Netgear XCM8806 Chassis User Manual - Page 72

NETGEAR 8800 User Manual Table 12. Protocol Support for Hitless Failover (Continued) Protocol Behavior Hitless Dynamic Host Configuration Protocol client The IP addresses learned on all DHCP enabled VLANs are retained on the Yes backup node after failover. Bootstrap Protocol Relay All bootprelay statistics (including option 82 statistics) are available on the Yes backup node also Simple Network Time Protocol Client SNTP client will keep the backup node updated about the last server from Yes which a valid update was received, the time at which the last update was received, whether the SNTP time is currently good or not and all other statistics. Hitless Failover Caveats This section describes the caveats for hitless failover. Check the latest version of the XCM8800 release notes for additional information. Caveat for NETGEAR 8800 Series Switches The following summary describes the hitless failover caveat for NETGEAR 8800 series switches: • I/O modules not yet in the Operational state are powered off and the card state machine is restarted to bring them to the Operational state. This results in a delay in the I/O module becoming Operational. Understanding Power Supply Management This section describes how XCM8800 manages power consumption on the switch: • Using Power Supplies on page 72 • Displaying Power Supply Information on page 76 Using Power Supplies XCM8800 monitors and manages power consumption on the switch by periodically checking the power supply units (PSUs) and testing them for failures. To determine the health of the PSU, the XCM8800 checks the voltage, current, and temperature of the PSU. The power management capability of the XCM8800: • Protects the system from overload conditions • Monitors all installed PSUs, even installed PSUs that are disabled • Enables and disables PSUs as required • Powers up or down I/O modules based on available power and required power resources 72 | Chapter 3. Managing the Switch