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RE: MP vs. MMP [7:50198] posted 07/31/2002
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>Mann, Chris wrote:
>>
>>  I am studying for the CID test and am a little fuzzy about what
>>  the main
>>  differences between MP(Multilink PPP)and MMP(Multilink
>>  Multichassis PPP).
>>  Don't they both combine ISDN B channels across multiple access
>>  servers or
>>  routers??
>
>No, only the second one combines channels across multiple access servers.
>Multilink PPP (MP) simply works to bring up both ISBN B channels on a single
>interface, for example.
>
>MP was the original enhancement to PPP that added support for basic channel
>aggregation. MP ensures that packets arrive in order at the receiving device
>through the use of sequence number. Multiple channels appear as one logical
>link to upper-layer protocols.
>
>Multichassis MP is a Cisco IOS enhancement to MP that allows channel
>aggregation across multiple remote-access servers at a central site.
>Multichassis MP allows you to group multiple access servers into a single
>stack group. User traffic can be split and reassembled across multiple
>access servers in the stack group.
>
>Multichassis MP makes use of the Stack Group Bidding Protocol (SGBP). SGBP
>defines a bidding process to allow access servers to elect a server to
>handle aggregation for an application. The server has the job of creating
>and managing a bundle of links for an application that requests channel
>aggregation.
>
>So, anyway, it all boils down to that multichassis is multi in two ways:
>multiple chassis and multilink PPP. Also, multichassis requires SGBP. It
>really helps to look at a picture. Hopefully your study materials have a
>picture. It also helps to know the history and to realize that Cisco always
>has to add enhancements and bells & whistles to the basic concept. So MP
>came first. Then Cisco made it even more complicated with multichassis MP.
;-)
>
>Priscilla


You haven't begun to get into complexity until you experience MLPPP 
over L2TP, the L2TP possibly running through IPsec.




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