[c-nsp] Multihop L2TP resource usage

[Dennis Peng]

In 12.2(13)T and later, multihop'ed sessions no long consume an IDB on
the "middle" LNS. We use something called the Subscriber Service
Switch architecture to switch the packets for multihop sessions. It
should consume equal or less resources then a session terminating on
the box itself. 

Dennis

Sam Stickland [sam_ml at spacething.org] wrote:
> Hi,
> 
> Has anyone got any references or real-world experience on the resources 
> comsumed by multihop L2TP?
> 
> In this configuration
> 
> LAC - LNS1 - LNS2
> 
> the worse case senario appears to be that a L2TP session terminating at 
> LNS2 would consume twice as many resources on LNS1 as a session 
> terminating at LNS1 (since LNS2's sessions are terminated and 
> re-encapsulated at LNS1).
> 
> Is this actually what happens in reality, or are there optimisations that 
> are made? And if so, are they only available in certain IOS trains/IOS 
> configurations?
> 
> Thanks,
> 
> Sam
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