A New Approach to A New Approach to Stacking: Stacking: Switch Clustering Switch Clustering

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Oct 26, 2013 (3 years and 8 months ago)

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Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.
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A New Approach to
A New Approach to
Stacking:
Stacking:
Switch Clustering
Switch Clustering
Session 1001
Session 1001
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.
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Switch Clustering
Switch Clustering
• Switch Clustering addresses all
the weaknesses of stacking and
provides all of its benefits
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Agenda
Agenda
• Introduction to Stacking
• Switch Clustering
• Summary
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Stacking
Stacking
• Hardware—A dedicated high
performance bus interconnecting
desktop switches in a single
wiring closet
• Software—A single point of
authentication and management of
desktop switches (single IP address)
Definition
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Port
Configuration
Wiring Closet #1
192.20.30.40
192.20.30.40
VLAN
Software
Upgrade
Wiring Closet #2
192.20.30.41
192.20.30.41
Stacking
Stacking
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.
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Benefits and Limitations
Benefits and Limitations
• Low-entry price
and high
performance
• Single IP address
management
• IP address and
port preservation
• Scalable
• Isolated to a single
wiring closet
• No support for
legacy systems
• Limited number of
switches per stack
• No flexibility in
stacking design
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Stacking
Stacking
• Popular and effective wiring
closet technology but has
many limitations
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Agenda
Agenda
• Introduction to Stacking
• Switch Clustering
• Summary
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Switch Clustering
Switch Clustering
• Switch Clustering addresses all
the weaknesses of stacking and
provides all of its benefits
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Switch Clustering
Switch Clustering
• Hardware—logical collection of
switches independent of hardware
interconnect method
• Software—a single point of
authentication and management
with no physical boundary
Definition
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Stacking
Stacking
Port
Configuration
Wiring Closet #1
192.20.30.40
192.20.30.40
VLAN
Software
Upgrade
Wiring Closet #2
192.20.30.41
192.20.30.41
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FEC
192.20.30.40
Catalyst
3500 XL
Catalyst
1900
Catalyst 3508G XL
Catalyst
2900 XL
GigaStack
Backbone
Catalyst 2900 XL
Switch Clustering
Switch Clustering
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Clustering vs. Stacking
Clustering vs. Stacking
• Extend beyond
wiring closet
• Includes legacy
systems
• 16 switches
per cluster
• Admin chooses
cluster members
• Isolated to a single
wiring closet
• No support for
legacy systems
• Limited number of
switches per stack
• No flexibility in
stacking design
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.
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Switch Clustering
Switch Clustering
Details
Details
• Choice of GigaStack dedicated
stacking bus, FEC port groups
or normal Fast Ethernet links for
interconnection
• Catalyst 3500XL, 2900XL and 1900
can be part of the Switch Cluster
• Management via HTTP, Telnet, SNMP
and console connection
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Unit Price
Low-Port Density High-Port Density Gigabit Ethernet
Matrix Switch
• 12 10/100 Ports
• 2 GBIC-Based GE Uplinks
• Cisco Switch
Clustering Support
• Stackable, One RU
• Ideal for SMB Aggregation
• 24 10/100 Ports
• 2 GBIC-Based GE Uplinks
• Cisco Switch
Clustering Support
• Stackable, One RU
• Ideal for Desktop
Connections
Catalyst 3512 XL
Catalyst 3524 XL
Catalyst 3508G XL
• 8 GBIC-Based
GE Ports
• Cisco Switch
Clustering Support
• Stackable, One RU
• Ideal for Stack Matrix
Aggregation
The New Catalyst 3500XL Series
The New Catalyst 3500XL Series
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Catalyst 3500 XL Family
Catalyst 3500 XL Family
• Not replacement for Catalyst 2900 XL
• Three members: 3512 XL, 3524 XL
and 3508G XL
• Two software versions: -A, -EN
• Both versions have Command switch
software for Switch Clustering
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Catalyst 3500 XL Family
Catalyst 3500 XL Family
Technical Highlights
Technical Highlights
• 5 Gbps forwarding rate
• Fixed configuration
• 4 Mb of flash and 8Mb of DRAM
• 8 K CAM
• 10/100/1000 Mb ports only
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Catalyst 3500 XL Family
Catalyst 3500 XL Family
• Static access, multi-VLAN and
dynamic VLAN support on all ports
• All ports support ISL and
802.1Q trunking
• Supports GigaStack, SX and
LX/LH GBICs
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GigaStack Stacking GBIC
GigaStack Stacking GBIC
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GigaStack GBIC
GigaStack GBIC
• Inexpensive GBIC for stacking
• Cable length of up to 1m
• Total cable distance of 9m
Stack a total of nine units
• Shared repeater bus
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GigaStack GBIC
GigaStack GBIC
• Hot swappable
• Auto negotiates half or full
duplex operation
• Keyed—insert one way only
• Tested in Catalyst 3500 XL and
2900 XL gigabit Ethernet module
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Single Daisy-Chain Single Daisy-Chain
Stacking BusStacking Bus
Catalyst 3500
XL or Catalyst
2900 XL with
GE Module
Stacking through
Stacking through
GigaStack GBICs
GigaStack GBICs
• Up to nine switches
can be daisy chained
through GigaStack
GBICs
• Deliver 1Gbps
stacking bus to
the entire stack
• Support redundant
loop back for added
fault protection
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Catalyst 3508G XL
Gigabit
Ethernet
Uplinks
Catalyst 3508G XL
Gigabit
Ethernet
Uplinks
Catalyst 3500 XL or
