QTECH SmartEdge 100 PPP and PPPoE - Manual (Page 13)

Multilink PPP
2 Multilink PPP
Multilink PPP (MLPPP) is an extension to PPP that allows a peer to use
more than one physical link for communication. When using more than one
physical link to connect two peers, you need a mechanism to load balance the
connection across the two (or more) links in the bundle. MLPPP is used to
fragment the datagrams and send them across the multiple links in the bundle
in a way that achieves optimum use of the media.
Both ends of the point-to-point links must be capable of supporting MLPPP
connections. The two ends configure the data link by swapping Link Control
Protocol (LCP) packets during a link establishment phase. If MLPPP is not
successfully negotiated by the two ends of the link, MLPPP is not enabled
for the connection.
MLPPP is implemented on the router in four forms:
1 MLPPP using PPP-encapsulated ATM PVCs
Using this form of MLPPP, you do not create the MLPPP bundles;
instead, the SmartEdge OS creates them dynamically, using the endpoint
discriminator sent by the peer during the LCP negotiation and the
subscriber name to determine whether to create a new MLPPP bundle or
add the session to a current MLPPP bundle. The configuration for this
form of MLPPP and the constituent ATM PVCs is described later in this
document in Section 3.1.7 on page 14.
2 MLPPP for Layer 2 Tunneling Protocol (L2TP) subscribers
Using this form of MLPPP, you do not create the MLPPP bundles;
instead, the SmartEdge OS creates them dynamically, using the endpoint
discriminator sent by the peer during the LCP negotiation and the
subscriber name to determine whether to create a new MLPPP bundle or
add the session to a current MLPPP bundle.
To use this form of MLPPP, you must use ports configured on a GE traffic
card that has a packet processing ASIC (PPA) version 2 (PPA2) on the
LNS. You must also use ports configured on a GE traffic card on the L2TP
access concentrator (LAC). The configuration for this form of MLPPP and
the constituent L2TP tunnels is described later in this document, in Section
3.1.9 on page 15. For more information about L2TP and MLPPP for L2TP
subscribers, see the document, Configuring L2TP.
3 MLPPP using PPPoE
Using this form of MLPPP, you do not create the MLPPP bundles;
instead, the SmartEdge OS creates them dynamically, using the endpoint
discriminator sent by the peer during the LCP negotiation and the
9 64/1543-CRA 119 1170/1 Uen K | 2012-12-04