Port Multi-gig/Internet/Aggregation of RAX120

[Jollymon]

I am trying to understand why I get the following data speeds between my CM1150V to my RAX120:

• Modem to Multi-gig port on RAX120 = 940Mbps down
• Modem to Internet port on RAX120 = 940Mbps down
• Modem aggreagated to Internet/Port 1 on RAX120 = 1430Mbps down

I would think I should be able to acheive 1430Mbps down on the modem to multi-gig and use port aggregation to the M4100 switch.

[antinode]

> I am trying to understand [...]

   Did you look at the product documentation?

> o Modem to Multi-gig port on RAX120 = 940Mbps down

   What, exactly, does "Modem" mean to you?  Does "Modem" mean _one_ of
the modem's 1Gb/s Ethernet ports, not aggregating two of anything?  If
so, then why would that speed be unexpected?

> o Modem to Internet port on RAX120 = 940Mbps down

   Again, "Modem"?  Does "Modem" mean _one_ of the modem's 1Gb/s
Ethernet ports, not aggregating two of anything?  If so, then why would
that speed be unexpected?

> o Modem aggreagated to Internet/Port 1 on RAX120 = 1430Mbps down

   Does "Modem aggreagated" mean using _two_ (aggregated) 1Gb/s Ethernet
ports on the modem connected to _two_ (aggregated) 1Gb/s Ethernet ports
on the router?  If so, then why would that speed be unexpected?

> I would think I should be able to acheive 1430Mbps down on the modem
> to multi-gig [...]

   Why, exactly, did you expect to get more than 1Gb/s through a single
1Gb/s port on the modem?  Did you think that connecting it to a
"Multi-Gig" port would inspire it to new heights of performance?

      "A chain is only as strong as its weakest link."

   Or do I misinterpret your vague description of what's connected to
what?

[Jollymon]

Antinode,

While you may hold the status of "Guru" you come off very condesending.

So to answer your response:

• " Did you look at the product documentation?" Yes, the documentation in written in a way that a certain level and understanding of networking is assumed. While I think I have a foundation, I would never consider myself a Network Administrator.
• "What, exactly, does "Modem" mean to you?"  Modem refers to the device that is connect to an ISP, no dialup here. So, if the RAX120 is a Router/Wifi Access point, then it could be lead to believe a broadband Modem is in configuration. I also mention the CM1150V Cable Modem in the inital post.
• "Does "Modem" mean _one_ of the modem's 1Gb/s Ethernet ports, not aggregating two of anything?" The CM1150V has 4 ethernet ports. Two (ports 1/2) that can be configured for aggregation.
• "If so, then why would that speed be unexpected?" Being that the RAX120 router offer various way to connect to the CM1150V Modem depending the level of service being received from your ISP (e.g. <1gb/>1gb). Internet port for <1gb, multi-gig port for >1gb, and aggregation of ports 1/2 for >1gb. What is unexpected is I achieve >1400mbps on the aggregated ports, but get <960mbps on the multi-gig port. One could expect similar results for a 1.2gb service plan.
  
• " Why, exactly, did you expect to get more than 1Gb/s through a single 1Gb/s port on the modem? Did you think that connecting it to a Multi-Gig" port would inspire it to new heights of performance?" The RAX120 router supports upto 5gb on the multi-gig port and the CM1150V is a DOCSIS 3.1 device with support for up to 10gb. To you point this is possibly only achieved through link aggregation. They way it was marketed did not lead me to understand this limitiation. I was hoping to be able to to have link aggregation from the CM1150V to the RAX120 also to the M4100-26-PoE Switch and finally to my servers. Guess there is always a bottle neck.
• "Or do I misinterpret your vague description of what's connected to what?" Hopefully I have been less "vauge" and I should not assume a person with a "Guru" status would be so easily confused. My apologies for my lack if clarity.

While the sarcastic tone in my respose is intended, you should recognize people who do not have a "Guru" status come to this forum to find answers that are not obvious in the documentation or lack the knowledge of network configuration (like a typical consumer). While it is appreciate that you would take the time to respond to posts, your response and time would be better used if it was actually constructive rather than an attempt to make a new member feel stupid. 

[antinode]

> [...] Modem refers to the device that is connect to an ISP, [...]

   Ok.  So then what, exactly, does "Modem to Multi-gig port on RAX120"
mean to you?  One cable or two cables, from where, exactly, to where,
exactly?  And does one end of some cable go to a 1Gb/s port?

> [...] The CM1150V has 4 ethernet ports. Two (ports 1/2) that can be
> configured for aggregation. [...]

   How does that answer the question?  What, exactly, did you connect to
what, exactly?  "Modem to XXX" is not a complete/useful description.

> [...] the RAX120 router offer various way to connect to the CM1150V
> Modem [...]

   Which is exactly why "Modem to XXX" is not a complete/useful
description.

> [...] What is unexpected is I achieve >1400mbps on the aggregated
> ports, but get <960mbps on the multi-gig port. [...]

   Why?  "on the multi-gig port" which is connected to _what_, exactly?

> [...] They way it was marketed did not lead me to understand this
> limitiation. [...]

   Did you find any false claims, or is the real problem that you didn't
think through the capabilities and limitations of these devices, and how
you could get what you wanted from them?

>       "A chain is only as strong as its weakest link."

   Still true.

> Guess there is always a bottle neck.

   Or you could say it that way.

> [...] I was hoping [...]

   "Hoping" and "engineering" are spelled differently for a reason.

      "I was hoping that my soda-straw bridge would carry a freight
      train across the river."

> [...] Hopefully I have been less "vauge" [...]

   Not much.  The point was that "Modem to XXX" was not a useful way to
think of this stuff.  A cable has two ends.  One cable or two?  For each
cable, what, exactly, does it connect to what, exactly?

   One cable connected to a 1Gb/s port (at either end) can't do better
than 1Gb/s.  That much is not complicated.  What the "Modem" can do and
what any particular cable can do when connected to that "Modem" might be
different.

> [...] "Guru" status [...]

   The forum software assigns those labels.  Not my responsibility.