Hitachi GR2000 Series - Manual (Page 164)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
6-10 GR2K-GA-0015
Ver. 07-02
6.7 Switching mode
6.7.1 Execution method
Perform "Mode switching using swap rm command" described below when active
BCU has to be replaced during duplex operation or when a failure occurs in active
BCU. Perform "Mode switching using RM CHANGE SWITCH" however when a
command cannot be executed due to the failure in BCU. In this case, a command
may not be executable from new active mode for 30 seconds (maximum).
1. Mode switching using swap rm command
Mode is switched when a swap rm command is executed from the active terminal.
In this case, new standby mode is not restarted.
2. Mode switching using RM CHANGE SWITCH
Mode is switched when RM CHANGE SWITCH on the active RM-I/O board is
pressed during normal duplex operation. In this case, new standby mode (in
which RM CHANGE SWITCH was pressed) is restarted. Mode is not switched
even if RM CHANAGE SWITCH in the standby mode is pressed.
Mode switching may be suppressed when mode cannot be switched by the method
described above. See Subsection 6.7.2, “Main cause of suppression of mode
switching” for more details.
6.7.2 Main cause of suppression of mode switching
Mode switching is suppressed even during duplex operation when the router is in the
states below.
Inconsistency of software version
The state entered when software is upgraded in only one mode. Make the
software versions coincide with each other.
Inconsistency of operational configuration definition information
The state entered when the contents of operational configuration definition
information set in the active mode are not reflected in the standby mode. See
Subsection 4.5.2, “Precautions during duplex operation” and GR2000
Configuration Settings to make the operational configuration definition
information coincide with each other.
Pressing of EMA SUPPRESS switches
See Subsection 6.7.3, “Precautions for EMA SUPPRESS switches” for more
details.
6.7.3 Precautions for EMA SUPPRESS switches
The switches (EMA SUPPRESS switches) used to suppress mode switching are
mounted on the RM-I/O board. The EMA SUPPRESS switches are mounted on both
active and standby RM-I/O boards. EMA SUPPERSS LED lights in yellow to suppress
mode switching when either of the EMA SUPPRESS switches is pressed. Be careful
not to press the EMA SUPPRESS switch during duplex operation. Execute a set mode
or show router command to confirm from the remote site whether the EMA
SUPPRESS switch was pressed. The actual confirmation method is shown on the
next page.