Hello everyone,
Today I will share you with how to deal with the Bosch cameras connected to S5720-SI failed to works.
Issue Description
The customer reported that the Bosch cameras connected to the S5720SI failed to work.
Version: V200R010C00SPC600
Alarm Information
By investigating on switch found that the movement is not working for those cameras drawing less than 14W power. The Cameras drawing 14W is working fine.
<QAS-LAN-SWT-1>dis poe power
Codes: REFPW(Reference power), USMPW(User set max power),
CURPW(Current power), PKPW(Peak power), AVGPW(Average power)
PortName Class REFPW(mW) USMPW(mW) CURPW(mW) PKPW(mW) AVGPW(mW)
--------------------------------------------------------------------------------
GigabitEthernet0/0/1 4 30000 30000 15105 15635 14956
GigabitEthernet0/0/2 4 30000 30000 14999 15529 14811
GigabitEthernet0/0/3 4 30000 30000 12561 14416 12473
GigabitEthernet0/0/4 4 30000 30000 12349 14893 12342
GigabitEthernet0/0/5 4 30000 30000 14999 15582 14869
Handling Process
Check the debug information as below:
<HUAWEI>t d
Info: Current terminal debugging is on.
<HUAWEI>t m
Info: Current terminal monitor is on.
<HUAWEI>debugging lldp all interface GigabitEthernet 0/0/3
<HUAWEI>d t 0
Packet sent from the camera to the switch:
Mar 28 2018 00:56:39.600.4+03:00 QAS-LAN-SWT-1 DBGCENTER/7/DEBUG:Receive Packet. (IfIndex=9)
Mar 28 2018 00:56:39.600.5+03:00 QAS-LAN-SWT-1 DBGCENTER/7/DEBUG:Process LLDP Packet Out String.(szTempStr= 01 80 C2 00 00 0E 00 07 5F 9B A3 56 88 CC 02 07 04 00 07 5F 9B A3 56 04 07 03 00 07 5F 9B A3 56 06 02 00 78 FE 09 00 12 0F 01 03 6C 00 FF FF FE 09 00 12 0F 03 00 00 00 00 00 FE 06 00 12 0F 04 05 EE FE 0C 00 12 0F 02 00 01 05 51 00 FF 00 82 FE 1A 00 12 BB 09 42 6F 73 63 68 20 53 65 63 75 72 69 74 79 20 53 79 73 74 65 6D 73 08 07 4E 6F 74 20 73 65 74 0A 07 4E 6F 74 20 73 65 74 0C 2F)
Mar 28 2018 00:56:39.600.6+03:00 QAS-LAN-SWT-1 DBGCENTER/7/DEBUG:Process LLDP Packet Out String.(szTempStr= 41 55 54 4F 44 4F 4D 45 20 49 50 20 73 74 61 72 6C 69 67 68 74 20 37 30 30 30 20 48 44 20 2D 20 49 50 20 53 75 72 76 65 69 6C 6C 61 6E 63 65 0E 04 00 80 00 80 00 00)
According to the collected LLDP debugging information, the power information in the packet sent from a camera is encapsulated in the 802.3at TLV. In the response packet sent by the switch, correct power information is also encapsulated in the 802.3at TLV. However, the response packet also contains the Extended Power-via-MDI TLV (another power negotiation mode) of TIA.
Do capture on switch as below:
In the packet sent from the camera, power information is encapsulated only in the Power Via MDI TLV.
In the response packet sent by the switch, correct power information is encapsulated in the Power Via MDI TLV. However, the packet also contains the Extended Power-via-MDI TLV of TIA, which records a power of 0.2 W. This affects the normal operation of the camera.
Root Cause
By default, in the response packet sent by the switch, correct power information is encapsulated in the Power Via MDI TLV. However, the packet also contains the Extended Power-via-MDI TLV of TIA, which records a power of 0.2 W. This affects the normal operation of the camera.
Solution
After the lldp dot3-tlv power 802.3at and undo lldp tlv-enable med-tlv power-over-ethernet commands are run on the corresponding interface, the switch uses only the Power Via MDI TLV in the LLDP packet sent to negotiate the power with the camera. This ensures that the camera works properly.
[Quidway-Ethernet0/0/3]lldp dot3-tlv power 802.3at
[Quidway-Ethernet0/0/3]undo lldp tlv-enable med-tlv power-over-ethernet
This is I want to share with you today, thank you!
