Troubleshooting guide

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3.16.1 sFlow packets cannot be sent to the collector ........................................................138
3.16.2 Flow samples cannot be sent to the collector .........................................................140
3.16.3 Counter samples cannot be sent to the collector ....................................................141
3.17 Communication failures in the neighboring device management functionality ................142
3.17.1 Neighboring device information cannot be obtained by the LLDP functionality ..142
3.17.2 Neighboring device information cannot be obtained by the OADP functionality .142
3.18 NTP communication failures .............................................................................................144
3.18.1 The Switch cannot be synchronized by using NTP ................................................144
3.19 Communication failures in the IEEE 802.3ah/UDLD functionality .................................145
3.19.1 Port is in inactivate status by the IEEE 802.3ah/UDLD functionality ...................145
3.20 Problems due to the redundant configuration of the BCU, CSU, or MSU .......................146
3.20.1 Active-standby switchover is not possible .............................................................146
3.21 Problems due to the redundant configuration of the BSU .................................................147
3.21.1 BSU switchover is not possible ..............................................................................147
3.22 Problems due to the redundant configuration of the NIF ..................................................149
3.22.1 The standby NIF cannot be switched to the active system ....................................149
3.22.2 The active NIF cannot be switched to the standby system ....................................149
3.23 Power saving-related problems .........................................................................................150
3.23.1 Scheduling is disabled ............................................................................................150
3.24 Packet congestion in CPU processing does not recover ....................................................151
3.25 Communication failures in filters and QoS configurations ...............................................153
3.25.1 Checking the filters and QoS configuration information .......................................153
3.26 Access list logging problems .............................................................................................155
3.26.1 Actions to be taken when access list logs are not output .......................................155
3.27 DHCP snooping problems .................................................................................................156
3.27.1 Problems related to DHCP .....................................................................................156
3.27.2 Problems related to saving the binding database ...................................................157
3.27.3 Problems related to ARP ........................................................................................158
3.27.4 Communication problems due to causes other than DHCP and ARP ....................158
3.28 Policy-based routing problems ..........................................................................................160
3.28.1 Actions to take when packets are not forwarded in policy-based routing .............160
3.28.2 Actions to be taken when the tracking functionality of policy-based routing is in an
unexpected track state ..............................................................................................162
3.29 Policy-based switching problems ......................................................................................165
3.29.1 Actions to be taken when packets are not forwarded in policy-based switching ...165
4. Troubleshooting Communication Failures Due to a Resource Shortage 167
4.1 MAC address table resource shortage .................................................................................168
4.1.1 Checking the MAC address table resource usage ....................................................168
4.1.2 Actions to be taken when a MAC address table resource shortage occurs ..............168
4.2 When a VLAN identification table resource shortage occurs .............................................171
4.2.1 Checking the VLAN identification table resource usage .........................................171
4.2.2 Actions to be taken when a VLAN identification table resource shortage occurs ...171
4.3 When a resource shortage occurs in shared memory ..........................................................173
4.3.1 Checking the resource usage of shared memory ......................................................173
4.3.2 Actions to be taken when a resource shortage occurs in shared memory ................173
5. Obtaining Failure Information 175
5.1 Collecting maintenance information ...................................................................................176
5.1.1 Maintenance information .........................................................................................176
5.1.2 Collecting failure information by using the "dump" command ...............................178
5.2 Transferring maintenance information files ........................................................................183
5.2.1 Transferring files using the "ftp" command .............................................................183
5.2.2 Transferring files using the "zmodem" command ....................................................185
5.3 Collecting information and transferring files by using the "show tech-support" command
........................................................................................................................................187