Running 2 new switches Cisco 3850 – stackwise 480. When I plug a PoE splitter into the switches it works fine.
Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16.6.1, RELEASE SOFTWARE (fc2)
The 3850s link to two new sets of 3 x 2960s stacked. When I plug the same PoE splitter into the 2960 switches it flaps on/off/on/off.
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E7, RELEASE SOFTWARE (fc3)
Have made gigabit interface 3/0/5 port static at 15400 but no luck. Gigabit interface 3/0/5 is attached to the power splitter.
The 2960x are powering various Axis cameras via PoE without problem. Plenty of PoE Budget available.
Using the debug ilpower command outputs:
CABB_SW#debug ilpower event
ILPOWER event debugging is on
CABB_SW#
Aug 24 10:34:47.027: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= DISABLE_DTE_TIMER_EV
Aug 24 10:34:48.128: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= ILP_IEEE_DET_SHORT_EV
**Aug 24 10:34:58.544: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/0/5, changed state to down
Aug 24 10:34:59.550: %LINK-3-UPDOWN: Interface GigabitEthernet3/0/5, changed state to down
Aug 24 10:35:01.550: ILP uses DC Disconnect(Gi3/0/5): state= ILP_LINK_UP_S, event= PHY_LINK_DOWN_EV**
Aug 24 10:35:03.130: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= ILP_AUTO_NEG_DELAY_TIMEOUT_EV
Aug 24 10:35:03.130: ILP disable DTE detection X seconds (Gi3/0/20)
Aug 24 10:35:08.131: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= DISABLE_DTE_TIMER_EV
Aug 24 10:35:09.211: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= ILP_IEEE_DET_SHORT_EV
**Aug 24 10:35:14.552: ILP uses DC Disconnect(Gi3/0/5): state= ILP_LINK_UP_S, event= PHY_LINK_UP_EV
Aug 24 10:35:16.544: %LINK-3-UPDOWN: Interface GigabitEthernet3/0/5, changed state to up
Aug 24 10:35:17.548: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/0/5, changed state to up**
Aug 24 10:35:24.213: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= ILP_AUTO_NEG_DELAY_TIMEOUT_EV
Aug 24 10:35:24.213: ILP disable DTE detection X seconds (Gi3/0/20)
CABB_SW#
Aug 24 10:35:29.215: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= DISABLE_DTE_TIMER_EV
Aug 24 10:35:30.452: ILP uses DC Disconnect(Gi3/0/20): state= ILP_DETECTING_S, event= ILP_IEEE_DET_SHORT_EVno debu all
All possible debugging has been turned off
CABB_SW#
Anybody any ideas as to why ok on 3850s and not 2960s? Logs suggest to me something else is causing a disconnect prior to PoE loss.
Extra info below:
CABB_SW#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 370.0 152.2 217.8
2 370.0 132.4 237.6
3 370.0 68.4 301.6
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 30.0
Gi1/0/2 auto on 4.0 Ieee PD 1 30.0
Gi1/0/3 auto on 15.4 Ieee PD 3 30.0
Gi1/0/4 auto on 7.0 Ieee PD 2 30.0
Gi1/0/5 auto on 4.0 Ieee PD 1 30.0
Gi1/0/6 auto on 7.0 Ieee PD 2 30.0
