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PoE usage on a switch?

Hi there. I have a really basic question, so please be gentle. We have hundreds of 3750G switches deployed on our campus. Is there an easy way to determine ACTUAL PoE usage? We know that the switch supports 370w, which is ~26 phones (currently using 7945 and 7965 IP Phones) but we would like to see the actual usage -- there must be a parameter for that at the command line, right? We are responsible for the installation and deployment of telephones and we have run into some issues with the latest phone kicking one off if it is at the ragged edge of the power delivery. I have been waiting for a response from our networking team on this and thought I would ask here.

Thanks,

Blake

3 REPLIES
Hall of Fame Super Blue

Re: PoE usage on a switch?

blake.gentner wrote:

Hi there. I have a really basic question, so please be gentle. We have hundreds of 3750G switches deployed on our campus. Is there an easy way to determine ACTUAL PoE usage? We know that the switch supports 370w, which is ~26 phones (currently using 7945 and 7965 IP Phones) but we would like to see the actual usage -- there must be a parameter for that at the command line, right? We are responsible for the installation and deployment of telephones and we have run into some issues with the latest phone kicking one off if it is at the ragged edge of the power delivery. I have been waiting for a response from our networking team on this and thought I would ask here.

Thanks,

Blake

Blake

Try "sh power inline consumption" -

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/command/reference/cli2.html#wp9457661

Jon

Re: PoE usage on a switch?

Use this command

show power inline

4506-E_04#show power inline
Available:1400(w)  Used:1392(w)  Remaining:8(w)

Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                   
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi2/1     auto   on         7.1        6.3        IP Phone 7960       n/a 
Gi2/2     auto   on         14.5       12.9       IP Phone 7961       3   
Gi2/3     auto   off        0.0        0.0        n/a                 n/a 
Gi2/4     auto   off        0.0        0.0        n/a                 n/a 
Gi2/5     auto   off        0.0        0.0        n/a                 n/a 
Gi2/6     auto   off        0.0        0.0        n/a                 n/a 
Gi2/7     auto   off        0.0        0.0        IP Phone 7965       n/a 
Gi2/8     auto   off        0.0        0.0        n/a                 n/a 
Gi2/9     auto   off        0.0        0.0        n/a                 n/a 
Gi2/10    auto   on         13.5       12.0       IP Phone 7965       3   
Gi2/11    auto   on         13.5       12.0       IP Phone 7965       3   
Gi2/12    auto   on         13.5       12.0       IP Phone 7965       3   
Gi2/13    auto   on         13.5       12.0       IP Phone 7965       3   
Gi2/14    auto   off        0.0        0.0        IP Phone 7965       n/a

Mike

Community Member

Re: PoE usage on a switch?

Thank you so much -- that command provides exactly the information we have been looking for. Now we just have to use it!

Blake

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