The MPLS-OPS Archive

["M. ELK" <elkou141061@hotmail.com>]

Som

Guess U are transporting ethernet .
draft-ietf-pwe3-ethernet-encap-06.txt indicate the following :
The use of control Word is optional .
the first 16 bits is zero , the rest 16 bit is for the sequence nbr .
if the sequence nbr is zero , it mean it is not used .
For the box U are using , it insert a control word but set all fileds to 
zero .
the control word is always 4 bytes for all type of encapsulation .
To check the use of control word and it's structure in certain encap , U 
have to check the draft addressing this specific encapsulation .

Brgds

>From: somasundaram <somu_0007@yahoo.com>
>To: mpls-ops@mplsrc.com
>Subject: [MPLS-OPS]: L2 vpn Date: Mon, 17 May 2004 22:19:25 -0700 (PDT)
>
>Hi,
>we have made a lab setup  to knw about l2/l3 Vpn.The setup is like
>
>traffic generater(ce)--PE---P-------P---PE---Traffic gen(ce)
>
>we are sniffing the data between the P devices.
>
>  And we have found that L3 Vpn is looks in generic fromat as below
>
>Mac layer--->mpls (outer label)-->mpls(inner label)---> ip layer
>
>when we test with L2 VPN(ethernet vlan-ccc) the we found format as
>below
>
>(network) MAC layer--->mpls outer label----mpls inner label--->00 00 00
>00---> customer MAC layer---IP layer.
>
>My query is wht is these 4byes of zero's .... is it control word.
>
>1)is it standard 4byes ????? for all types of encapsulation.????.
>
>2)wht will be the value fo these control word for diff encapsulation
>like ppp-ccc,hdlc-ccc,for FR-ccc
>
>3) and one more question will this conrol word will be there in TCC
>also.
>  if yes wht will be the value and size of the control word.???
>
>soms
>
>
>
>
>
>---------------------------------
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