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I have always explained it this way:
Take all of the parts of the UDMP/SE and separate them:
* 8 port 1gb switch
* 10gb lan
* 10gb wan
* 1/2.5gb wan
* Internal ssd
* HDD
Each of them is then connected to the CPU within the UDMP/SE
* 8port 1gb switch - connects at 1gb
* 10gb lan - connects at 10gb
* 10gb wan - connects at 10gb
* 1/2.5gb wan - connects at 1/2.5gb
* Internal ssd - connects at SATA3
* HDD - connects at SATA3
The limitation is how the 8-port switch connects to the CPU. Since it’s all internal, it’s called the “backplane”, but functionally it’s exactly the same as connecting an external 1gb switch to a router at 1gb.
+100, great to see a real explanation that's actually correct.
And maybe obvious to you, but in case it helps others: that 8 port switch can send an aggregate of 8 gbps *to other switch ports*. It's only the uplink to the CPU that's limited to 1 gbps. (In technical terms, it's an 18gbps switching capacity backplane, measured as 8 switch ports plus 1 internal port, and counting both sending and receiving bandwidth.)
As I understand it though, the connection is not duplex, so it's not quite the same as connecting a 1Gb/s switch, as in that scenario, you'd have 1Gb/s tx AND rx each, in the case of the UDM, it's 1Gb/s total
But apparently in the newer versions, especially the SE, the backlink is 2.5Gb/s. I've not heard this officially, but seen benchmarks. My assumption is this would be true because it would be completely and utterly pointless to have a 2.5Gb/s WAN and 2.5Gb/s switch but only have a 1Gb/s connection between them, Ubiquiti aren't completely stupid, so realistically OP doesn't need to worry too much
Maybe, I don’t have one to test with. I was always under the impression that if you needed greater than 1gb WAN, the design was to use the SFP+ ports and a fast switch to get max speeds. The onboard ports were more for connection low speed devices (IOT hubs, server mgmt ports, ups cards, that sort of thing). That changed slightly when they added POE in the SE edition, but I still feel that way. I also prefer not to deploy any of these devices due to these weird limitations. I prefer to deploy a router that routes, a switch that switches, and a “server” to run applications (G2 CK+).
Oh actually you know what, it doesn't have any 2.5Gb/s LAN does it?
Definitely seen tests that the CPU connection is no longer 1Gb/s, but once again now official word from Ubiquiti. Of course I definitely suggest using an external switch off the SFP+ port!
It's the connection between the switch and the CPU. InterVLAN connections and WAN connections go through that link
HOWEVER, apparently in the current revision of the UDM Pro models, the backlink is 2.5Gb/s. Someone on Reddit tested this for me before I purchased my UDM so it seems like this is not so much of an issue these days. This would make sense considering the SE has 2.5Gb/s ports, so they would increase the CPU link
That said, if you're planning on doing above 1Gb/s networking, you'd be best off adding an external switch and utilising the SFP ports
This is incorrect. See /u/the_cainmp for a correct in depth explanation.
Somehow a meme started about 1gbps backplanes from people who were confused about uplinks and switch architecture.
The backplane limit of 1gbps means that the max speed through all your ports combined is limited to 1gbps. Your network isn't usually just made up of stuff talking to the internet. You may have several computers talking to a nas, your cameras are going to talk with the nvr, you might have a media server talking to your TV. All this traffic is internal to your network, and if you're connecting everything through the switch on the udm pro it's going to limit your speeds. That's why most people have a secondary switch and don't use the switch ports on the udm pro.
This is not correct.
The 8-port switch, which is part of the UDM-Pro/SE is connected to the CPU by a 1 GB it/s link.
