23-21
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 23 Configuring Redundancy
MSFC Redundancy
MSFC Redundancy
MSFC redundancy is described in these sections:
• Dual MSFC Redundancy, page 23-21
• Single Router Mode Redundancy, page 23-43
• Manual-Mode MSFC Redundancy, page 23-49
Note For information on configuring MSFC redundancy using Cisco nonstop forwarding (NSF) with stateful
switchover (SSO), see Chapter 24, “Configuring NSF with SSO MSFC Redundancy.”
Note Single router mode redundancy is the only supported MSFC redundancy option for Supervisor
Engine 720 and Supervisor Engine 32.
Dual MSFC Redundancy
Caution You must configure both MSFCs identically. Table 23-2 on page 23-22 summarizes the identical
requirements and the exceptions for Layer 3 redundancy for a single switch chassis.
We do not support configurations where the MSFCs are not configured identically.
These sections describe how to configure MSFC redundancy:
• Hardware and Software Requirements, page 23-21
• Layer 3 Redundancy for a Single Chassis, page 23-22
• Routing Protocol Peering, page 23-23
• Access Control List Configuration, page 23-24
• Dual MSFC Operational Model for Redundancy and Load Sharing, page 23-25
• Understanding Failure Scenarios, page 23-26
Hardware and Software Requirements
To configure Layer 3 redundancy, you must have at least one of the following configurations:
• A single chassis with two identical supervisor engine daughter card configurations:
–
Supervisor Engine 1 with Policy Feature Card (PFC) and MSFC or MSFC2 (both supervisor
engines must have the same type of MSFC)
–
Supervisor Engine 2 with PFC2 and MSFC2
• Two chassis with a supervisor engine in each—You must have at least one supervisor engine in each
chassis. Each supervisor engine must be equipped with a PFC and an MSFC.
Note Each MSFC must be running the same release of Cisco IOS software.
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