The MPLS-OPS Archive

["Bob Arthurs" <bob_arthurs@hotmail.com>]

Yep, that's the control word. It's optional for some encap types, but for 
others such as frame it's mandatory. In frame, the control word carries 
becn, fecn, de, and c/r bits. If you have sequencing turned on for the 
pseudowire then that'll be carried in the control word too.

you'll have to read the draft to get more on this- it's a little to much 
info for an email :)


>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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