152 Managing a Switch Stack
Table 9-1 lists the applications on the switch that checkpoint data and
describes the type of data that is checkpointed.
NOTE: The switch cannot guarantee that a backup unit has exactly the same data
that the stack master has when it fails. For example, the stack master might fail
before the checkpoint service gets data to the backup if an event occurs shortly
before a failover.
Table 9-1. 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)
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