[c-nsp] Cisco MultiLink PPP

[McCallum, Robert]

Robert McCallum 
CCIE #8757 R&S
01415663448
07818002241 

> -----Original Message-----
> From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
> Sent: 24 March 2005 11:34
> To: Lawrence Wong; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Cisco MultiLink PPP
> 
> 
> Lawrence Wong <> wrote on Thursday, March 24, 2005 9:16 AM:
> 
> > I am thinking of combining 2 x T1 (1.5Mbps) into a
> > larger pipe of 3Mbps for greater capacity via MLPPP.
> > 
> > I would like to check if MLPPP is supported on all
> > Cisco platforms with Serial interface or is it only
> > supported on selected platforms.
> 
> It is supported on all low- to mid-end routers up to and 
> including 7500, check the release notes and/or feature 
> navigator for higher-end as well as hardware-based platforms
> 
> > Under MLPPP, will traffic be distributed amongst both
> > links (i.e. I can download at max of 4Mbps) or am I
> > limited to the max of each link (i.e. I can download
> > at max of 2Mbps).

You missed the start there Oli - its 2 * T1s which equals 3 meg max.

> 
> A single session can use up to 4Mbps. MLPPP will distribute 
> the packets over both links making sure to preserve the 
> packet sequence.
> 
> > How processor intensive is MLPPP?
> 
> In halfway recent code it is CEF switched and 2x2Mbps should 
> be a non-issue.. You can optimize by disabling fragmentation, 
> but it should not be needed to do this.
> 
> > Are there any caveats to look out for?
> 
> you want to make sure the delay over both links is somewhat 
> equal. Otherwise MLPPP could run out of buffers trying to 
> reassemble fragments or preserving the packet order. 
> 
> 	oli
> 
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