Cisco Catalyst 4500 Series, Software Configuration Manual

Page: 525 / 2086

12-7
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 12 Configuring Supervisor Engine Redundancy Using RPR and SSO on Supervisor Engine 7-E, Supervisor
Configuring Supervisor Engine Redundancy
•
If configuration changes on a redundant switch are made through SNMP set operations, the changes
are not synchronized to the standby supervisor engine even in SSO mode. You might experience
unexpected behavior.
• After you configure the switch through SNMP in SSO mode, copy the running-config file to the
startup-config file on the active supervisor engine to trigger synchronization of the startup-config
file to the standby supervisor engine. Then, reload the standby supervisor engine so that the new
configuration is applied on the standby supervisor engine.
•
You cannot perform configuration changes during the startup (bulk) synchronization. If you attempt
to make configuration changes during this process, the following message is generated:
Config mode locked out till standby initializes
• If configuration changes occur at the same time as a supervisor engine switchover, these
configuration changes are lost.
•
If you remove a line card from a redundant switch and initiate an SSO switchover, then reinsert the
line card, and all interfaces are shutdown. The rest of the original line card configuration is
preserved.
This situation only occurs if a switch had reached SSO before you removed the line card.
Configuring Supervisor Engine Redundancy
These sections describe how to configure supervisor engine redundancy:
•
Configuring Redundancy, page 12-7
• Virtual Console for Standby Supervisor Engine, page 12-9
•
Synchronizing the Supervisor Engine Configurations, page 12-10
Configuring Redundancy
Note
IOS XE software can be booted at three different levels (Enterprise Services, IP Base, and LAN Base),
based on the licenses available on the supervisor engine.
To configure redundancy, perform this task:
This example shows how to configure the system for SSO and display the redundancy facility
information:
Command Purpose
Step 1
Switch(config)# redundancy
Enters redundancy configuration mode.
Step 2
Switch(config-red)# mode {sso | rpr}
Configures SSO or RPR. When this command is entered,
the standby supervisor engine is reloaded and begins to
work in SSO or RPR mode.
Step 3
Switch# show running-config
Verifies that SSO or RPR is configured.
Step 4
Switch#
show redundancy
[clients | counters | history | states]
Displays the redundancy information (counter, state, and
so on) for the active and standby supervisor engines.