Re: RFC 4591 and RFC 4349: DLCI at egress LCCE

Carlos,

Each CE decides the DLCI by itself (and dinamically for switched virtual 
circuits, sopported by HDLCoPW).

How may you know if both CEs use different DLCIs?. If you want to use 
HDLCoPW, you would need to ensure that.

Thanks,

Javi


El 16/06/2010 5:45, Carlos Pignataro (cpignata) escribió:
> Javi,
>
> If the DLCIs are different then you cannot use the HDLCoPW. Or a 
> different way, for port mode DLCIs need to match (it is extending a 
> port) and for different DLCIs you need FRoPW.
>
> Thanks,
>
> Thumb typed by Carlos Pignataro.
>
> On Jun 15, 2010, at 7:29 PM, "Javi" <[email protected]> wrote:
>
>> Carlos,
>>
>> I agree, but I don't understand why. If a Frame Relay circuit is 
>> transported over a L2TPv3 HDLCoPW, the egress LCCE builds a FR frame 
>> with the same DLCI as the FR frame received by the ingress LCCE. If 
>> DLCI has local significance, CE/ingress_LCCE may use a different DLCI 
>> as CE/egress_LCCE. Why is not required here that the egress LCCE 
>> re-writes the DLCI (although it's not visible to PW)?.
>>
>> Thanks,
>>
>> Javi
>>
>>
>>
>> Carlos Pignataro (cpignata) escribió:
>>> Javi,
>>>
>>> Because the "port mode" does not have granularity/visibility into the
>>> DLCI level.
>>>
>>> Thanks,
>>>
>>> -- Carlos.
>>>
>>> -----Original Message-----
>>> From: [email protected] [mailto:[email protected]] On
>>> Behalf Of Javi
>>> Sent: Tuesday, June 15, 2010 1:46 PM
>>> To: [email protected]
>>> Subject: [L2tpext] RFC 4591 and RFC 4349: DLCI at egress LCCE
>>>
>>> + Frame Relay traffic transported in a "virtual circuit-to-virtual 
>>> circuit" mode by L2TPv3 FRPW: Due to local significance of the DLCI, 
>>> the
>>>
>>> egress LCCE re-writes the DLCI.
>>>
>>>     RFC 4591 (L2TPv3 FRPW), clause 5
>>>     The Frame Relay frame is transported in its entirety, including the
>>>
>>> DLCI ...  The egress LCCE re-writes the DLCI...
>>>
>>> + Frame Relay traffic transported in a "port" mode by L2TPv3 HDLCoPW 
>>> (RFC 4349): It's not mentioned any DLCI modification at the egress 
>>> LCCE.
>>>
>>> Why is it not necessary here (similarly, DLCI significance is local)?
>>>
>>> Javi
>>> _______________________________________________
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>>
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