Artesyn AXP640, Installation And Use Manual

Page: 181 / 190

Shelf Management Alarm Module
AXP640 Installation and Use (6806800M24F)
181
7.5.2.5 Configuring RMCP Network Interface
To change the RCMP network address that is associated with the Active and Standby Shelf
managers from the default values, use the following
clia
command on the Active Shelf
Manager, where
xxx.xxx.xxx.xxx
indicates a sample IP address.
clia setlanconfig 1 3 xxx.xxx.xxx.xxx
This will set the floating RCMP IP address associated with the Active Shelf Manager specified by
the IP address supplied in the command. The Standby Shelf Manager floating RCMP address
will be the exclusive-OR of the least significant bit of that address. If the IP address assigned
with the
setlanconfig
is odd, the Standby Shelf Manager floating RCMP IP address will be 1
less than the active. If the RCMP IP address for the Active Shelf Manager is even, then the RCMP
IP address for the Standby Shelf Manager will be greater by 1. For information on configuration
of additional characteristics of the RMCP interface, like subnet address and so on, refer to
Pigeon Point Shelf Manager External Interface Reference .
7.5.3 Switchover Signals
A switchover takes place when the Standby SAM determines that the Active SAM is no longer
operational. The signs of this are:

The REMOTE_HEALTHY or REMOTE_PRESENT changes to FALSE. This indicates that the
peer SAM is no longer healthy or present

The TCP connection between the Active and the Standby SAMS closes. The keep alive time-
out parameter for this connection is set to 1 second to recognize a malfunction of the
Active SAM as quickly as possible. In this case the Standby SAM waits for 3 seconds and
then checks the state of the REMOTE_HEALTHY to make sure the connection is broken due
to a failure of the Active SAM and not due to a communication failure.
If the Standby SAM detects that the Active SAM is still healthy it doesn’t perform the
switchover but instead reboots itself. After the reboot it makes a second attempt to
initialize as a backup and will continue until either it succeeds in establishing the
connection with the Active SAM or it detects that the Active SAM is no longer healthy. If it
detects that it isn’t healthy it will initialize as the Active SAM.