[j-nsp] MX104 capabilities question

Bill Blackford bblackford at gmail.com
Tue Jun 7 14:14:25 EDT 2016

A lot of folks have responded to this so at the risk of belaboring the
point, yes the MX104 is very slow to load the FIB or during a churn. But
forwarding performance is solid!

Port density is an issue. MX104 can hold up to 12 ports @10G and has no
issues forming LAG's across each MIC or in combination with the on-board
ports, but maxes out at 80Gbps so with a 1:1 subscription, you're limited
to 8 10G ports. You can run out of those very quickly particularly if it's
a peering router and you opt for direct PNI's as time goes on and scale
increases. Adding a second MX104 doesn't help much because once you make
all of the needed redundant interconnects, you're still very limited on

So the next bump up (which is an investment no doubt) is the larger MX
series. The MX240 has two card slots available. Using 16x10G or 32x10G will
yield a nice port density. One school of thought is since the MX480 bare
chassis is not much more than that of the MX240, it makes more ROI sense
just to opt for the larger chassis. YMMV

On Mon, Jun 6, 2016 at 1:01 AM, Ralph E. Whitmore, III <
ralphw at interworld.net> wrote:

> I am in the process of replacing my old cisco650x hardware and was steered
> to this list to pose the following questions:
> I have 4 primary BGP transits  each delivering 600k+ routes to me and we
> will be adding another probably 600k+peer in the near future.  The sales
> rep recommended the MX 104 to us first, but then came back to us and said
> "Sorry this router isn't adequate for your needs you need to be in the
> MX240 Chassis" I read the spec's I can find and it says from a routing
> engine perspective (RE-S-MX104)  that it will handle the routes with room
> to grow on."
> From Juniper:
> IPv4 unicast FIB 1 million
> IPv6 unicast FIB  512K
> Ipv4 RIB   4 million
> IPv6 RIB  3 million
> So the question is:  is there some other limiting factor(s)  that should
> steer me away from the MX104 to the MX240 Chassis? Is the sales rep blowing
> smoke?  I am hoping to find someone here who has tried this config and will
> either say yes this is great solution or  OMG, I'd never try that again.
> Thanks
> Ralph
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Bill Blackford

Logged into reality and abusing my sudo privileges.....

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