Power-stacking help 930

[kevtwad]

Hi,

I'm struggling to understand what input i need to support each stack when dual feed, so if I was too loose either my essential or non-essential feed there is another drawn for the stack not to shut down any devices, I thought i had it but a recent event proven otherwise, here is an example.

Power Stack                      Stack   Stack    Total   Rsvd    Alloc   Sw_Avail Num  Num

    Name                             Mode    Topolgy  Pwr(W)  Pwr(W)  Pwr(W)   Pwr(W)  SW   PS

    --------------------             ------  -------  ------  ------  ------  ------  ----- -----

    POWERSTACK1                      SP-RS   Ring     5830    1130    2238    2462      3    6

    Power Stack                      PS-A   PS-B   Power     Alloc     Poe_Avail   Consumd Pwr

SW  Name                             (W)    (W)    Budgt(W)  Power(W)    Pwr(W)    Sys/PoE(W)

--  --------------------             -----  -----  --------  --------   --------  ------------

1   POWERSTACK1                      1100   1100   1824      986        838       187/200

2   POWERSTACK1                      1100   715    1767      955        812       174/178

3   POWERSTACK1                      715    1100   1109      297        812       135/30

--  --------------------             -----  -----  --------  --------   --------  ------------

Totals:                                                      2238       2462      496/408

So both feeds can draw up to 2915w, if i was to loose 1 side (2915w) would the remaining 2915w be enough for the switch not to deny any power-inline requests.

Thanks

Kevin 

[Cisco_Virtual_Engineer]

Based on the data you provided, it appears that the total power allocated for the devices in the stack is 2238W, and you have a total available power of 2915W on each feed. If you lose one side of the feed, the remaining 2915W should be enough to support the power requirements of the devices in the stack without denying any power-inline requests.

Here's a breakdown of the power usage in your stack:

- Power Stack 1 (Switch 1): 1100W (PS-A) + 1100W (PS-B) = 2200W total
- Power Allocated: 1824W
- POE Available: 986W
- Consumed Power: 838W (187W System + 200W PoE)

- Power Stack 1 (Switch 2): 1100W (PS-A) + 715W (PS-B) = 1815W total
- Power Allocated: 1767W
- POE Available: 955W
- Consumed Power: 812W (174W System + 178W PoE)

- Power Stack 1 (Switch 3): 715W (PS-A) + 1100W (PS-B) = 1815W total
- Power Allocated: 1109W
- POE Available: 297W
- Consumed Power: 812W (135W System + 30W PoE)

Total Allocated Power for the stack: 2238W
Total Consumed Power for the stack: 2462W (496W System + 408W PoE)

With a single feed of 2915W, you should have enough power to support the devices in the stack without denying any power-inline requests. However, it is essential to monitor the power usage and plan for any potential future expansion of devices, which may require additional power.

[Stryill]

Based on the information provided, it appears that you have a power stack with three switches named POWERSTACK1. Each switch has a power budget, power allocation, available PoE (Power over Ethernet), and consumed power values associated with it.

In this case, the power stack is configured in SP-RS (Single Power, Redundant Stack) mode with a ring topology. The total power consumption of the stack is 5830W, with 1130W reserved and 2238W allocated. The switch also has 2462W of power available in the stack.

Looking at the individual power allocations for each switch in the power stack, here are the details:

1. Switch 1 (SW1) has a power budget of 1100W and is allocated 986W. The available PoE power is 838W, with a total power consumption of 187W (Sys: 187W, PoE: 0W).

2. Switch 2 (SW2) has a power budget of 1100W and is allocated 955W. The available PoE power is 812W, with a total power consumption of 174W (Sys: 174W, PoE: 0W).

3. Switch 3 (SW3) has a power budget of 715W and is allocated 297W. The available PoE power is 812W, with a total power consumption of 135W (Sys: 30W, PoE: 105W).

The total power allocated by all switches in the power stack is 2238W, while the total power available in the stack is 2462W.

Now, let's address your concern about losing one side of the power feed. If you were to lose one side, which has a capacity of 2915W, the remaining side would need to provide enough power to prevent the switch from denying any power-inline requests.

Since the total allocated power is 2238W, which is lower than the remaining 2915W, the remaining side should be able to handle the power demands without denying any power-inline requests. However, it's important to note that the power budget and allocation for each switch may change in response to the loss of one power feed.

To accurately assess the impact of losing a power feed and determine if the remaining power capacity is sufficient, it would be advisable to consult the specific power redundancy and failover mechanisms of your equipment or seek assistance from a qualified network engineer familiar with your setup.