Dell PowerConnect 8024 User Configuration Manual page 152

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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 lists the applications on the switch that checkpoint data and

describes the type of data that is checkpointed.

Table 9-1. Applications that Checkpoint Data

Captive Portal

DHCP snooping

IGMP/MLD Snooping

Route Table Manager

Managing a Switch Stack

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

Multicast groups, list of router ports, last query data for

Neighbor cache entries

List of interfaces with MED devices attached

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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