User manual

Hot Standby
320
33002479 06 07/2008
Going to Offline When either the CPU stops or the Hot Standby state goes to offline mode, 2 events
occur:
1. NOE mode goes to offline
2. NOE uses the IP address of the present configuration
IP Address Assignment and Going Offline
Address Swap Times
Description The following table details address swap times, such as the time to close
connections, time to swap IP addresses, or time to establish connections.
HSBY State IP Address Assigned Is ...
Primary CPU to
offline
Configured IP address, if other controller does not go to primary CPU
Standby CPU to
offline
Configured IP address + 1
Service Typical Swap Time Maximum Swap Time
Swap IP addresses 6 ms 500 ms
I/O Scanning 1 initial cycle of I/O scanning 500 ms + 1 initial cycle of I/O
scanning
Global data For swap times, please see
the Quantum NOE 771xx
Ethernet Modules User Guide
(840 USE 116).
500 ms + 1 CPU scan
Client messaging 1 CPU scan 500 ms + 1 CPU scan
Server messaging 1 CPU scan + the time of the
client re-establishment
connection
500 ms + the time of the client re-
establishment connection
FTP/TFTP server The time of the client re-
establishment connection
500 ms + the time of the client
reestablishment connection
SNMP 1 CPU scan 500 ms + 1 CPU scan
HTTP server The time of the client re-
establishment connection
500 ms + the time of the client re-
establishment connection