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Cisco 6500 VSS power supply question

Hello everyone!

I have a question about the possible outcome or behaviour of the power managmet during a power supply failure on a 6500 VSS.

Our costumer core switches consisting of two 6509-E in a VSS.

Here is the output of Show Enviroment and Show power switch all commands from the VSS:

------------------ show environment ------------------


environmental alarms:

  no alarms

switch 1 backplane:

  operating clock count: 2

  operating VTT count: 3

  operating fan count: 1

switch 2 backplane:

  operating clock count: 2

  operating VTT count: 3

  operating fan count: 1

switch 1 fan-tray 1:

  switch 1 fan-tray 1 type: WS-C6509-E-FAN

  switch 1 fan-tray 1 mode: High-power

  switch 1 fan-tray 1 fan-fail: OK

switch 2 fan-tray 1:

  switch 2 fan-tray 1 type: WS-C6509-E-FAN

  switch 2 fan-tray 1 mode: High-power

  switch 2 fan-tray 1 fan-fail: OK

switch 1 VTT 1:

  switch 1 VTT 1 OK: OK

  switch 1 VTT 1 outlet temperature: 30C

switch 1 VTT 2:

  switch 1 VTT 2 OK: OK

  switch 1 VTT 2 outlet temperature: 28C

switch 1 VTT 3:

  switch 1 VTT 3 OK: OK

  switch 1 VTT 3 outlet temperature: 26C

switch 2 VTT 1:

  switch 2 VTT 1 OK: OK

  switch 2 VTT 1 outlet temperature: 28C

switch 2 VTT 2:

  switch 2 VTT 2 OK: OK

  switch 2 VTT 2 outlet temperature: 28C

switch 2 VTT 3:

  switch 2 VTT 3 OK: OK

  switch 2 VTT 3 outlet temperature: 37C

VTT 10:

  VTT 10: not available

VTT 11:

  VTT 11: not available

VTT 12:

  VTT 12: not available

switch 1 clock 1:

  switch 1 clock 1 OK: OK, switch 1 clock 1 clock-inuse: in-use

switch 1 clock 2:

  switch 1 clock 2 OK: OK, switch 1 clock 2 clock-inuse: not-in-use

switch 2 clock 1:

  switch 2 clock 1 OK: OK, switch 2 clock 1 clock-inuse: in-use

switch 2 clock 2:

  switch 2 clock 2 OK: OK, switch 2 clock 2 clock-inuse: not-in-use

switch 1 power-supply 1:

  switch 1 power-supply 1 fan-fail: OK

  switch 1 power-supply 1 power-input: AC low

  switch 1 power-supply 1 power-output-mode: low

  switch 1 power-supply 1 power-output-fail: OK

switch 1 power-supply 2:

  switch 1 power-supply 2 fan-fail: OK

  switch 1 power-supply 2 power-input: AC low

  switch 1 power-supply 2 power-output-mode: low

  switch 1 power-supply 2 power-output-fail: OK

switch 2 power-supply 1:

  switch 2 power-supply 1 fan-fail: OK

  switch 2 power-supply 1 power-input: AC high

  switch 2 power-supply 1 power-output-mode: high

  switch 2 power-supply 1 power-output-fail: OK

switch 2 power-supply 2:

  switch 2 power-supply 2 fan-fail: OK

  switch 2 power-supply 2 power-input: AC high

  switch 2 power-supply 2 power-output-mode: high

  switch 2 power-supply 2 power-output-fail: OK

switch 1 module 1:

  switch 1 module 1 power-output-fail: OK

  switch 1 module 1 outlet temperature: 45C

  switch 1 module 1 inlet temperature: 24C

  switch 1 module 1 device-1 temperature: 25C

  switch 1 module 1 device-2 temperature: 41C

switch 1 module 2:

  switch 1 module 2 power-output-fail: OK

  switch 1 module 2 outlet temperature: 40C

  switch 1 module 2 inlet temperature: 25C

switch 1 module 3:

  switch 1 module 3 power-output-fail: OK

  switch 1 module 3 outlet temperature: 40C

  switch 1 module 3 inlet temperature: 25C

  switch 1 module 3 device-1 temperature: 26C

  switch 1 module 3 device-2 temperature: 37C

switch 1 module 4:

  switch 1 module 4 power-output-fail: OK

  switch 1 module 4 outlet temperature: 46C

  switch 1 module 4 inlet temperature: 33C

  switch 1 module 4 asic-13 temperature: 66C

  switch 1 module 4 asic-14 temperature: 68C

  switch 1 module 4 EARL outlet temperature: 37C

  switch 1 module 4 EARL inlet temperature: 29C

  switch 1 module 4 EARL device-2 temperature: 48C

switch 1 module 5:

