Troubleshooting Ethernet Service Troubleshooting
Insufficient Quality of Traffic (Frame Drop)
Service Traffic Frames may be dropped due to various reasons. The common reasons are
listed in this section.
Note that In-band Management Traffic may affect Service Traffic, since it is given high
priority. For this reason, operations applied on indirectly connected NEs may temporarily
disrupt the service. For example, SW file transfer to NE, Log files transfer from NE,
Configuration Setup Backup and Restore files transfer, or continuous monitoring of NE by
multiple operators.
Table 94: Common Problems Related to Dropping Service Traffic Frames
Oversized Packets
Occurrence
Oversized packets are dropped by the ML
device system.
ML device MFS (this is the Maximum
Ethernet Frame size) that can be
transferred by the ML device is 1632
Bytes. In case a 4-Byte VLAN tag is
inserted by the ML device (on untagged or
stacked Ethernet port), the maximum
allowed frame size of the customer traffic
decreases to 1628 Bytes.
Reconfigure adjacent network
equipment (e.g. router) with
Maximum Ethernet Frame size of
1632 Bytes or less.
Adjacent Ethernet Port
Configuration Mismatch
ML device system and its adjacent network
equipment Ethernet port's parameters are
mismatched.
Reconfigure Ethernet ports on
either ML device or the adjacent
network equipment to match.
ML devise Ethernet Port
Configuration
Inconsistency
WFQ conflicts with Flow Control feature
enabled on a particular port.
Disable Flow Control feature to
allow WFQ to work properly.
Downstream to Customer
Site Traffic is Congested
Congestion on a ML device NE Ethernet
port occurs when the HSL BW is greater
than the Ethernet port BW (configured to
10MBps, Half or Full). Congested frames
are then dropped by L2 priority
classification.
Resolve the congestion by
configuring the Ethernet port to
100Mbps on the external
equipment (if adjacent network
equipment allows it).
Upstream from Customer
Site Traffic is Congested
on HSL
Congestion on HSL port occurs when HSL
BW is less than Ethernet port BW (usual
100MBps). Congested frames will be
dropped according with selected Port
priority classification type. The incoming
frame in ML device can be classified by
L2 or by L3 priority bits of customer
traffic.
Apply L2 or L3 priority
classification on Customer LAN
Adjacent Actelis system port to
drop packets with selective
precedence.
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