NEC IP8800/S2400, IP8800/S6600 manual MAC Address Table Resource Shortage, Trigger Log Message

4.Troubleshooting Communication Failures Due to Resource Shortage [IP8800/S6700] [IP8800/S6600] [IP8800/S6300]

4.1MAC Address Table Resource Shortage

4.1.1Checking Resource Usage of MAC Address Table

This system outputs operation log messages when the MAC address table usage reaches 80% and 100% of the accommodating condition. The operation log message output is shown in the table below.

Table 4-1: Operation Log Message for Checking Resource Usage

No.	Trigger	Log Message
1	When MAC address table usage	MAC address table entries was beyond 80 percent of capacity.
	reaches 80%
2	When MAC address table usage	MAC address table entries exceeded capacity.
	reaches 100%

Communication is not immediately affected when usage reaches 80%. However, if usage of MAC address table continuously increases, the limit accommodating condition may be reached and resource shortage resulting in disabled MAC address learning may arise. Check the set value and accommodation value in advance so that the limit of the accommodating condition will not be exceeded.

The MAC address table usage can be checked using the show system command (for details, see the manual "Operation Commands").

4.1.2Action to Be Taken When MAC Address Table Resource Shortage Occurs

When usage of MAC address table reaches the limit of the accommodating condition, the corresponding log message is output at the timing listed in the table below.

Table 4-2: Operation Log Message for Checking Resource Use Status

No.	Trigger	Log Message
1	MAC address learning	MAC address table entries exceeded capacity.
	ARP/NDP learning
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 address
		table. ( VLAN <ID>,mac <MAC> )*
4	Setting MAC address learning	The "no mac-address-table learning" entry can't be registered
	suppression function	at MAC address table. ( VLAN <ID> )*
5	IEEE802.1X authentication	The 802.1X Supplicant MAC address can't be registered at
	(port authentication, VLAN	hardware tables.*
	authentication (static))	Note: This log is displayed when the show dot1x logging command is executed.
6	Ring Protocol enabled	AXRP <ring id> : The MAC address entry can't be registered at
	Additional Ring Protocol	hardware tables.
	registration
7	IGMP Snooping registration	IGMP snooping: The number of the IGMP snooping entry exceeded
		the capacity of this system.
8	MLD Snooping registration	MLD snooping: The number of the MLD snooping entry exceeded the
		capacity of this system.

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