Hotplugs of RPS 2300 on 2960/3560/3550?

[b.julin]

We were thinking of picking up an RPS2300 just to use if we need to walk a power cord from one of our switches for wire management or UPS replacement, and would prefer it not to reload.

However the manual states:

"

The switch connected to the RPS 2300 might restart when it changes from RPS power to its internal power. We recommend that you first divert switch traffic to an alternate switch to avoid data loss. This does not occur on the Catalyst 3750-E or Catalyst 3560-E switches.

"

How does this work in real life? Anyone have any experiences hot plugging and hot-unplugging an RPS from a live chassis? Does it work most of the time and just reload the switch once in a blue moon, or is it a common occurence?

[mlund · Accepted solution]

Hi

When you plugg this in, nothing happens. The switch is still using it internal pwr.

If the switch is using its internal pwr you can safely remove the 2300, nothing will happen.

However if you loose the power to the internal pwr, then the 2300 takes over. When power is back to internal, you have to reload the switch to have it back internal pwr.

The main advantage is, it's up to you when to do it.

If the 2300 is powering the switch and you hot-unplugg it, the switch will do a reload, so this is also best to schedule.

The 2300 is not a "real" redundant-power. It roole is to save you from switch down because of a power-outage, and also if the inernal power get damaged.

/Mikael

[glenn.newman]

On a 3750E I found this not to be the case.  I am able to switch between AC plug and RPS 2300 22-pin cable repeatedly without causing a reboot.  I did this by hot plugging the 2300 cable in and pulling the AC plug, putting the AC plug back in and pulling the 2300 cable.  No reboots.  Here is how the switch reported the power.  Notice "Sys Pwr" goes from good to bad and back again, but the system stays up.

sw206#  show env power

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
--  ------------------  ----------  ---------------  -------  -------  -----
2  C3K-PWR-265WAC      DTN1138C050  OK              Good     N/A      265/0

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
--  ------------------  ----------  ---------------  -------  -------  -----
2  C3K-PWR-265WAC      DTN1138C050  OK              Bad      N/A      265/0

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
--  ------------------  ----------  ---------------  -------  -------  -----
2  C3K-PWR-265WAC      DTN1138C050  OK              Good     N/A      265/0

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
--  ------------------  ----------  ---------------  -------  -------  -----
2  C3K-PWR-265WAC      DTN1138C050  OK              Bad      N/A      265/0

[Christopher Bankhead]

Tested this on a catalyst 2975. I was able to switch between internal power and the RPS 2300 back and forth serveral times without issue.