Re: AToM (EoMPLS) label stack

Is tunnel label same as transport label ?

On Tue, Feb 22, 2011 at 4:01 PM, srinivas pv <vsrinivas.paturi_at_gmail.com> wrote:
> Hi,
>
> AToM generally uses 2 label stack.
>
> Top label: Tunnel label (This label is same as the one in normal IGP setup.
> Some times also called as IGP label) - This is used to carry packet to
> remote PE. This label binding info you getit from 'show mpls ldp bindings'.
>
> Bottom label: VC label/PW label - This is to identify Attachment Circuit.
> This you get it from 'show mpls l2 vc binding'. You can also check label
> stack with 'show mpls l2 vc detail'.
>
> Thanks,
> Srinivas
>
> On Tue, Feb 22, 2011 at 2:52 PM, GAURAV MADAN <gauravmadan1177_at_gmail.com>
> wrote:
>>
>> Hi All
>>
>> Sorry for asking this question .. don't have a setup to try .. If
>> someone could please clarify ..
>>
>> I am referring the AToM chapter in "MPLS config on Cisco IOS " book .
>> I am referring to Ethernet as my L2 circuit (between PE and CE) .
>>
>> The confusion is :
>>
>> 1) "sh mpls forwarding-table" as well as data plane diagram for EoMPLS
>> shows 2 labels . Outer will be MPLS label (used in MPLS core) and
>> inner will be L2 circuit Label .
>>
>> 2) But when the book talks of "how AToM works" ; it talks of something
>> like Tunnel Label and VC Label imposed by PE .
>>
>> Tunnel label : To propagate from PE-ingress to PE-egress
>> VC Label : Used by PE-Egress to get where to send frame (out which
>> interface) ::::: Just like your MPLS VPN label in L3....
>>
>> Now my query is regarding the label stack .. Can someone please tell
>> me if its a 2 label stack or a 3 label stack .
>> Can someone please tell me exact inner / outer labels .
>>
>> I will simulate this as soon as i have access to devices ,.... But if
>> someone can answer ; it will be great .
>>
>> Thanks
>> Gaurav Madan
>>
>>
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Received on Tue Feb 22 2011 - 16:25:38 ART