Keywords: MA5616, H831CCUC, JDSU (optical module vendor), GE optical module, GE optical port cascading, cascading failure
Summary: An MA5616 equipped with the H831CCUC control board uses the JDSU-provided GE optical module with BOM number 34060286 for upstream cascading. The cascading fails and the LINK indicator on the control board is not on.
[Problem Description]
Trigger conditions
Two MA5616s (equipped with H831CCUC control boards) use the GE optical port for cascading. The GE optical module is provided by JDSU and the BOM number is 34060286.
Figure 1 JDSU-provided GE optical module
Symptom
The cascading fails and the LINK indicator on the control board is not on.
Identification method
1. Perform the following three steps to verify that the device, optical link, and optical module are functional.
a Verify that the device is functional.
The device is powered on and displays information using the serial port. The system displays the message "Press any key to get started." Use the user name and password to log in to the device. Query the board information. The system displays "normal", indicating that the device and board are functional.
MA5616(config)#display board 0
-------------------------------------------------------------------------
SlotID BoardName Status SubType0 SubType1 Online/Offline
-------------------------------------------------------------------------
0 H831CCUC Active_normal UP2A
1
2
3
4
5 H831PDIA Normal
-------------------------------------------------------------------------
MA5616(config)#display board 0/0
---------------------------------------
Board Name : H831CCUC
Board Status : Active normal
---------------------------------------
Subboard[0]: H831UP2A Status: Normal
-----------------------------------------------------------------------------
Port Port MAC Register Link Role Active
Type State State State
-----------------------------------------------------------------------------
0 GE optic normal - auto auto off active offline
-----------------------------------------------------------------------------
------------------------------------------------------------------------------
Port Port COMBO Optic MDI Speed Duplex Flow- Active Link
Type Mode Status (Mbps) Ctrl State
------------------------------------------------------------------------------
1 GE - absence - auto auto off active offline
------------------------------------------------------------------------------
Note: For a 1000 M, electrical port in the full-duplex mode, setting MDI to
any value is invalid
b Verify that the optical link is functional.
Ensure that an orange multi-mode LC/PC optical fiber is used. After the optical link starts to work, run the following command to query the transmit and receive optical power: (The range for the transmit optical power is –9.5 dBm to –2.5 dBm, and the range for the receive optical power is –17 dBm to 0.)
MA5616(config-if-eth-0/0)#display port ddm-info 1
Command:
display port ddm-info 1
Temperature(C) : 32.550000
Supply voltage(V) : 3.300000
TX bias current(mA) : 4.550000
TX power(dBm) : -5.010000
RX power(dBm) : -6.160000
c Verify that the optical module is functional.
Verify that the optical module is free of any visible damage and is not removed. Insert the optical module to the optical port and run the following commands to verify that the optical module is functional:
MA5616(config)#interface eth 0/0
MA5616(config-if-eth-0/0)#display port opticstate 1
Note: The type of optical module does not fully support the SFF-8472
standard. The queried information may be incorrect or unspecified
Optics module information
Identifier : SFP
Ext.Identifier : GBIC/SFP function is defined by serial
ID only
Connector : LC
Transceiver
Infiniband compliance codes : Invalid
SONET compliance codes : Invalid
GE compliance codes : 1000BASE-SX
Link length : short distance
Transmitter technology : shortwave laser
Transmission media : multi-mode, 62.5m
Speed : Invalid
Encoding : 8B10B
BR,Nominal : 2100 MBits/sec
Length(9um)-km : 0 km
Length(9um) : 0.0 km
Length(50um) : 500 m
Length(62.5um) : 300 m
Length(Copper) : 0 m
Vendor name : JDSU
Vendor OUI : 412
Vendor PN : PLRXPL-VI-S24-HW
Vendor rev : 1
Wavelength : 850 nm
Cc_base : 0x7f
Options : Invalid
BR,max : Unspecified
BR,min : Unspecified
Vendor SN : CC17QQ322
Date code : 12 04 18
Diagnostic Monitoring Type : Internally Calibrated
Enhanced Options : Optional Alarm/warning flags implemented
for all monitored quantities
SFF-8472 Compliance : Includes functionality described in Rev-
10.2 SFF-8472
CC_EXT : 0xec
Vendor specific :
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
2. Check whether the LINK indicator on the control board is on. If the indicator is not on, the cascading fails.
3. Query the link status of the cascaded optical port. If the system displays "offline", the cascading fails.
MA5616(config-if-eth-0/0)#display port state all
------------------------------------------------------------------------------
Port Port COMBO Optic MDI Speed Duplex Flow- Active Link
Type Mode Status (Mbps) Ctrl State
------------------------------------------------------------------------------
0 GE optic normal - auto auto off active offline
1 GE - normal - auto auto off active offline
------------------------------------------------------------------------------
Note: For a 1000 M, electrical port in the full-duplex mode, setting MDI to
any value is invalid
----End
[Root Cause]
An error occurs when the JDSU-provided GE optical module is used with the H831CCUC control board. The LOS decision mechanism of the JDSU-provided GE optical module conflicts with that of the H831CCUC control board. As a result, the handshake fails, causing a cascading failure.
[Impact and Risk]
The MA5616 equipped with the H831CCUC control board is delivered with the JDSU-provided GE optical module (BOM number: 34060286). If the GE optical module is used for cascading, the cascading fails, affecting deployment.
[Measures and Solutions]
Recovery measures
None
Preventive measure
Configure the MAC chip register in the software.
Solution
Upgrade the control board to V800R310C00SPC103 on new sites in which the cascading is used.
[Attachment]
None
[Rectification Scope and Time Requirements]
None
[Prewarning Expiration Condition]
None
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