Netgear XCM8810 - 8800 SERIES 10-SLOT CHASSIS SWITCH ユーザーズマニュアル

Hitless Failover Caveats

This section describes the caveats for hitless failover. Check the latest version of the 
XCM8800 release notes for additional information.

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 

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 

Dynamic Host 
Configuration Protocol 
client

The IP addresses learned on all DHCP enabled VLANs are retained on the 
backup node after failover.

Yes

Bootstrap Protocol Relay

All bootprelay statistics (including option 82 statistics) are available on the 
backup node also

Yes

Simple Network Time 
Protocol Client

SNTP client will keep the backup node updated about the last server from 
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.

Yes