Editing Point-to-Point Protocol (section)

==Over several links==

=== Multilink PPP ===

'''Multilink PPP''' (also referred to as '''MLPPP''', '''MP''', '''MPPP''', '''MLP''', or Multilink) provides a method for spreading traffic across multiple distinct PPP connections. It is defined in RFC 1990. It can be used, for example, to connect a home computer to an Internet Service Provider using two traditional 56k modems, or to connect a company through two leased lines.

On a single PPP line frames cannot arrive out of order, but this is possible when the frames are divided among multiple PPP connections. Therefore, Multilink PPP must number the fragments so they can be put in the right order again when they arrive.

Multilink PPP is an example of a [[link aggregation]] technology. [[Cisco IOS]] Release 11.1 and later supports Multilink PPP. <!-- more implementation examples welcome -->

=== Multiclass PPP ===

With PPP, one cannot establish several simultaneous distinct PPP connections over a single link.

That's not possible with Multilink PPP either. Multilink PPP uses contiguous numbers for all the fragments of a packet, and as a consequence it is not possible to suspend the sending of a sequence of fragments of one packet in order to send another packet. This prevents from running Multilink PPP multiple times on the same links.

'''Multiclass PPP''' is a kind of Multilink PPP where each "class" of traffic uses a separate sequence number space and reassembly buffer. Multiclass PPP is defined in RFC 2686