Synchronizing Boot Parameters - Cisco Catalyst 2000 Configuration Handbook

Synchronizing Boot Parameters

Synchronization of the configuration register is automatic and requires no further
1.
configuration.
(Required) Synchronize the location of the boot image:
2.
(global) redundancy
(redundancy) main-cpu
(redundancy-maincpu) auto-sync bootvar
(redundancy-maincpu) end
(privileged) copy running-config startup-config
After you have redundant Supervisors operational, you can check the status with the
command show module all to verify that one Supervisor is active and the other in
standby mode.
Catalyst 6500 Series switches allow a redundant Supervisor engine to take over if the
primary Supervisor engine fails to support fault resistance. Redundant Supervisor
engines must be of the same type with the same model feature card to support
redundancy. When you install two Supervisor engines, the first one to come online
becomes the active module. The second Supervisor engine goes into standby mode.
All administrative and network management functions, such as Simple Network
Management Protocol (SNMP), command-line interface (CLI) console, Telnet,
Spanning Tree Protocol (STP), Cisco Discovery Protocol (CDP), and VLAN Trunking
Protocol (VTP) are processed on the active Supervisor engine. On the standby
Supervisor engine, the console port is inactive. Redundant Supervisor engines are
not swappable. The system continues to operate with the same configuration after it
switches over to the redundant Supervisor engine.
Note Redundancy is always enabled and cannot be disabled. Redundancy is
enabled any time the switch has two Supervisor engines installed on it and the
switch decides which specific redundancy mode to use in accordance to the type
of images it has.
Cisco IOS Software on the Catalyst 6500 supports RPR, also known as Enhanced
High System Availability (EHSA), RPR+, NSF/SSO, and single router mode with
stateful switchover (SRM/SSO). In this operational model, one Supervisor/MSFC pair
is fully operational, and the other pair is in standby mode. The show module com-
mand lists the active and standby Supervisors. There are heartbeat messages between
two pairs to ensure rapid failure detection. There is no stateful protocol redundancy
between Supervisor engines with RPR or RPR+. The SSO redundancy mode pro-
vides the stateful protocol redundancy between Supervisor engines.
Chapter 3: Supervisor Engine Configuration 45