[j-nsp] M40 and Multilink PPP

[Nils Swart]

Hi James & Erdem,

> For MLPPP you need one of the following PIC's:
>
> Link Services PIC
> AS-PIC (Adaptive Services PIC)
>
> I guess this is same for all Juniper M-Series hardware, besides some
> M7i with ASM bundle.

Exactly, since everything related to forwarding of packets is done in 
hardware instead of being processed using a CPU, this brings two things to 
the table: wire-rate & predictable performance for normal forwarding of 
packets, but inflexibility in special processing of packets (IPSEC, GRE, 
Multilink PPP).

Service PICs like the Adaptive Service PIC (or onboard module in an M7i as 
mentioned by Erdem) solve this. Traffic is sent into an AS-PIC, gets 
processed (encrypted, tunneled, stateful firewalled, etc), and comes 
back to the packet forwarding engine to be shipped  off to it's final 
destination.

(Ps.: Adaptive Services PICs are called adaptive since they can be 
programmed to do a variety of stuff, as opposed to an ML-PIC or Encryption 
services PIC that can only perform one task; before you go off and buy any 
of these, you'd best contact your juniper tech guy to check if you've got 
supported hardware)

Regarding performance, Michael's mentioned 800 Mbps is related to tunnel 
(GRE,logical/virtual tunnel) capacity only; not to IPSEC,MLPPP or SFW. 
(which is about OC-3 worth of bandwidth on the onboard ASM in an M7i)

-Nils


>
> Cheers,
> Erdem
>
>> -----Original Message-----
>> From: juniper-nsp-bounces at puck.nether.net
>> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
>> James Sneeringer
>> Sent: Monday, March 28, 2005 9:43 PM
>> To: juniper-nsp at puck.nether.net
>> Subject: [j-nsp] M40 and Multilink PPP
>>
>> hardware: M40 (not M40e)
>> software: JunOS 4.4R3.4
>>
>> The JunOS manual indicates that a separate Multilink Services
>> PIC is required for Multilink PPP to be available.  Am I
>> reading this right?
>> There's no way to do ML-PPP without this PIC?
>>
>> -James
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> http://puck.nether.net/mailman/listinfo/juniper-nsp
>>
>
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