Cisco Redundant Power System (RPS2300) si

[AbbyDoc-UK]

HI,

I am looking at using the Cisco Redundant Power System 2300 as redundant PS for some MS 255 switches but not sure which of the two configuration models (C3K-PWR-1150WAC or C3K-PWR-750WAC) to use and how many switches each will support?

Rack one (Separate Floor)

6 x Cisco Meraki MS225-48-HW

2 x Cisco Meraki MS225-24-HW

2 x Cisco Meraki MS225-24P-HW

Rack Two (Separate Floor)

4 x Cisco Meraki MS225-48-HW

1 x Cisco Meraki MS225-24P-HW

Regards,

Abby

[Ryan_Miles]

You would need to note the max power load per the MS225 data sheet

Then, check the max output power of the RPS2300 in both configurations and do the math. It appears you'd want the 1150 W if supporting two 24 port switches or a 48 port full power switch.

[PhilipDAth]

The RPS systems are not that great.  They have all sorts of gotchas.  I won't sell them to my customers.

For customers that want greater redundancy - stick to switches that can take redundant power supplies, and you won't be disappointed.

[cmr · Accepted solution]

We use them with MS225s and MS210s.  When using the 48 port LP switches or the 24 port P switches the 715W power supplies are fine.  The RPS takes two PSUs and although you can connect up to 6 switches to it, each power supply can only support one switch at once. 

[AbbyDoc-UK]

@cmr  based on the below power load and the fact that the RPS can support up to 6 devices at once providing redundancy for up to two at a time depending on configuration I am thinking.

1st Floor

2 x RPS C3K-PWR-750WAC each with one 750 PS

6 x Cisco Meraki MS225-48-HW

2 x Cisco Meraki MS225-24-HW

1 x RPS C3K-PWR-750WAC each with two 750 PS

2 x Cisco Meraki MS225-24P-HW

2nd Floor

2 x RPS C3K-PWR-750WAC each with two 750 PS

4 x Cisco Meraki MS225-48-HW

1 x Cisco Meraki MS225-24P-HW

We will have additional redundancy such has further connecting the RPSs to UPS and independent AC sources.

[cmr]

Looks okay, but I would spread the 1st floor ones out differently as you have a 4:1 ratio for the non-PoE switches but a 1:1 ratio for the PoE ones, unless the PoE switches are much more important?

[AbbyDoc-UK]

@cmr thanks for the suggestion. How does the below look?

1st Floor

1 x RPS C3K-PWR-750WAC each with one 750 PS

4 x Cisco Meraki MS225-48-HW

1 x RPS C3K-PWR-750WAC each with one 750 PS

2 x Cisco Meraki MS225-48-HW

2 x Cisco Meraki MS225-24-HW

1 x RPS C3K-PWR-750WAC each with two 750 PS

2 x Cisco Meraki MS225-24P-HW

2nd Floor

2 x RPS C3K-PWR-750WAC each with two 750 PS

4 x Cisco Meraki MS225-48-HW

1 x Cisco Meraki MS225-24P-HW

[cmr]

I would change the 1st floor as below (but it does depend on what is connected to each switch)

1 x RPS with two C3K-PWR-750WAC 

3 x Cisco Meraki MS225-48-HW

1 x Cisco Meraki MS225-24-HW

1 x Cisco Meraki MS225-24P-HW

1 x RPS with two C3K-PWR-750WAC 

3 x Cisco Meraki MS225-48-HW

1 x Cisco Meraki MS225-24-HW

1 x Cisco Meraki MS225-24P-HW

[AbbyDoc-UK]

@cmr yes that will work too thanks. Do you mean the importance of what device is connected to each switch?

[AbbyDoc-UK]

@cmr Thank you for the contribution. 😊

[MK2]

I just use an ATS like this: https://www.apc.com/us/en/product/AP4421A/apc-netshelter-rack-automatic-transfer-switch-1u-10a-230v-...