Did you open a case with
tech-support
I’ve seen issues where devices
did report as Class2 or 3 devices while they should be 0 or even high-power
(POE+) and that it was just slightly over the limit and some ports seemed to be
a little bit more stringent then others.
Consider indeed:
· Setting the (lower) port on interface level as ‘power
inline high-power’
· On global or stack-unit level set ‘power inline
management static’
· Remove ‘legacy’ as dynamic method
· Or set it indeed as ‘class based’ power
And else: open a case with
tech-support to fully investigate and maybe use debug commands to find exact
reason why it did go off.
The ‘work-around’ for removing
ISDP is only applicable on Cisco devices that refuse to use industry standard
methods if it thinks it is connected to a Cisco device – mainly Cisco
multi-radio AP’s. Because they do receive ISDP info they do think they should
also get POE info over CDP – but that part is ‘closed code’ and not open part
of CDP (which is thus ISDP).
You can also work around that in
another way then removing/disabling ISDP: you can tell the Cisco device it
should accept POE negotiation form a specific device (MAC address of the switch/stack
in question). This last behavior is imho clearly a Cisco problem – it
does NOT check if it is talking to a device that supports full CDP including
Cisco proprietary POE negotiation over CDP: it just sees ‘something that looks
like CDP’ and then refuses to use the industry standard unless specifically
told to do so (via command on Cisco box like: power inline negotiation injector
<attached>
which will then be replaced
by the switch MAC address in the Cisco startup-config).
Jan
Jan
From:
Malone, Jim
Sent: Thursday, April 02, 2015 3:36 PM
To: Meister, Benjamin; WW Networking Domain
Subject: RE: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
Well,
I am out of guesses
The
only other option is go to 6.2.0.5.
Nothing
specific on Release Notes.
Jim Malone
Network Sales Engineer
Dell | Networking | VA, DC
571-232-0340
From: Meister, Benjamin
Sent: Thursday, April 02, 2015 10:22 AM
To: Malone, Jim; WW Networking Domain
Subject: RE: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
6.1.2.4
~ Benjamin R. Meister
Networking & Converged Infrastructure Sales
Dell | Enterprise Solutions,
Networking
Office + 1.646.409.1330
Mobile +
1.646.489.2035
From: Malone, Jim
Sent: Thursday, April 02, 2015 10:19 AM
To: Meister, Benjamin; WW Networking Domain
Subject: RE: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
What
version of OS are you running?
|
Release 6.1.0.6 Summary
|
User Impact
|
Resolution
|
Affected Platforms
|
|
Issues powering up POE devices on certain switch port
interfaces.
|
When dot13af and legacy mode is enabled and the first
12/24 switch ports are in error status, the last 12/24 ports are stay off.
|
Fixed high port powering issue by updating the PoE
controller firmware version to 263_75.
Please wait for few minutes for PoE controller
firmware update to complete on switch boot-up.
You will see the below log messages on switch boot-up
after switch firmware upgrade.
<187> Jun 17 04:51:57 172.25.136.215-1
POE[144021428]: hpc_poe_pwrdsne.c(6733) 582
|
N2xxxP/N3xxxP
|
Jim Malone
Network Sales Engineer
Dell | Networking | VA, DC
571-232-0340
From: Meister, Benjamin
Sent: Thursday, April 02, 2015 10:06 AM
To: Malone, Jim; WW Networking Domain
Subject: RE: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
According to the Show tech:
Power..........................................
On
Total
Power.................................... 1800 Watts
Threshold
Power................................ 1620 Watts
Consumed
Power................................. 82 Watts
Usage
Threshold................................ 90%
Power Management
Mode.......................... Dynamic
Power Detection
Mode........................... dot3af+legacy
Unit Description
Status Average
Current Since
Power Power
Date/Time
(Watts)
(Watts)
---- -----------
----------- ---------- -------- -------------------
1
System OK
0.2 39.8
1
PS-1
OK
N/A
N/A 03/14/2015 06:40:57
1
PS-2 OK
N/A
N/A 03/14/2015 06:40:57
~ Benjamin R. Meister
Networking & Converged Infrastructure Sales
Dell | Enterprise Solutions,
Networking
Office + 1.646.409.1330
Mobile +
1.646.489.2035
From: Malone, Jim
Sent: Thursday, April 02, 2015 9:59 AM
To: Meister, Benjamin; WW Networking Domain
Subject: RE: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
Question:
do you have the default 750watt power supply?
Question:
is this the only powered device plugged in?
Something
to check and work with.
Power
Inline Priority – by default all ports are set the same and here is what that
means to you.
Priority
is always enabled for all ports. If all ports have equal priority in an
overload
condition, the switch will shut down the lowest numbered ports
first.
To
test this you could change the priority of a low numbered port and retest the
phone.
It
may be preferable, if not already done, to use the 1100 watt power supplies.
Hope
this helps
Jim Malone
Network Sales Engineer
Dell | Networking | VA, DC
571-232-0340
From: Meister, Benjamin
Sent: Thursday, April 02, 2015 9:23 AM
To: WW Networking Domain
Subject: N-Series Poe - Ahhhh . . .
Dell - Internal Use - Confidential
Ok folks,
N-series 3048p:
Customer has poe phones, no problems any port.
Customer plus in a Polycom CP7937G phone [15.4w] into a
lowered number port, gets ‘ethernet disconnect’ errors. But when he
switches from say port 1/0/1-14 to port 1/0/47 the phone comes up and stays up
no problem. Same configuration on all ports.
This is unique to 1 or 2 of his switches, the remaining
switches work just fine (all stand alones)
Would this be an indication of a bad ASIC? (which
would be really weird since the lower ports also have PoE phones on them)
Point of fact: we did try ‘no ISDP enable’ trick – no
luck.
~ Ben
~
Benjamin R. Meister
Networking & Converged Infrastructure Sales
Dell | Enterprise Solutions,
Networking
Office + 1.646.409.1330
Mobile +
1.646.489.2035
