Netgear XCM8810 Chassis User Manual - Page 854
Inserting Powered Devices in the PoE Module, Modifying the Hardware Table Hash Algorithm
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NETGEAR 8800 User Manual For more information, see the hardware documentation listed in Related Publications on page 24. Inserting Powered Devices in the PoE Module To reduce the chances of ports fluctuating between powered and non-powered states, newly inserted powered devices (PDs) are not powered when the actual delivered power for the module is within approximately 19 W of the configured inline power budget for that slot. However, actual aggregate power can be delivered up to the configured inline power budget for the slot (for example, when delivered power from ports increases or when the configured inline power budget for the slot is reduced). Modifying the Hardware Table Hash Algorithm With hardware forwarding, the switch stores addresses in the hardware table to quickly forward packets to their destination. The switch uses a hash algorithm to decide where to store the addresses in the hardware table. The standard, default hash algorithm works well for most systems; however, for some addresses with certain patterns, the hardware may attempt to store address information in the same section of the hardware. This can cause an overflow of the hardware table even though there is enough room to store addresses. Error Messages Displayed With XCM8800 If you experience a full hardware table that affects Layer 2, IP local host, and IP multicast forwarding, you see messages similar to the following in the log: MSM-A: IPv4 unicast entry not added. Hardware L3 Table full. Slot 4: IPv4 unicast entry not added. Hardware L3 Table full. MSM-A: IPv4 multicast entry (10.0.0.1,224.1.1.1,vlan 1) not added. Hardware Group Table full. Slot-4: IPv4 multicast entry not added. Hardware L3 Table full. Configuring the Hash Algorithm If you experience a full hardware table, you can configure a different hash algorithm to distribute the L2 and L3 addresses differently in the hardware table. You must save your configuration and reboot the switch to modify the hash algorithm used by the hardware table. Note: Modify the hardware table hash algorithm only with the guidance of NETGEAR technical personnel. 854 | Appendix C. Troubleshooting
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