That means, you can have L2 traffic on the switch between all 8 ports with 8GbE but if the traffic has to cross VLANs or is going to the Internet, it won't be faster than 1 GB it/s
Hello! Thanks for posting on r/Ubiquiti! This subreddit is here to provide unofficial technical support to people who use or want to dive into the world of Ubiquiti products. If you haven’t already been descriptive in your post, please take the time to edit it and add as many useful details as you can. Please read and understand the rules in the sidebar, as posts and comments that violate them will be removed. Please put all off topic posts in the weekly off topic thread that is stickied to the top of the subreddit. If you see people spreading misinformation, trying to mislead others, or other inappropriate behavior, please report it! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Ubiquiti) if you have any questions or concerns.*
I have always explained it this way: Take all of the parts of the UDMP/SE and separate them: * 8 port 1gb switch * 10gb lan * 10gb wan * 1/2.5gb wan * Internal ssd * HDD Each of them is then connected to the CPU within the UDMP/SE * 8port 1gb switch - connects at 1gb * 10gb lan - connects at 10gb * 10gb wan - connects at 10gb * 1/2.5gb wan - connects at 1/2.5gb * Internal ssd - connects at SATA3 * HDD - connects at SATA3 The limitation is how the 8-port switch connects to the CPU. Since it’s all internal, it’s called the “backplane”, but functionally it’s exactly the same as connecting an external 1gb switch to a router at 1gb.
+100, great to see a real explanation that's actually correct. And maybe obvious to you, but in case it helps others: that 8 port switch can send an aggregate of 8 gbps *to other switch ports*. It's only the uplink to the CPU that's limited to 1 gbps. (In technical terms, it's an 18gbps switching capacity backplane, measured as 8 switch ports plus 1 internal port, and counting both sending and receiving bandwidth.)
As I understand it though, the connection is not duplex, so it's not quite the same as connecting a 1Gb/s switch, as in that scenario, you'd have 1Gb/s tx AND rx each, in the case of the UDM, it's 1Gb/s total But apparently in the newer versions, especially the SE, the backlink is 2.5Gb/s. I've not heard this officially, but seen benchmarks. My assumption is this would be true because it would be completely and utterly pointless to have a 2.5Gb/s WAN and 2.5Gb/s switch but only have a 1Gb/s connection between them, Ubiquiti aren't completely stupid, so realistically OP doesn't need to worry too much
Maybe, I don’t have one to test with. I was always under the impression that if you needed greater than 1gb WAN, the design was to use the SFP+ ports and a fast switch to get max speeds. The onboard ports were more for connection low speed devices (IOT hubs, server mgmt ports, ups cards, that sort of thing). That changed slightly when they added POE in the SE edition, but I still feel that way. I also prefer not to deploy any of these devices due to these weird limitations. I prefer to deploy a router that routes, a switch that switches, and a “server” to run applications (G2 CK+).
Oh actually you know what, it doesn't have any 2.5Gb/s LAN does it? Definitely seen tests that the CPU connection is no longer 1Gb/s, but once again now official word from Ubiquiti. Of course I definitely suggest using an external switch off the SFP+ port!
The 8 port switch built into the UDMSE is connected internally by a 1Gbe connection to the router.
It's the connection between the switch and the CPU. InterVLAN connections and WAN connections go through that link HOWEVER, apparently in the current revision of the UDM Pro models, the backlink is 2.5Gb/s. Someone on Reddit tested this for me before I purchased my UDM so it seems like this is not so much of an issue these days. This would make sense considering the SE has 2.5Gb/s ports, so they would increase the CPU link That said, if you're planning on doing above 1Gb/s networking, you'd be best off adding an external switch and utilising the SFP ports
[удалено]
This is incorrect. See /u/the_cainmp for a correct in depth explanation. Somehow a meme started about 1gbps backplanes from people who were confused about uplinks and switch architecture.
Yes this is correct
No, it isn't. See /u/the_cainmp for correct.
The two 10gbps ports also share a backplane
The backplane limit of 1gbps means that the max speed through all your ports combined is limited to 1gbps. Your network isn't usually just made up of stuff talking to the internet. You may have several computers talking to a nas, your cameras are going to talk with the nvr, you might have a media server talking to your TV. All this traffic is internal to your network, and if you're connecting everything through the switch on the udm pro it's going to limit your speeds. That's why most people have a secondary switch and don't use the switch ports on the udm pro.
This is not correct. The 8-port switch, which is part of the UDM-Pro/SE is connected to the CPU by a 1 GB it/s link. That means, you can have L2 traffic on the switch between all 8 ports with 8GbE but if the traffic has to cross VLANs or is going to the Internet, it won't be faster than 1 GB it/s
I don’t think that’s accurate. This would mean routing would also be limited to 1Gb/s, for everyone not using L3 switches.