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)

 

 

Utility

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Dell 6200 SERIES manual 169, Applications that Checkpoint Data Checkpointed Data

6200 SERIES specifications

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