Upstream connection is crucial to connect the OLT and the ONTs to the aggregation and core layers of the carrier/ISP network. If the OLT has no uplink connection to the upper layer devices, there will be no service available for ONTs.
User device information
Equipment: Huawei MA5608T
Firmware Version: R015C00
Board: H801MCUD01
ISSUE DESCRIPTION
The customer reported that the OLT upstream port did not link with Huawei S6730 Switch interface at 10GE rate nor at GE. The customer topology is represented below.
Figure 1: Topology Representation
Both ends have working 10GE SFP+ and proper fiber connections as well. The SFP+ and fibers have been previously validated and are working as expected in other equipment.
ISSUE ANALYSIS
The first step is to check how to rates are configured in the uplink interfaces, the interface status can give us much information regarding what might be incorrectly configured. By running display board 0/2, we have the info:
Figure 2: display board 0/2 – before
The customer reported that the interface that he was trying to configure was the 0/2/3 interface, which has the optic status mismatch and speed set as auto.
In the documentation, we can see that the status “mismatch” is regarding SFP type and port speed.
Figure 2: display port state(ethernet) – ICS Documentation
ROOT CAUSE
The port was configured for GE communication while the SFP+ was 10GE. This created the mismatch state in “Optic Status“.
Many OLT MPUs do not support auto-neg function, especially in older firmware versions. So as a general rule, it is a good practice to keep it off.
SOLUTION DESCRIPTION
Since the customer wants to link at 10GE rate, we must change 2 parameters:
- port type: change port type from GE to 10GE.
- auto negotioation: off, for exclusive 10GE rate.
The commands below do the operations described above.
MA5608T(config-if-mcu-0/2)#auto-neg 3 disable
MA5608T(config-if-mcu-0/2)#speed 3 10000After that, we check the board status again.
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