Dell POWERCONNECT 6200 SERIES Configuration Manual page 169

NOTE:
The switch cannot guarantee that a backup unit has exactly the same data that the management unit has
when it fails. For example, the management unit might fail before the checkpoint service gets data to the backup if
an event occurs shortly before a failover.
Table 9-3 lists the applications on the switch that checkpoint data and describes the type of data that is
checkpointed.
Table 9-3. Applications that Checkpoint Data
Application
ARP
Auto VOIP
Captive Portal
DHCP server
DHCP snooping
DOT1Q
DOT1S
DOT1X
DOT3ad
IGMP/MLD Snooping
IPv6 NDP
iSCSI
LLDP
OSPFv2
OSPFv3
Route Table Manager
SIM
Voice VLAN
Checkpointed Data
Dynamic ARP entries
Calls in progress
Authenticated clients
Address bindings (persistent)
DHCP bindings database
Internal VLAN assignments
Spanning tree port roles, port states, root bridge, etc.
Authenticated clients
Port states
Multicast groups, list of router ports, last query data for each VLAN
Neighbor cache entries
Connections
List of interfaces with MED devices attached
Neighbors and designated routers
Neighbors and designated routers
IPv4 and IPv6 dynamic routes
The system's MAC addresses. System up time. IP address, network mask,
default gateway on each management interface, DHCPv6 acquired IPv6
address.
VoIP phones identified by CDP or DHCP (not LLDP)
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Utility