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Ethernet Hot Standby Solution
168
840 USE 106 00 January 2003
IP Address Assignment
Configuring the
NOE
The NOE can be configured to work in conjunction with the Hot Standby controller.
Since the Primary and Secondary controllers must have an identical configuration,
the configured IP Addresses will be the same. The NOE’s IP Address is either the
configured IP Address or the configured IP Address +1. The IP Address is
determined by the current local Hot Standby state.
In the Offline state, the IP Address is determined by whether or not the other
controller is in transition to the Primary state.
The following table shows the IP Address assignments.
IP Address
Transparency
For continued Ethernet communication, the new Primary NOE must have the same
IP Address as the former Primary NOE. The IP Address in the Secondary NOE (an
NOE in the secondary state) is IP Address + 1.
The NOEs integrated in the Hot Standby configuration coordinate this swapping IP
Address with the management of Ethernet services used.
Note: For a Hot Standby system, the two IP Addresses will be consecutive.
Hot Standby State IP Address
Primary Configured IP Address
Standby Configured IP Address + 1
Transition from Primary to Offline Configured IP Address, if peer controller does not
go to Primary
Transition from Standby to Offline Configured IP Address + 1
Note: Offline - Results depend on whether or not the other controller is detected as
in transition into the primary state. If Current IP is the configured IP Address, then
change the IP Address to the configured IP Address + 1.
Note: Do not use the address IP + 1. For a Hot Standby system, do not use
consecutive addresses of the configured IP Address. If you configure the last IP
Address (255), NOE returns diagnostic code "Bad IP configuration".