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Utility 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 Checkpointed Data
ARP Dynamic ARP entries
Auto VOIP Calls in progress
Captive Portal Authenticated clients
DHCP server Address bindings (persistent)
DHCP snooping DHCP bindings database
DOT1Q Internal VLAN assignments
DOT1S Spanning tree port roles, port states, root bridge, etc.
DOT1X Authenticated clients
DOT3ad Port states
IGMP/MLD Snooping Multicast groups, list of router ports, last query data for each VLAN
IPv6 NDP Neighbor cache entries
iSCSI Connections
LLDP List of interfaces with MED devices attached
OSPFv2 Neighbors and designated routers
OSPFv3 Neighbors and designated routers
Route Table Manager IPv4 and IPv6 dynamic routes
SIM The system's MAC addresses. System up time. IP address, network mask,
default gateway on each management interface, DHCPv6 acquired IPv6
address.
Voice VLAN VoIP phones identified by CDP or DHCP (not LLDP)