Cisco 6500 - Manual (Page 2)

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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
• Packet Handling, page 4-16
• System Monitoring, page 4-20
• Dual-Active Detection, page 4-22
• VSS Initialization, page 4-24
• VSS Configuration Guidelines and Restrictions, page 4-27
VSS Overview
Network operators increase network reliability by configuring redundant pairs of network devices and
links.
Figure 4-1 shows a typical switch network configuration. Redundant network elements and
redundant links can add complexity to network design and operation. Virtual switching simplifies the
network by reducing the number of network elements and hiding the complexity of managing redundant
switches and links.
A VSS combines a pair of Catalyst 6500 series switches into a single network element. The VSS
manages the redundant links, which externally act as a single port channel.
The VSS simplifies network configuration and operation by reducing the number of Layer 3 routing
neighbors and by providing a loop-free Layer 2 topology.
Figure 4-1 Typical Switch Network Design
The following sections present an overview of the VSS. These topics are covered in detail in subsequent
chapters:
• Key Concepts, page 4-3
• VSS Functionality, page 4-6
• Hardware Requirements, page 4-8
• Understanding VSL Topology, page 4-11
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Distribution
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