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:

> Hi,
>
>
> sh mpls forwarding-table detail
> Local Outgoing Prefix Bytes Label Outgoing Next Hop
> 21 No Label 150.1.7.7/32[V] <http://150.1.7.7/32%5BV%5D>
> 0 Fa0/0 10.1.37.7 <<<<<<<<<<<<<<
> Local Outgoing Prefix Bytes Label Outgoing Next Hop
>
> Label Label or VC or Tunnel Id Switched interface
>
> MAC/Encaps=0/0, MRU=1504, Label Stack{}
> VPN route: SW1-BB1
>
> Is that VPN LABEL 21 will be there on the packet once it reaches this
> router and it sees
>
> VPN route: SW1-BB1 and Fa0/0 10.1.37.7 .... Based on this it forwards
> the packet.
> BUT NOW A NEW Q ARISES - I m sorry for that , what makes router keep in
> record it has already given 21 label to a prefix, don't use it.
>
> Regards
> J.Daniels
>
>
> On Thu, Jun 25, 2009 at 10:21 PM, Bryan Bartik <bbartik_at_ipexpert.com>wrote:
>
>> 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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________________________________
>>>>>>>>> Subscription information may be found at:
>>>>>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> 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 <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