  switch 1 module 5 power-output-fail: OK

  switch 1 module 5 outlet temperature: 40C

  switch 1 module 5 inlet temperature: 25C

  switch 1 module 5 device-1 temperature: 33C

  switch 1 module 5 device-2 temperature: 36C

  switch 1 module 5 asic-1 temperature: 62C

  switch 1 module 5 asic-2 temperature: 42C

  switch 1 module 5 asic-4 temperature: 60C

  switch 1 module 5 asic-5 temperature: 48C

  switch 1 module 5 asic-7 temperature: 48C

  switch 1 module 5 asic-8 temperature: 65C

  switch 1 module 5 RP outlet temperature: 36C

  switch 1 module 5 RP inlet temperature: 32C

  switch 1 module 5 RP device-1 temperature: 46C

  switch 1 module 5 EARL outlet temperature: 35C

  switch 1 module 5 EARL inlet temperature: 27C

  switch 1 module 5 EARL device-1 temperature: 45C

  switch 1 module 5 EARL device-2 temperature: 46C

switch 2 module 1:

  switch 2 module 1 power-output-fail: OK

  switch 2 module 1 outlet temperature: 59C

  switch 2 module 1 inlet temperature: 29C

  switch 2 module 1 device-1 temperature: 29C

  switch 2 module 1 device-2 temperature: 53C

switch 2 module 2:

  switch 2 module 2 power-output-fail: OK

  switch 2 module 2 outlet temperature: 46C

  switch 2 module 2 inlet temperature: 27C

switch 2 module 3:

  switch 2 module 3 power-output-fail: OK

  switch 2 module 3 outlet temperature: 49C

  switch 2 module 3 inlet temperature: 28C

  switch 2 module 3 device-1 temperature: 29C

  switch 2 module 3 device-2 temperature: 44C

switch 2 module 4:

  switch 2 module 4 power-output-fail: OK

  switch 2 module 4 outlet temperature: 52C

  switch 2 module 4 inlet temperature: 35C

  switch 2 module 4 asic-13 temperature: 75C

  switch 2 module 4 asic-14 temperature: 77C

  switch 2 module 4 EARL outlet temperature: 42C

  switch 2 module 4 EARL inlet temperature: 30C

  switch 2 module 4 EARL device-2 temperature: 50C

switch 2 module 5:

  switch 2 module 5 power-output-fail: OK

  switch 2 module 5 outlet temperature: 40C

  switch 2 module 5 inlet temperature: 27C

  switch 2 module 5 device-1 temperature: 33C

  switch 2 module 5 device-2 temperature: 37C

  switch 2 module 5 asic-1 temperature: 65C

  switch 2 module 5 asic-2 temperature: 44C

  switch 2 module 5 asic-4 temperature: 61C

  switch 2 module 5 asic-5 temperature: 47C

  switch 2 module 5 asic-7 temperature: 47C

  switch 2 module 5 asic-8 temperature: 70C

  switch 2 module 5 RP outlet temperature: 36C

  switch 2 module 5 RP inlet temperature: 33C

  switch 2 module 5 RP device-1 temperature: 48C

  switch 2 module 5 EARL outlet temperature: 36C

  switch 2 module 5 EARL inlet temperature: 27C

  switch 2 module 5 EARL device-1 temperature: 47C

  switch 2 module 5 EARL device-2 temperature: 47C

  chassis connector rating: 1302.00 Watts (31.00 Amps @ 42V)

switch 2 module 1

  switch 2 module 1 connector rating: 2016.00 Watts (48.00 Amps @ 42V)

  switch 2 module 1 power consumption:  254.94 Watts ( 6.07 Amps @ 42V)

switch 2 module 2

  switch 2 module 2 connector rating: 2016.00 Watts (48.00 Amps @ 42V)

  switch 2 module 2 power consumption:  325.50 Watts ( 7.75 Amps @ 42V)

switch 2 module 3

  switch 2 module 3 connector rating: 2016.00 Watts (48.00 Amps @ 42V)

  switch 2 module 3 power consumption:  254.94 Watts ( 6.07 Amps @ 42V)

switch 2 module 4

  switch 2 module 4 connector rating: 2016.00 Watts (48.00 Amps @ 42V)

  switch 2 module 4 power consumption:  588.00 Watts (14.00 Amps @ 42V)

switch 2 module 5

  switch 2 module 5 connector rating: 1260.00 Watts (30.00 Amps @ 42V)

  switch 2 module 5 power consumption:  435.54 Watts (10.37 Amps @ 42V)

chassis per slot cooling capacity: 94 cfm

ambient temperature: < 55C

  switch 1 module 1 cooling requirement: 70 cfm

  switch 1 module 2 cooling requirement: 70 cfm

  switch 1 module 3 cooling requirement: 70 cfm

  switch 1 module 4 cooling requirement: 84 cfm

  switch 1 module 5 cooling requirement: 84 cfm

  switch 2 module 1 cooling requirement: 70 cfm

  switch 2 module 2 cooling requirement: 70 cfm

  switch 2 module 3 cooling requirement: 70 cfm

  switch 2 module 4 cooling requirement: 84 cfm

  switch 2 module 5 cooling requirement: 84 cfm

------------------ show power switch all ------------------

Switch Number: 1

system power redundancy mode = redundant

system power total =     2671.20 Watts (63.60 Amps @ 42V)

system power used =      2504.46 Watts (59.63 Amps @ 42V)

system power available =  166.74 Watts ( 3.97 Amps @ 42V)

