About Supervisor Engine Redundancy - Cisco Catalyst 4500 Series Configuration Manual

About Supervisor Engine Redundancy

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About Supervisor Engine Redundancy
These sections describe supervisor engine redundancy:
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Overview
With supervisor engine redundancy enabled, if the active supervisor engine fails or if a manual
switchover is performed, the standby supervisor engine becomes the "new" active supervisor engine.
The standby supervisor engine has been automatically initialized with the startup configuration of the
active supervisor engine, shortening the switchover time (30 seconds or longer in RPR mode, depending
on the configuration; subsecond in SSO mode).
In addition to the reduced switchover time, supervisor engine redundancy supports the following:
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When power is first applied to a switch, the supervisor engine that boots first becomes the active
supervisor engine and remains active until a switchover occurs.
A switchover will occur when one or more of the following events take place:
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Table 10-1
Table 10-1
Supported Switches
WS-C4507R-E, WS-C4510R-E,
WS-C4507R+E, WS-C4510R+E
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
10-2
Chapter 10 Configuring Supervisor Engine Redundancy Using RPR and SSO on Supervisor Engine 7-E and Supervisor
Overview, page 10-2
RPR Operation, page 10-3
SSO Operation, page 10-3
Online insertion and removal (OIR) of the supervisor engine.
Supervisor engine redundancy allows OIR of the redundant supervisor engine for maintenance.
When the redundant supervisor engine is inserted, the active supervisor engine detects its presence,
and the redundant supervisor engine boots into a partially-initialized state in RPR mode and a
fully-initialized state in SSO mode.
Software upgrade. (See the
To minimize down time during software changes on the supervisor engine, load the new image on
the standby supervisor engine, and conduct a switchover.
The active supervisor engine fails (due to either hardware or software function) or is removed.
A user forces a switchover.
A user reloads the active supervisor engine.
provides information about chassis and supervisor engine support for redundancy.
Chassis and Supervisor Support
"Performing a Software Upgrade" section on page
Supported Supervisor Engines
Supervisor Engine 7-E (WS-X45-SUP7-E) and
Supervisor Engine 7L-E (WS-X45-SUP7L-E)
10-12.)
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