Communication Failures In Filtering And Qos Configurations; Checking The Filtering And Qos Control Configuration Information - Alaxala AX6700S Troubleshooting Manual

3 Troubleshooting Functional Failures During Operation

3.24 Communication failures in filtering and QoS configurations

3.24.1 Checking the filtering and QoS control configuration information

If a communication problem occurs on a network employing the Switch, it is possible that
certain packets might have been discarded either by filtering or by bandwidth monitoring,
drop control, or the QoS control shaper.
To determine which functionality discarded which packets when packets have been
discarded in the Switch by filtering and QoS control, do the following.
(1) Checking whether packets have been discarded by filtering
1. Log in to the Switch.
2. Execute the
the access list applied to the interface, the number of packets that match the filtering
conditions, and the number of packets discarded by a filter entry for implicit discard.
3. Compare the filtering conditions you checked in step 2 and the contents of the
packets that cannot be forwarded to determine whether the target packets were
discarded. If the contents of the packets that cannot be forwarded do not match any
of the applied filtering conditions, the packets might have been discarded implicitly.
4. Check whether the setting conditions in the filtering configuration are correct.
5. If the configuration has been correctly set, use access list logging to check the
information of the discarded packets.
(2) Checking whether packets have been discarded by the bandwidth monitoring of
QoS control
1. Log in to the Switch.
2. Execute the
operation settings of the bandwidth monitoring applied to the interface and also the
number of packets that match the flow detection conditions.
3. Compare the flow detection conditions you checked in step 2 and the contents of the
packets that cannot be forwarded to determine whether the target packets were
discarded. If a packet violates the maximum bandwidth control conditions, the
packet is discarded and the count of the
statistics item is incremented. If the count of this statistics item has been
incremented, packets might have been discarded by bandwidth monitoring applied
to the interface.
4. Make sure that the setting conditions for QoS control in the configuration are correct,
and that the bandwidth monitoring has been set appropriately in the system
configuration.
(3) Checking whether packets have been discarded by drop control and the QoS
control legacy shaper
For AX6700S, AX6600S, and AX6300S series switches:
1.
2.
3.
4.
168
show access-filter
show qos-flow
Log in to the Switch.
Execute the
show qos queueing
and check the
discard_pkt
output queues of the input and output interfaces used for communication.
Execute the
show qos queueing
and check the
discard_pkt
and output queues for the input or output interface used for communication.
If the counts of the statistics items checked in steps 2 and 3 are incremented,
command, and check the filtering conditions in
command, and check the flow detection conditions and
matched packets(max-rate over)
command with the
statistics item displayed for the port input and
command with the
statistics item displayed for the distribution input
parameter,
interface
parameter,
distribution