                        Power-Capacity PS-Fan Output Oper

PS   Type               Watts   A @42V Status Status State

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

1    WS-CAC-6000W       2671.20 63.60  OK     OK     on

2    WS-CAC-6000W       2671.20 63.60  OK     OK     on

                        Pwr-Allocated  Oper

Fan  Type               Watts   A @42V State

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

1    WS-C6509-E-FAN      210.00  5.00  OK

                        Pwr-Requested  Pwr-Allocated  Admin Oper

Slot Card-Type          Watts   A @42V Watts   A @42V State State

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

1    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

2    WS-X6748-GE-TX      325.50  7.75   325.50  7.75  on    on

3    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

4    WS-X6908-10G        588.00 14.00   588.00 14.00  on    on

5    VS-SUP2T-10G        435.54 10.37   435.54 10.37  on    on

6    (Redundant Sup)       -     -      435.54 10.37  -     -

Switch Number: 2

system power redundancy mode = redundant

system power total =     2771.16 Watts (65.98 Amps @ 42V)

system power used =      2504.46 Watts (59.63 Amps @ 42V)

system power available =  266.70 Watts ( 6.35 Amps @ 42V)

                        Power-Capacity PS-Fan Output Oper

PS   Type               Watts   A @42V Status Status State

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

1    WS-CAC-3000W       2771.16 65.98  OK     OK     on

2    WS-CAC-3000W       2771.16 65.98  OK     OK     on

                        Pwr-Allocated  Oper

Fan  Type               Watts   A @42V State

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

1    WS-C6509-E-FAN      210.00  5.00  OK

                        Pwr-Requested  Pwr-Allocated  Admin Oper

Slot Card-Type          Watts   A @42V Watts   A @42V State State

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

1    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

2    WS-X6748-GE-TX      325.50  7.75   325.50  7.75  on    on

3    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

4    WS-X6908-10G        588.00 14.00   588.00 14.00  on    on

5    VS-SUP2T-10G        435.54 10.37   435.54 10.37  on    on

6    (Redundant Sup)       -     -      435.54 10.37  -     -

system auxiliary power mode = off

system auxiliary power redundancy operationally = non-redundant

system primary connector power limit =   10920.00 Watts (260.00 Amps @ 42V)

system auxiliary connector power limit = 10500.00 Watts (250.00 Amps @ 42V)

system primary power used =              2504.46 Watts (59.63 Amps @ 42V)

system auxiliary power used =            0 Watt

Our question is, what is expected to happen if for example, PS1 on SWITCH 1 (WS-CAC-6000W) fails. Is it a possible scenario that under the current configuration, that the other redundant PS2 on SWITCH1 will fail to deliver enough power to the modules on the the switch, causing a failover?

Thanks in advance,

Daniel

Everyone's tags (3)
2 REPLIES
Cisco Employee

Cisco 6500 VSS power supply question

Daniel,

I have not tested this but yes it should fail to bring most of the modules.

Redundant Mode:


When running in Redundant Mode, each power supply provides approximately 50% of its capacity to the chassis. In the event of a failure, the unaffected power supply will then provide 100% of its capacity and an alert will be generated. As there was enough to power the chassis ahead of time, there is no interruption to service in this configuration. This is also the default and recommended way to configure power supplies

HTH

Regards

Inayath

Community Member

Cisco 6500 VSS power supply question

Hello Inayath, thank you for the quick response.

So if I understand correctly, if we look at the power supply on Switch 1:

Switch Number: 1

system power redundancy mode = redundant

system power total =     2671.20 Watts (63.60 Amps @ 42V)

system power used =      2504.46 Watts (59.63 Amps @ 42V)

system power available =  166.74 Watts ( 3.97 Amps @ 42V)

                        Power-Capacity PS-Fan Output Oper

PS   Type               Watts   A @42V Status Status State

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

1    WS-CAC-6000W       2671.20 63.60  OK     OK     on

2    WS-CAC-6000W       2671.20 63.60  OK     OK     on

                        Pwr-Allocated  Oper

Fan  Type               Watts   A @42V State

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

1    WS-C6509-E-FAN      210.00  5.00  OK

                        Pwr-Requested  Pwr-Allocated  Admin Oper

Slot Card-Type          Watts   A @42V Watts   A @42V State State

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

1    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

2    WS-X6748-GE-TX      325.50  7.75   325.50  7.75  on    on

3    WS-X6748-SFP        254.94  6.07   254.94  6.07  on    on

4    WS-X6908-10G        588.00 14.00   588.00 14.00  on    on

5    VS-SUP2T-10G        435.54 10.37   435.54 10.37  on    on

6    (Redundant Sup)       -     -      435.54 10.37  -     -

Switch 1 is using 2504.46W from both 6000W supplies, and if one of the them fails, it will still use 2504.46W from on 6000W power supply. Is this correct?

Switch 2 is also consuming the same amount of power like Switch 1 due to the same modules, but using two 3000W PS's. What are the chances for failure in this case?


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