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Ethernet Hot Standby Solution
170
840 USE 106 00 January 2003
Power-Up and IP
Address
Assignment
The process of powering up affects the NOE’s IP Address assignment. To clarify
what happens during a power-up, the following two sections describe the power-up
effects on IP Address assignment and Ethernet services.
An NOE obtains its IP Address assignment at power-up as follows:
If two NOEs power-up simultaneously, a "resolution algorithm" determines the
Primary NOE, and after determining the Primary NOE, the "resolution algorithm"
assigns the configured IP Address to the Primary NOE and then assigns the
configured IP Address + 1 to the Secondary NOE.
Offline Mode at Power-up Sequence table:
The NOE performs a "duplicate IP" test by issuing an ARP request to the configured
IP Address. If a response is received within 3 seconds, the IP Address remains at
the Default IP and blinks a diagnostic code.
If no IP configuration exists, the NOE remains in standalone mode, and the IP
Address must be obtained from either a BOOTP server or from a MAC address.
If the HSBY state is ... Then the IP Address assigned is ...
Unassigned Configured IP Address
Primary Configured IP Address
Secondary Configured IP Address + 1
Unassigned to Offline See the
Offline Mode at Power-up Sequence
table following
Offline Mode at Power-up Sequence Result
Controller A powers-up before controller B
IP Address of controller A is configured IP
Address
IP Address of controller B is the configured
IP Address + 1
Both controller A and controller B power-up
a the same time
The resolution algorithm will assign controller A
the configured IP address and will assign
controller B the configured IP address + 1.