NEC IP8800/S2400 Series, Troubleshooting Manual

Page: 192 / 250

4.
Troubleshooting Communication Failures Due to Resource Shortage [IP8800/S6700] [IP8800/S6600] [IP8800/S6300]
130
4.1 MAC Address Table Resource Shortage
4.1.1 Checking 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
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").
4.1.2 Action 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 When MAC address table usage
reaches 80% MAC address table entries was beyond 80 percent of capacity.
2 When MAC address table usage
reaches 100% MAC address table entries exceeded capacity.
No. Trigger Log Message
1 MAC address learning
ARP/NDP learning
MAC 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 address
table. ( VLAN <ID>,mac <MAC> )*
4 Setting MAC address learning
suppression function
The "no mac-address-table learning" entry can't be registered
at MAC address table. ( VLAN <ID> )*
5 IEEE802.1X authentication
(port authentication, VLAN
authentication (static))
The 802.1X Supplicant MAC address can't be registered at
hardware tables.*
Note: This log is displayed when the
show dot1x logging
command is executed.
6 Ring Protocol enabled
Additional Ring Protocol
registration AXRP <ring id> : The MAC address entry can't be registered at
hardware tables.
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.