Cisco Catalyst 4500 Series Software Configuration Guide

12-5
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
Supervisor Engine Redundancy Guidelines and Restrictions
Note You cannot enter CLI commands on the standby supervisor engine console.
These sections describe supervisor engine redundancy synchronization:
• RPR Supervisor Engine Configuration Synchronization, page 12-5
• SSO Supervisor Engine Configuration Synchronization, page 12-5
RPR Supervisor Engine Configuration Synchronization
Because the standby supervisor engine is only partially initialized in RPR mode, it interacts with the
active supervisor engine only to receive configuration changes at startup and upon saving the
configuration changes.
When a standby supervisor engine is running in RPR mode, the following events trigger synchronization
of the configuration information:
• When the standby supervisor engine boots, the auto-sync command synchronizes the persistent
configuration. This command is enabled by default. For details, refer to “Synchronizing the
Supervisor Engine Configurations” section on page 12-10.
• When the active supervisor engine detects the standby supervisor engine, 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.
• When you make changes to the configuration, you must use the write command to save and
synchronize the startup configuration to the standby supervisor engine.
SSO Supervisor Engine Configuration Synchronization
When a standby supervisor engine runs in SSO mode, the following events trigger synchronization of
the configuration information:
• When the active supervisor detects the standby supervisor engine, synchronization of the persistent
and running configuration takes place, allowing the standby supervisor engine to arrive at a
fully-initiated state.
• When real-time changes occur, the active supervisor engine synchronizes the running-config and
(or) the persistent configuration (if necessary) with the standby supervisor engine.
• When you change the configuration, you must use the write command to allow the active supervisor
engine to save and synchronize the startup configuration to the standby supervisor engine.
Supervisor Engine Redundancy Guidelines and Restrictions
The following guidelines and restrictions apply to supervisor engine redundancy:
• If SSO mode cannot be established between the active and standby supervisor engines because of
an incompatibility in the configuration file, a mismatched command list (MCL) is generated at the
active supervisor engine and a reload into RPR mode is forced for the standby supervisor engine.
Subsequent attempts to establish SSO, after removing the offending configuration and rebooting the
standby supervisor engine with the exact same image, might cause the
C4K_REDUNDANCY-2-IOS_VERSION_CHECK_FAIL and

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E