The MPLS-OPS Archive

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

Hi

Note : hope this OTP (out of the normal/defined  topic of this forum) will 
not cause any incovenience .

For L3 DSL whole sale :
The user is using PPPoE ,DSL MDM do the ethernet bridging (RFC 1483/2684) 
,DSLAM do ATM switching and the PPPoEoAll5 end at the BAS .
The BAS , encapsulate the PPP into L2TPv2 to the edge router at the NSP 
(Netw Service Provider).
The discovery phase of PPPoE mandate that the BAS to get involved (RFC 3817) 
in this phase .


Possible change using  L2TPv3  :

The PPPoEoAll5 end at the BAS .
The BAS have 2 option :
1-Strip the Ethernet frame and encapsulate over L2TPv3 carrying Ethernet 
frame .
2-Relay the ATM cell over L2TPv3 carring ATM cell

in both option the BAS is totally transparent to the PPPoe Discovery phase 
,ie: more scalable .
option 1 , we can C/C the action of BAS as simple bridging (between a VCC 
and Session ID ).
option 2 , we can C/C the action of BAS as simple atm switching (between a 
VCC and session ID )

We can extend the model further , the L3 Wholsale (The NAP) can replace the 
BAS with just
PE , say PE1 .
PE1 now have the 2 option :
3-Strip the Ethernet frame and encapsulate over MPLS ethernet  Psuedo wire 
to PE2 .
4- Relay the ATM cell over MPLS ATM psuedo wire to PE2 .

PE2 inteface with the NSP edge router either through Ethernet interface 
(option 3 ) or ATM interface (option 4) , where the later is more scalable 
(Vlan nbr limitation ) .
The advantage that the NAP do not have to invest in specific eqpt (the BAS) 
, normal existing PE will do .

My question :
1- Is the above is workable .
2- is it make sense to switch from the traditional way to the way proposed 
above .
2- is it adopted by any L3 NAP ??

Brgds

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