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Comcast Cellular Failover and MX

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Comcast Cellular Failover and MX

Hi Everyone

 

We are opening a retail/restaurant space in Portland and I'm curious about everyone's thoughts on how to setup an MX67 with Comcast's Business cellular fail-over (Connection Pro) Essentially, they have a Cradlepoint added to the mix that provides the cellular fail-over.  In our other locations we have done this with dual wired ISP's and this is the first one that we will be using cellular for backup.  I could leave it "as is" and let Comcast handle the fail-over as designed.  Although it makes me wonder if there is a better way to set this up.  As I see it, here are my options.  Please chime in if you have an opinion

 

  1. Don't mess with it, just plug in the Comcast WAN link to your MX67 and let them handle the fail-over as designed.
  2. Plug the CradlePoint into the 2nd WAN link and let the MX handle the failover
  3. Purchase a MX67C and remove the sim card from the CradlePoint and insert it into the MX67C
  4. Get rid of the Comcast cellular and purchase it from another provider, then set it up like #2 or #3

 

Thanks everyone!

 

-John

12 REPLIES 12
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Re: Comcast Cellular Failover and MX

I just realized this got posted in the wrong forum. Can we get this moved. Thanks!
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Re: Comcast Cellular Failover and MX


@JohnT wrote:
I just realized this got posted in the wrong forum. Can we get this moved. Thanks!

@CarolineS  or @MeredithW can move it to the MX forums 😃

Nolan Herring | nolanwifi.com
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Re: Comcast Cellular Failover and MX


@JohnT wrote:
I just realized this got posted in the wrong forum. Can we get this moved. Thanks!

Done!

Caroline S | Community Manager, Cisco Meraki | @merakicaroline
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Kind of a big deal

Re: Comcast Cellular Failover and MX


@JohnT wrote:

 

  1. Don't mess with it, just plug in the Comcast WAN link to your MX67 and let them handle the fail-over as designed.
  2. Plug the CradlePoint into the 2nd WAN link and let the MX handle the failover
  3. Purchase a MX67C and remove the sim card from the CradlePoint and insert it into the MX67C
  4. Get rid of the Comcast cellular and purchase it from another provider, then set it up like #2 or #3

1 - If you leave it as is, does the cellular auto kick in on their end so its transparant to you? WAN 1 will still be up on your side?

 

2 - Looks like maybe you have the option to connect the cradle point, does this action break the fail-over process on the comcast side? It could give you benefit of allowing more SD-WAN benefits, but if its strictly fail over only, not sure its worth the bother if option 1 is true

 

3 - This is doable but I'm not sure if your going to gain much except added cost. Plus Cradle Points are (correct me if i am wrong) 'more technically capable' as far as cellular performance goes?

 

4 - This is a cost question to me, so the answer lays inside the dollars

Nolan Herring | nolanwifi.com
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Re: Comcast Cellular Failover and MX

I'm in a different state, and I may be able to get down there towards the end of October to fully test how this all works.  I was hoping to be prepared to test some scenarios when I get down there.

 

1. Yes, I believe this is how it is supposed to function.  If the cable network goes down, the cellular takes over automatically.

2. Yes, if I connect the Cradlepoint directly to the MX it will effectively dismantle the Comcast setup.  However, I don't know if they have anything upstream that would prevent this from working.

3. This was my thought as well, but I didn't know if there was some added benefit to doing this.

4. True.  Although maybe someone has had a bad experience with the Comcast fail-over and would recommend against using it.

Kind of a big deal

Re: Comcast Cellular Failover and MX

At this point I think most of your questions would be better answered if you do onsite testing, and see how the fail-over works / doesn't work.

I'd be curious to see how long the fail-over takes with the Comcast solution, because if its noticeable (minutes) then you might want to go out of your way to move the fail-over onto the MX as it should be much quicker and more seamless.
Nolan Herring | nolanwifi.com
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Re: Comcast Cellular Failover and MX

Curious, how quickly does the MX usually failover to cellular?
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Re: Comcast Cellular Failover and MX

Shameless self-plug, but scroll down and you can see some testing I did with the internal cellular models.

https://nolanwifi.com/2018/10/25/you-down-with-l-t-e-yeah-you-know-me-raki/
Nolan Herring | nolanwifi.com
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Re: Comcast Cellular Failover and MX

If your using Ethernet (WAN1 and WAN2) then see here:

 

 
Note: If the MX is using the non-preferred uplink as the primary and the preferred uplink comes back online, the MX will wait about 15 seconds before switching the primary uplink to the preferred one. This is to prevent the primary connection from flapping in the event of intermittent failure or an unreliable link. 
Nolan Herring | nolanwifi.com
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Re: Comcast Cellular Failover and MX

Great blog post, thank you @NolanHerring 

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Re: Comcast Cellular Failover and MX

I'm not going to answer your question.  I'm just going to give you further info to think about.

 

When you have an active circuit plugged into WAN2 it will generate about 100MB of traffic if it only ever runs in standby mode.

For some clients with small data plans this can be an issue.  Many people don't factor in this cellular usage.

 

When you have an Internet circuit plugged into WAN1 and WAN2 you can enable SD-WAN fully and create traffic classes.  For example if you have a light weight but critical traffic (such as POS) that needs to go back to a DC, you can use SD-WAN, define a latency and loss critiera, and then fail over just that traffic if the primary WAN1 degrades but does not actually fail.

 

If you plug in a USB cellular modem (or use an MX67C with a SIM card) the cellular connection is kept offline until the primary ISP circuits fail.  So it does not use any traffic.  You can't use these backup circuits for SD-WAN (except strictly in the sense of failover).  You do get a second set of cellular firewall rules so you can easily say things like block access to guest WiFi when operating on cellular data.

 

Then there are the management aspects.  Do you want someone else to manage the failover, or would you like to have visibility and control of it?  Both answers are correct.

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Re: Comcast Cellular Failover and MX

@PhilipDAth All good points you make there.  I think the next step is to head down to the remote location and just start unplugging and testing how this fail-over actually works.  It sounds like ideally I would let the MX handle fail-over, but I'm unclear if that is an option.  As soon as I do some testing I'll report back to the forum with my findings.

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