[j-nsp] system maximums for the M and MX series routers

[Alexandre Snarskii]

On Sun, Oct 12, 2008 at 11:24:08AM +0200, sthaug at nethelp.no wrote:
> >  I need to know the maximum number of L2 and L3VPN supported on MX and M
> > series routers.
> 
> There is no "System maximums" document for the M / MX series, as far as
> I know. We use both M, MX and ERX, and our experience is that parts of
> the ERX "System maximums" should be taken with a large grain of salt.

I'd rather disagree with last statement. 
Well, our setup is quite different, we're using ERX'es just as they 
supposed to be used (BRAS, PPPoE concentrators in our case), and, as far 
as we can see their System Maximums is quite accurate in that setup.. 

And I appreciate Juniper for publishing them - well, every piece of 
hardware has it's hardware limitations, and to know what are they before
real-life deployment is much better then discovering 'ad hoc'.. 

Back to System Maximum for M-/MX-series: I'd also be interested
in that document, especially in the part concerning new (JunOS 9.1+) 
'Subscriber Access' feature. Just some quick questions, which are
covered fully (and accurately, as far as I can tell) for ERX, but
not for J/M/MX series: 
- how many subscribers can be hadled per chassis (or per fpc, or per
port if it's fpc/port-wide parameter) ? 
- how many policers can be attached to subscribers (again, per fpc/port) ? 

> On the other hand, for those cases where we have been able to get real
> numbers from Juniper for the M / MX series, our experience is that these
> numbers reflect reality much better than the ERX numbers.
> 
> For an ERX example, the "System maximums" for JunOSe 9.2.0 states that
> the ERX-310 supports a maximum of 1000 virtual routers (or 1000 VRFs)
> per chassis. Our experience is that with anything close to a realistic
> configuration, where some of the VRFs use DHCP relay, this limit is much
> lower, on the order of 150 or so.
> 
> Getting back to the M / MX: The maximum number of L2 and L3VPN supported
> will depend on a number of factors, for instance number of prefixes and
> nexthops, and also on the amount of memory in your forwarding complex
> (M7i / M10i can have either 128 MB or 256 MB on the CFEB. The difference
> is rather significant).
> 
> The only simple answer is, "it depends...".
> 
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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