>I am trying to get my Digiboard Datafire card to Bond with an Ascend
>Router. I have been told (by Digiboard) that the Ascend Routers do not
>support MPP, but that Ascend is working on this. My Internet Provider
>does not really understand what MPP is - or why I need it to bond -
>neither do I. Can anyone out there tell me (or point me towards) what
>is MPP. Is it really a Standard? Is it true that Ascend Routers do not
>currently support MPP? When might they support MPP?
There is a standard called "The PPP Multilink Protocol (MP)". It is
documented RFC 1717. It is useful for getting more than 64Kbit/sec from
combinations of modems, ISDN links, leased lines, and/or wet string.
Based on traffic this newsgroup, Ascend has a protocol called MPP. It
is a proprietary multilink protocol very similar to MP, reportedly an
extension of MP. It is not clear to me whether it interoperates with
systems using MP.
MP involves chopping packets into smaller packets called fragments and
distributing them over the links in the multilink bundle, and reassembly
the fragments into packets at the far end based on 2- or 4-byte headers
in the fragments.
BONDING is something else entirely, involving sending individual bytes
over links in the bundle, but only after the relative delays of the
individual links have been measured. BONDING involves recovering the
ordered stream of bytes that make up the circuit (i.e. data, voice or
whatever) at the far end based on when the bytes come out of the individual
BONDING is the sort of solution you would expect the telephony guys to
come up, with while MP is what you would expect the packet switching
guys to produce. For data packets, I think MP is the better approach,
but I'm probably biased.