Cisco Systems WSC4507RE96V Manual De Usuario
6-3
Software Configuration Guide—Release 12.2(20)EW
78-16453-01 A1
Chapter 6 Configuring Supervisor Engine Redundancy on the Catalyst 4507R and 4510R Switches
Supervisor Engine Redundancy Guidelines and Restrictions
Operation
With supervisor engine redundancy enabled, the standby supervisor engine automatically takes over for
the primary supervisor engine if the active supervisor engine fails or if a manual switchover occurs. The
standby supervisor engine has already been automatically initialized and configured, shortening the
switchover time. Supervisor engine redundancy provides these additional benefits:
the primary supervisor engine if the active supervisor engine fails or if a manual switchover occurs. The
standby supervisor engine has already been automatically initialized and configured, shortening the
switchover time. Supervisor engine redundancy provides these additional benefits:
•
Online insertion and removal (OIR) of the standby supervisor engine
Supervisor engine redundancy allows OIR of the standby supervisor engine for maintenance. When
the standby supervisor engine is inserted, the active supervisor engine detects its presence and
begins to transition the standby supervisor engine to the fully initialized state.
the standby supervisor engine is inserted, the active supervisor engine detects its presence and
begins to transition the standby supervisor engine to the fully initialized state.
•
Software upgrade
To minimize software upgrade and downgrade times, you can preload the standby supervisor engine
with the software version you want to upgrade or downgrade to and then configure the system to
switch over to the standby supervisor engine.
with the software version you want to upgrade or downgrade to and then configure the system to
switch over to the standby supervisor engine.
Supervisor engine redundancy also supports manual user-initiated switchover. You can initiate a
switchover with the redundancy force-switchover command.
switchover with the redundancy force-switchover command.
Supervisor Engine Synchronization
Because the standby supervisor engine is not fully initialized, it interacts with the active supervisor
engine only to receive configuration changes as they occur, keeping the configuration information on
both supervisor engines identical. This synchronization of the startup configuration file is enabled by
default in RPR mode. You cannot enter CLI commands on the standby supervisor engine.
engine only to receive configuration changes as they occur, keeping the configuration information on
both supervisor engines identical. This synchronization of the startup configuration file is enabled by
default in RPR mode. You cannot enter CLI commands on the standby supervisor engine.
When a standby supervisor engine is running in RPR mode, the following operations trigger
synchronization of the configuration information:
synchronization of the configuration information:
•
When a standby supervisor engine first comes online, the configuration information is synchronized
from the active supervisor engine to the standby supervisor engine. This synchronization overwrites
any existing startup configuration file on the standby supervisor engine.
from the active supervisor engine to the standby supervisor engine. This synchronization overwrites
any existing startup configuration file on the standby supervisor engine.
•
If the auto-synch command is enabled, changes to the startup configuration on the active supervisor
engine are automatically synchronized on the standby supervisor.
engine are automatically synchronized on the standby supervisor.
Supervisor Engine Redundancy Guidelines and Restrictions
The following guidelines and restrictions apply to supervisor engine redundancy:
•
Supervisor engine redundancy does not provide supervisor engine load balancing or any other
feature requiring two active supervisor engines. Only one supervisor engine is active. Network
services are disrupted until the standby supervisor engine takes over and the switch recovers.
feature requiring two active supervisor engines. Only one supervisor engine is active. Network
services are disrupted until the standby supervisor engine takes over and the switch recovers.
•
When using RPR mode with WS-4513+ and WS-X4515 supervisor engines, only the Gig 1/1 and
Gig 2/1 Gigabit Ethernet interfaces on each supervisor engine are available. The Gig 1/2 and Gig
2/2 interfaces are not available.
Gig 2/1 Gigabit Ethernet interfaces on each supervisor engine are available. The Gig 1/2 and Gig
2/2 interfaces are not available.
Note
This restriction applies only to the WS-4513+ and WS-X4515 supervisor engines. The
WS-X4516 supervisor engines support all four Gigabit Ethernet interfaces in RPR mode.
WS-X4516 supervisor engines support all four Gigabit Ethernet interfaces in RPR mode.