[j-nsp] MX RE how fast is slow

[Mark Tinka]

On Saturday, September 10, 2011 09:17:41 PM Drew Weaver 
wrote:

> With all of this talk of how slow the MX80's RE is it got
> me wondering what is a fast RE?
> 
> For instance (and this is a bad example because it's
> old..) on my PRP-2s it takes about 5-6 minutes before it
> settles after a link flap.
> 
> Just wondering how fast it should/could be and which
> routers have the fastest RE.

Depends on what "fast" means to you:

	1. Do you mean route crunching?

	2. Do you mean configuration display?

	3. Do you mean configuration saves?

	4. Do you mean regex processing?
	
	5. Do you mean system boot-up?

	6. e.t.c.


In general, for us, the worst-performing control/management 
engines I've found for various tasks are:

	a) 6500/7600 SUP720.
	b) 1st generation CRS RP.
	c) RE-850 for M7i/M10i (these days)
	d) ASR1000 RP1
	e) EX3200/4200


The faster control/management engines (in general terms), 
with a moderately-sized configuration and a recent OS 
release, for us, have been:

	a) NPE-G2/7201.
	b) RE-A-2000 (not as good as I hoped, but...).
	c) 1st generation ASR9000 RP
	d) ME3600X/3800X


Of course, this is all very subjective, and I wish I had a 
more scientific measurement approach than this. But the 
variables are simply too many and every network would have 
unique configuration components that affect 
control/management engine performance in different ways.

Having said all that, with the exception of the NPE-G2/7201, 
all these are hardware-based platforms, so the 
control/management engines don't take part in the forwarding 
process (more true for Juniper than mainstream Cisco 
products). So it's a fair trade-off :-).

Of course, I haven't tried the multi-chassis systems, the 
JCS-type deployments or the new 64-bit engines from Juniper 
and others, so those could be much better by a mile-and-a-
half.

YMM definitely V.

Cheers,

Mark.
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