4. Troubleshooting Communication Failures Due to Resource Shortage [IP8800/S6700] [IP8800/S6600] [IP8800/S6300]1304.1 MAC Address Table Resource Shortage4.1.1 Checking Resource Usage of MAC Address TableThis system outputs operation log messages when the MAC address table usage reaches 80% and 100% of theaccommodating condition. The operation log message output is shown in the table below.Table 4-1: Operation Log Message for Checking Resource UsageCommunication is not immediately affected when usage reaches 80%. However, if usage of MAC address tablecontinuously increases, the limit accommodating condition may be reached and resource shortage resulting in disabledMAC address learning may arise. Check the set value and accommodation value in advance so that the limit of theaccommodating condition will not be exceeded.The MAC address table usage can be checked using the show system command (for details, see the manual "OperationCommands").4.1.2 Action to Be Taken When MAC Address Table ResourceShortage OccursWhen usage of MAC address table reaches the limit of the accommodating condition, the corresponding log message isoutput at the timing listed in the table below.Table 4-2: Operation Log Message for Checking Resource Use StatusNo. Trigger Log Message1 When MAC address table usagereaches 80%MAC address table entries was beyond 80 percent of capacity.2 When MAC address table usagereaches 100%MAC address table entries exceeded capacity.No. Trigger Log Message1 MAC address learningARP/NDP learningMAC address table entries exceeded capacity.2 Static ARP/NDP registration MAC address table entries exceeded capacity.3 Static MAC address registration The static MAC address entry can't be registered at MAC addresstable. ( VLAN ,mac )*4 Setting MAC address learningsuppression functionThe "no mac-address-table learning" entry can't be registeredat MAC address table. ( VLAN )*5 IEEE802.1X authentication(port authentication, VLANauthentication (static))The 802.1X Supplicant MAC address can't be registered athardware tables.*Note: This log is displayed when the show dot1x logging command is executed.6 Ring Protocol enabledAdditional Ring ProtocolregistrationAXRP : The MAC address entry can't be registered athardware tables.7 IGMP Snooping registration IGMP snooping: The number of the IGMP snooping entry exceededthe capacity of this system.8 MLD Snooping registration MLD snooping: The number of the MLD snooping entry exceeded thecapacity of this system.