Catalyst 2900 XL
with GE Module
Star-Wired Matrix with
Star-Wired Matrix with
Catalyst 3508G XL
Catalyst 3508G XL
Star-Wired Matrix StackStar-Wired Matrix Stack
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Software Versions
Software Versions
• Cisco IOS version 11.2(8) SA6
• Command switch version and
regular version
• Command switch version needs
to run on Catalyst 3500 XL or
Catalyst 2900XL with 4Mb flash
• Member switch version runs on
all Catalyst 2900XL switches
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Building a Switch Cluster
Building a Switch Cluster
• A Switch Cluster consists of a
command switch and up to
15 member switches
• Candidate switches are switches that
have not joined the Switch Cluster
• There can be multiple clusters
per network
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Designate a
Command Switch
Not Cluster
Capable
Switch
Switch Cluster Formation
Switch Cluster Formation
Step #1
Step #1
Candidate
Switches
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CDP Protocol Hello
Advertisement
CDP Protocol Hello
Advertisement
CDP Protocol Hello
Advertisement
Not Cluster
Capable
Switch
Candidate
Switches
Switch Cluster Formation
Switch Cluster Formation
Step #2
Step #2
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CDP Neighbor Cache
CDP Neighbor Cache
CDP
Neighbor
Cache
Switch Cluster Formation
Switch Cluster Formation
Step #3
Step #3
Not Cluster
Capable
Switch
Candidate
Switches
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2) Sends List
of Cluster
Capable
Switches
1) Parses through CDP
Cache and Identifies
Cluster Capable Switches
Switch Cluster Formation
Switch Cluster Formation
Step #4
Step #4
Not Cluster
Capable
Switch
Candidate
Switches
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Designate Switches
to Be Added
to Cluster
Switch Cluster Formation
Switch Cluster Formation
Step #5
Step #5
Not Cluster
Capable
Switch
Candidate
Switches
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Switch Cluster Formed
Heartbeat
Switch Cluster Formation
Switch Cluster Formation
Step #5 (Cont.)
Step #5 (Cont.)
Not Cluster
Capable
Switch
Candidate
Switch
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Switch Cluster Formation
Switch Cluster Formation
Summary
Summary
• Designate a Command switch
• CMP hello packets sent
• Parse through CDP neighbor cache
• Network admin selects
cluster members
• Switch Cluster formed and
heartbeats sent
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Command Switch
Command Switch
• Once Switch Cluster is created, all
management is via the command
switch and is redirected to members
• Command switch becomes the
single point of management and
authentication for the Switch Cluster
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Command Switch Roles
Command Switch Roles
• Discovers candidate switches
• Redirects commands, SNMP
and HTTP traffic
• Process TFTP requests for member
switches with no IP address
• Sends heartbeat through
Switch Cluster
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Switch Clustering
Switch Clustering
Technologies Used
Technologies Used
• Existing: Cisco IOS, CDP, HTTP
server, NAT
• New: CDP protocol “hello”, HTTP
redirection, cluster management
protocol (CMP)
• Full integration in Cisco IOS
Cluster commands can be issued
via Cisco IOS command line or
HTTP interface
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Switch Cluster Tools
Switch Cluster Tools
• Cluster Builder
• Cluster View
• Cluster Manager
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Cluster Builder
Cluster Builder
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Cluster View
Cluster View
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Cluster Manager
Cluster Manager
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Cluster Manager Options
Cluster Manager Options
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Device Configuration
Device Configuration
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Port Configuration
Port Configuration
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HTTP Mgmt
Packet
Port Configuration
Port Configuration
Step #1
Step #1
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1) Proxies HTTP
Request from
Management
Station
2) Proxied HTTP
Request with NAT IP
Address Sent to
Member Switches
Port Configuration
Port Configuration
Step #2
Step #2
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Command Executed
Locally and HTTP
Response Sent
Port Configuration
Port Configuration
Step #3
Step #3
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HTTP Proxy
and Sends
HTTP Response
Port Configuration
Port Configuration
Step #4
Step #4
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Port Configuration Summary
Port Configuration Summary
• Network admin HTTP command sent to
command switch
• Command switch proxies and redirects
• Command executed on target switch
and reply to command switch
• Command switch proxies and redirects
to network admin
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Where Can Switch Clusters
Where Can Switch Clusters
Be Implemented?
Be Implemented?
• Multi-story building
• Geographically dispersed campus
• Logically group customers
• Traditional stacking on a per
wiring closet basis
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Switch Clustering
Switch Clustering
• Switch Clustering addresses all
the weaknesses of stacking and
provides all of its benefits
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Agenda
Agenda
• Introduction to Stacking
• Switch Clustering
• Summary
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Summary
Summary
• Stacking is a popular and effective
wiring closet technology but has
many limitations
• Switch Clustering provides all the
benefits of stacking and addresses
all of its weaknesses
• Consider Switch Clustering as a
wiring closet and LAN strategy
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.
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Please Complete Your
Please Complete Your
Evaluation Form
Evaluation Form
Session 1001
Session 1001
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