Schneider Electric 840 USE 106 0 manual IP Address Assignment, Configuring, Transparency

Ethernet Hot Standby Solution

IP Address Assignment

Configuring the	The NOE can be configured to work in conjunction with the Hot Standby controller.
NOE	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.
	Note: For a Hot Standby system, the two IP Addresses will be consecutive.
	The following table shows the IP Address assignments.
	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.
IP Address
	For continued Ethernet communication, the new Primary NOE must have the same
Transparency	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: 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".

168 840 USE 106 00 January 2003