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Mikrotik Poe Cascading

Posted: Sat Feb 09, 2019 5:48 pm
by mtssolution
Hi, good afternoon, I have question about how to deploy a network with switch Poe and router Poe in cascade. For example, switch Poe, with poe out ports, the idea is connect a router mikrotik to poe port in, the next step is connect in its poe out port different devices like as telwfone ip and APs.



Is posible to connect this poe schema?


Re: Mikrotik Poe Cascading

Posted: Mon Feb 11, 2019 10:52 am
by karlisi
We have in some sites RB260GSP -> RB951Ui-2HnD -> RB951Ui-2HnD chained, somewhere 2 chains on one switch, without problems for more than 3 years. From my experience RB951 power consumption is about 130mA on boot, about 95mA when booted, so theoretically we can put such chains on all 4 outputs.

Re: Mikrotik Poe Cascading

Posted: Tue Feb 12, 2019 4:48 am
by mtssolution
Thanks for your information. The idea is to use a switch (750w) with 48 ports, for each port we need tod connect a router mikrotik, and finally for each router, a Access Point and a Telephone IP.

SWITCH 750w - 48 ports (POE OUT) - - > (Poe In) ROUTER MIKROTIK (Poe Out) - - > (Poe In) ACCESS POINT and Telphone IP

Total Devices
1 Switch 48 Ports
48 Routers Mikrotik
48 Access Points
48 Telephone IPs

What do you think about this schema?

Re: Mikrotik Poe Cascading

Posted: Tue Feb 12, 2019 8:29 am
by mkx
Calculate total power consumption of gadgets hanging off the PoE switch ... if all gadget sets (router, AP, telephone) will be identical, then power budget per gadget set will be slightly more than 15W. Is it enough?

Apart from a few select models, PoE out capable routerboards only support single PoE out interface ... in this case you'll have to daisy-chain AP and telephone as well.
I don't know if any routerboard "small" device (e.g. AP or small router) actually supports 802.3af/at as a PoE out option. AFAIK most support passive PoE which might or might not work for 3rd party PoE gadgets.

Re: Mikrotik Poe Cascading

Posted: Tue Feb 12, 2019 9:14 am
by vecernik87
That sounds like usual hotel scenario for AP+Phone for each room with extra step... Are you sure that those "48 routers" are necessary? Are they gonna work only as PoE splitters and switches or will it really have some routing task?

fiy - for example CAP ac can do poe-out (passive only!) so if your phone accepts passive POE (very unusual), you wouldn't need router. If your phones require 802.3af/at (very common), then I am afraid there is no option available anyway - as far as I know, there is only one model (RB960PGs) with 802.3af/at poe-out except large switches...
(@mkx already said same point)

I am aware my next words will be controversial but fact is that there are ongoing issues between some AP and some wifi devices. If my assumption with hotel or other public venue is correct, then I would not recommend to implement solution which has known limitations and compatibility issues. Mikrotik is great in terms of flexibility and routing, but their PoE and Wifi is not really the best nowadays.
My last sentence can sound like I am trying to harm Mikrotik, but truth is exact oposite - we all know these issues are real and if someone order 48 AP and then they start getting complains due to disconnections or speed issues, bad reputation will harm Mikrotik way way more.

Re: Mikrotik Poe Cascading

Posted: Wed Feb 13, 2019 1:05 am
by mtssolution
Hi, everyone, thanks for information.

The 48 router I think are necesary because every apartaments will be independients the others, and each router are working how ppoe client , qos, firewall and swicth, In other scenarios I have worked directly wirth switchs Poe but in this case maybe I need use routers. The idea is to use the router RB960PGS-PB.

Schema Option 1

Mikrotik Main Router --> (220v) Unifi Switch (Poe OUT) - - > (Poe In) Router RB960PGS-PB (Poe out) - - > (port 2)AP and ip TELEPHONE(port3)

Other alternative is to use VLans instead off router for each departaments, all mangement from main router with diferents switchs for appartments.

Schema Option 2

Mikrotik Main Router --> (220v) Switch 24 ports (Poe OUT) - - > (Poe In) Switch 8 ports (Poe out) - - > (port 2 vlan1) AP and ip TELEPHONE (port3 vlan1)
- - > (port 4 vlan2) AP and ip TELEPHONE (port5 vlan2)
What do you think?
Thanks you

Re: Mikrotik Poe Cascading

Posted: Wed Feb 13, 2019 9:20 am
by mkx
For the LAN topology I'd go with VLANs (one VLAN per apartment) to keep management/routing/firewalling centralized. So one (VLAN-enabled) switch per apartment would suffice. I guess VLAN routing is easier on central router than PPPoE as well ...

I'm still concerned about PoE power consumption when it comes to a few PoE powered devices off single PoE provider port. Is it possible to have local apartment switches provide PoE to other gadgets (phone, AP) instead of central switch?