Gi1/0/7 auto on 4.0 Ieee PD 1 30.0
Gi1/0/8 auto on 4.0 Ieee PD 1 30.0
Gi1/0/9 auto on 7.0 Ieee PD 2 30.0
Gi1/0/10 auto off 0.0 n/a n/a 30.0
Gi1/0/11 auto on 7.0 Ieee PD 2 30.0
Gi1/0/12 auto on 4.0 Ieee PD 1 30.0
Gi1/0/13 auto on 4.0 Ieee PD 1 30.0
Gi1/0/14 auto on 7.0 Ieee PD 2 30.0
Gi1/0/15 auto on 7.0 Ieee PD 2 30.0
Gi1/0/16 auto on 7.0 Ieee PD 2 30.0
Gi1/0/17 auto on 7.0 Ieee PD 2 30.0
Gi1/0/18 auto on 4.0 Ieee PD 1 30.0
Gi1/0/19 auto on 4.0 Ieee PD 1 30.0
Gi1/0/20 auto on 15.4 Ieee PD 3 30.0
Gi1/0/21 auto on 15.4 Ieee PD 3 30.0
Gi1/0/22 auto on 7.0 Ieee PD 2 30.0
Gi1/0/23 auto on 4.0 Ieee PD 1 30.0
Gi1/0/24 auto on 7.0 Ieee PD 2 30.0
Gi2/0/1 auto on 7.0 Ieee PD 2 30.0
Gi2/0/2 auto on 15.4 Ieee PD 3 30.0
Gi2/0/3 auto on 15.4 Ieee PD 3 30.0
Gi2/0/4 auto on 15.4 Ieee PD 3 30.0
Gi2/0/5 auto on 7.0 Ieee PD 2 30.0
Gi2/0/6 auto on 4.0 Ieee PD 1 30.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi2/0/7 auto on 4.0 Ieee PD 1 30.0
Gi2/0/8 auto on 4.0 Ieee PD 1 30.0
Gi2/0/9 auto on 7.0 Ieee PD 2 30.0
Gi2/0/10 auto on 15.4 Ieee PD 3 30.0
Gi2/0/11 auto off 0.0 n/a n/a 30.0
Gi2/0/12 auto on 7.0 Ieee PD 2 30.0
Gi2/0/13 auto off 0.0 n/a n/a 30.0
Gi2/0/14 auto off 0.0 n/a n/a 30.0
Gi2/0/15 auto off 0.0 n/a n/a 30.0
Gi2/0/16 auto off 0.0 n/a n/a 30.0
Gi2/0/17 auto off 0.0 n/a n/a 30.0
Gi2/0/18 auto off 0.0 n/a n/a 30.0
Gi2/0/19 auto off 0.0 n/a n/a 30.0
Gi2/0/20 auto off 0.0 n/a n/a 30.0
Gi2/0/21 auto on 15.4 Ieee PD 0 30.0
Gi2/0/22 auto off 0.0 n/a n/a 30.0
Gi2/0/23 auto off 0.0 n/a n/a 30.0
Gi2/0/24 auto on 15.4 Ieee PD 0 30.0
Gi3/0/1 auto off 0.0 n/a n/a 30.0
Gi3/0/2 auto off 0.0 n/a n/a 30.0
Gi3/0/3 auto off 0.0 n/a n/a 30.0
Gi3/0/4 auto off 0.0 n/a n/a 30.0
**Gi3/0/5 auto on 15.4 Ieee PD 0 30.0**
Gi3/0/6 auto off 0.0 n/a n/a 30.0
Gi3/0/7 auto off 0.0 n/a n/a 30.0
Gi3/0/8 auto off 0.0 n/a n/a 30.0
Gi3/0/9 auto off 0.0 n/a n/a 30.0
Gi3/0/10 auto off 0.0 n/a n/a 30.0
Gi3/0/11 auto off 0.0 n/a n/a 30.0
Gi3/0/12 auto off 0.0 n/a n/a 30.0
Gi3/0/13 auto on 7.0 Ieee PD 2 30.0
Gi3/0/14 auto on 7.0 Ieee PD 2 30.0
Gi3/0/15 auto on 7.0 Ieee PD 2 30.0
Gi3/0/16 auto on 7.0 Ieee PD 2 30.0
Gi3/0/17 auto on 7.0 Ieee PD 2 30.0
Gi3/0/18 auto on 7.0 Ieee PD 2 30.0
Gi3/0/19 auto on 7.0 Ieee PD 2 30.0
Gi3/0/20 auto off 0.0 n/a n/a 30.0
Gi3/0/21 auto off 0.0 n/a n/a 30.0
Gi3/0/22 auto off 0.0 n/a n/a 30.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi3/0/23 auto off 0.0 n/a n/a 30.0
Gi3/0/24 auto on 4.0 Ieee PD 1 30.0
Best Answer
Thanks for your replies. I went down the route that another interface event was causing the issue. Put the port on 10 Mbps full duplex and all is working fine.
Perhaps becasue the PoE splitter is new to us and is to do with PoE I automatically statrted looking at PoE. In reality it appears that it was auto port negotiation that was the issue.
Thansk for your help.