Re: vpn label understanding required

Thanks Bryan :)
got it
Regards
J.Daniels
On Thu, Jun 25, 2009 at 10:49 PM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:

> 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 <http://www.ipexpert.com/>

Blogs and organic groups at http://www.ccie.net
Received on Thu Jun 25 2009 - 22:52:50 ART