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Verifying Switch Virtualization (StackWise (Main Points (Joins switches…
Verifying Switch Virtualization
StackWise
Main Points
Joins switches located in the same rack into single logical unit
Uses stacking cable to create bidirectional closed-loop path
High speed backplane interface between switches
Single point of managment, configuration
Platform dependant
Has 4 versions of StackWise
Master switch is elected that maintenance configuration, pulls current IOS and configuration to the members
Up to 9 switches can be joined
4 versions of StackWise
StackWise
Supported by 3750-E/X, 3850 Series
StackWise Plus
Supported by 3750-E/X, 3850 Series
Supports "Local Switching" and Reuse - More efficiently utilizes the stack interconnect
StackWise 480
Supported by 3850 Series
Improved 480-Gbps stacking
FlexStack
StackWised-based feature
For L2 switches only
Limited to 4 stacked switches
Supported by 2960-S switches
StackWise benefits
Reduced management overhead
Single managment IP
Single configuration point, configuration pulled to each member
High speed ring stack interconnect
No STP blocking half of ports
Double BW of Uplinks to Distribution
VSS
Redundant Switch Supervisors
Main points
All Control Plane Functions (tables, configs,switching)
2 SUPs per chassis
Used in 4500 /6500 /6800
3 Stanby Supervisor Engine Redundancy Modes
RPR - Reloads modules, initializes,
2 minutes
RPR+ - no reloads, finishes initialization,
30 seconds
SSO (Statefull Switch Over) - fully booted, configs are synced, all tables have info,
1 second
NSF (Non Stop Forwarding)
Another Redundancy feature
Quickly rebuilds RIB, that generates FIB used by CEF.
Verifying StackWise
show switch
All SWs in stack, Master/Member, MACs, Priority #s, HW version, State, Shared MAC
show switch stack-ports
Stack port states (OK/ NOT OK)
show platform stack manager all
In deapth info about the stack
The Need for Logical Switching Architecture
Management overhead
STP blocks half of the uplinks
No direct communication between access switches