Cisco Catalyst Virtual Switching System

Cisco Catalyst Virtual Switching System

BRKCRS-3035

Shawn Wargo

Technical Marketing Engineer

Agenda

Why VSS? VSS Migration and Architecture Hardware and Software Requirements VSS High Availability and Dual Active VSS Redundant Supervisors VSS Software Upgrades Best Practices and Summary

BRKCRS-3035

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Why VSS ?

Catalyst Virtual Switching System

Topology Comparisons

Traditional

HSRP or VRRP

VSS - Physical

STP or MST

LACP or PAGP

LACP or PAGP

VSL

VSS - Logical

MEC

Access Switch

Access Switch Stack

Access Switch

Access Switch Stack

Access Switch

Benefits of Virtual Switching

Access Switch Stack

Simplify Operations by Eliminating STP, FHRP and Multiple Touch-Points

Double Bandwidth & Reduce Latency with Active-Active Multi-chassis EtherChannel (MEC)

Minimizes Convergence with Sub-second S5 tateful and Graceful Recovery (SSO/NSF)

Catalyst Virtual Switching System

Simplified Campus Architecture

Standalone Challenges

Spanning Tree Loops First Hop Routing Protocols FHRP Tunings PIM DR Priority PIM Tunings

Protocol Dependent Scale

VSS

Traditional

Unicast Flooding

Asymmetric Forwarding

Network/System Redundancy Tradeoff

Protocol Dependent Recovery

CAM/ARP Tunings

OSPF LSA/SPF Tuning Control/Mgmt/Forwarding Complexities

More VSS Benefits

Network/System Redundancy Scale-independent Recovery Hardware Dependent Recovery

Increase Unicast Capacity Increase Multicast Capacity Reduced Convergence Times

Control-plane Simplicity Operational Simplicity L2-L4 Load Sharing

Flat L2 Network Topology

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