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Phillip
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Joined: Sun Jan 07, 2018 6:56 am

RB4011 SFP+ WAN at 2.5G with Arris S33 Modem

Mon Jan 25, 2021 2:29 am

I have 1Gb cable service and want to upgrade my RB750 to a RB4011 and want to use the SFP+ port with S+RJ10 SFP connected to the Arris S33 modem 2.5Gb port. But it seems that there is conflicting information that it may not work in auto negotiation mode .

So to get it to work if the interface does not....
1) I could run a multi gig switch between them?
2) Force the rate of the interface to 2.5G?
 
Cablenut9
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Re: RB4011 SFP+ WAN at 2.5G with Arris S33 Modem

Wed Jan 27, 2021 4:50 am

1) If this is with the WAN (NOT the local addresses) IP, then you can't use a switch between them.

2) I had a similar issue with some SFP+ modules on a CRS305 switch, and the fix was to simply force the 2.5Gb mode. Also, considering that the RB4011 only has one SFP+ port, I think it would be a bad deal to use the router if you wanted >1Gb speeds to a single device because the only interface capable of it is being used.
 
Phillip
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Re: RB4011 SFP+ WAN at 2.5G with Arris S33 Modem

Sat Jan 30, 2021 10:01 pm

If you use a dumb switch, it will work in between a router and a cable modem, but it becomes added failure point and adds cost.

I have doing more hunting and it does look like it will work if I force the negotiation mode to 2.5Gb fullduplex. Since my net work is 1Gb and I am using a Hex RB750 and a RB260GS, the switching interface will be the same with the RB4011 and will just be one unit. Also, if I load balance it between the two switches, it will be faster and moving the data between the 3 interfaces then the Hex RB750 and RB260GS.

The RB4011 is nice and is more then I need, but I would like to see them come out with a updated version of the Hex with a 10Gb SFP port and 5 10Gb ports, they could call it the Hex S+.

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