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

3.25 Communication failures in filters and QoS configurations

3.25.1 Checking the filters and QoS 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 filters and QoS control, do the following.
Note that even if the policy-based routing or policy-based switching specified for filtering follows
default operations, their default discarding of packets is treated the same way as the discarding of
packets by filters. Along with the procedure below, see 3.28.1 Actions to take when packets are
not forwarded in policy-based routing and 3.29.1 Actions to be taken when packets are not
forwarded in policy-based switching.
(1) Checking whether packets have been discarded by filtering
1. Log in to the Switch.
2. Execute the
applied to the interface, the number of packets that match the filter conditions, and the number
of packets discarded by a filter entry for implicit discard.
3. Compare the filter conditions you checked in step 2 and the contents of the packets that cannot
be forwarded to determine whether the target packets were discarded, or whether you have
executed policy-based routing or policy-based switching. If the contents of the packets that
cannot be forwarded do not match any of the applied filter 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
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
matched packets(max-rate over)
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. Log in to the Switch.
2. Execute the
command, and check the filter conditions in the access list
show access-filter
command, and check the flow detection conditions and operation
show qos-flow
show qos queueing
3. Troubleshooting Functional Failures During Operation
statistics item is incremented. If the count of this
command with the
interface
parameter, and check the
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