Data Path Connection State Replication
Every connection has one owner and at least one backup owner in the cluster. The backup owner does not take over the connection in the event of a failure; instead, it stores TCP/UDP state information, so that the connection can be seamlessly transferred to a new owner in case of a failure. The backup owner is usually also the director.
Some traffic requires state information above the TCP or UDP layer. See the following table for clustering support or lack of support for this kind of traffic.
|
Traffic |
State Support |
Notes |
|---|---|---|
|
Up time |
Yes |
Keeps track of the system up time. |
|
ARP Table |
Yes |
— |
|
MAC address table |
Yes |
— |
|
User Identity |
Yes |
— |
|
IPv6 Neighbor database |
Yes |
— |
|
Dynamic routing |
Yes |
— |
|
SNMP Engine ID |
No |
— |