H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – HA
H3C S7500E Series Ethernet Switches Chapter 2 HA Configuration
2-1
Chapter 2 HA Configuration
When configuring HA, go to these sections for information you are interested in:
z Introduction to HA
z Configuring HA
z Displaying and Maintaining HA
2.1 Introduction to HA
High Availability (HA) feature can be used to achieve a higher degree of system
availability. Devices supporting HA are normally equipped with two routing and
switching process units (RSPU for short), with one being the active main board (AMB
for short) that works under master mode and the other being the standby main board
(SMB for short) that works under slave mode. With the synchronization function SMB
can work under the same system configuration. Thus, in the event of an AMB failure,
the SMB will immediately switch over to function as an AMB (referred to as switchover
hereafter), ensuring that the device works properly and its configuration is
synchronized with that of the AMB.
Switchover occurs in the following cases:
z AMB failure
z AMB is plugged out
z SNMP
z Manual switchover
A switchover takes place in the following order in the event of an AMB failure:
1) The SMB automatically connects and controls system bus while the original AMB
disconnects from it.
2) The original SMB becomes the new AMB whereas the original AMB automatically
reboots and functions as the new SMB.
We discuss switchover through user command line in this chapter.
2.2 Configuring HA
To do… Use the command… Remarks
Enter system view
system-view
—
Ignore version check of
the AMB and SMB
ha
slave-ignore-version-ch
eck
Optional
Version check is enabled
by default.