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© 1999, Cisco Systems, Inc.
A New Approach to Stacking: Switch Clustering Session 1001 1001 0974_...
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© 1999, Cisco Systems, Inc.
A New Approach to Stacking: Switch Clustering Session 1001 1001 0974_05F9_c2
© 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr
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Switch Clustering
• Switch Clustering addresses all the weaknesses of stacking and provides all of its benefits
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© 1999, Cisco Systems, Inc.
Agenda
• Introduction to Stacking • Switch Clustering • Summary
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Stacking Definition • 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) 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
Stacking Wiring Closet #1 Port Configuration
VLAN
Software Upgrade
192.20.30.40
Wiring Closet #2 192.20.30.41
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Benefits and Limitations
• Low-entry price and high performance • Single IP address management • IP address and port preservation • Scalable 1001 0974_05F9_c2
• Isolated to a single wiring closet • No support for legacy systems • Limited number of switches per stack • No flexibility in stacking design 7
© 1999, Cisco Systems, Inc.
Stacking
• Popular and effective wiring closet technology but has many limitations
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Agenda
• Introduction to Stacking • Switch Clustering • Summary
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© 1999, Cisco Systems, Inc.
Switch Clustering
• Switch Clustering addresses all the weaknesses of stacking and provides all of its benefits
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Switch Clustering Definition • Hardware—logical collection of switches independent of hardware interconnect method • Software—a single point of authentication and management with no physical boundary 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
Stacking Wiring Closet #1 Port Configuration
VLAN
Software Upgrade
192.20.30.40
Wiring Closet #2 192.20.30.41
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Switch Clustering
Catalyst 1900
GigaStack
Catalyst 3500 XL
192.20.30.40 Backbone Catalyst Catalyst 2900 XL
2900 XL
FEC Catalyst 3508G XL
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© 1999, Cisco Systems, Inc.
Clustering vs. Stacking
• Extend beyond wiring closet
• Isolated to a single wiring closet
• Includes legacy systems
• No support for legacy systems
• 16 switches per cluster
• Limited number of switches per stack
• Admin chooses cluster members
• No flexibility in stacking design
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Switch Clustering 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 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
The New Catalyst 3500XL Series Catalyst 3508G XL
Catalyst 3524 XL
Unit Price
Catalyst 3512 XL
• 12 10/100 Ports • 2 GBIC-Based GE Uplinks • Cisco Switch Clustering Support • Stackable, One RU • Ideal for SMB Aggregation
Low-Port Density 1001 0974_05F9_c2
• 24 10/100 Ports • 2 GBIC-Based GE Uplinks • Cisco Switch Clustering Support • Stackable, One RU • Ideal for Desktop Connections
High-Port Density
© 1999, Cisco Systems, Inc.
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• 8 GBIC-Based GE Ports • Cisco Switch Clustering Support • Stackable, One RU • Ideal for Stack Matrix Aggregation
Gigabit Ethernet Matrix Switch
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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 1001 0974_05F9_c2
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Catalyst 3500 XL Family 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 1001 0974_05F9_c2
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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 1001 0974_05F9_c2
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GigaStack Stacking GBIC
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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 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
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 1001 0974_05F9_c2
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Stacking through GigaStack GBICs Single Daisy-Chain Stacking Bus
• Up to nine switches can be daisy chained through GigaStack GBICs
Catalyst 3500 XL or Catalyst 2900 XL with GE Module
• Deliver 1Gbps stacking bus to the entire stack • Support redundant loop back for added fault protection 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
Star-Wired Matrix with Catalyst 3508G XL Star-Wired Matrix Stack Catalyst 3508G XL
Gigabit Ethernet Uplinks
Catalyst 3508G XL
Gigabit Ethernet Uplinks
Catalyst 3500 XL or Catalyst 2900 XL with GE Module 1001 0974_05F9_c2
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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 1001 0974_05F9_c2
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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 1001 0974_05F9_c2
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Switch Cluster Formation Step #1
Not Cluster Capable Switch
Designate a Command Switch
Candidate Switches
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Switch Cluster Formation Step #2
CDP Protocol Hello Advertisement
Not Cluster Capable Switch
CDP Protocol Hello Advertisement CDP Protocol Hello Advertisement
Candidate Switches
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Switch Cluster Formation Step #3
CDP Neighbor Cache CDP Neighbor Cache
Not Cluster Capable Switch
CDP Neighbor Cache
Candidate Switches
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Switch Cluster Formation Step #4
1) Parses through CDP Cache and Identifies Cluster Capable Switches
Not Cluster Capable Switch
2) Sends List of Cluster Capable Switches
Candidate Switches
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Switch Cluster Formation Step #5
Not Cluster Capable Switch Designate Switches to Be Added to Cluster Candidate Switches
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Switch Cluster Formation Step #5 (Cont.)
Heartbeat
Not Cluster Capable Switch
Candidate Switch
Switch Cluster Formed
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Switch Cluster Formation 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 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
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 • Discovers candidate switches • Redirects commands, SNMP and HTTP traffic • Process TFTP requests for member switches with no IP address • Sends heartbeat through Switch Cluster 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
Switch Clustering 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 1001 0974_05F9_c2
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Switch Cluster Tools
• Cluster Builder • Cluster View • Cluster Manager
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Cluster Builder
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Cluster View
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Cluster Manager
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Cluster Manager Options
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Device Configuration
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Port Configuration
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Port Configuration Step #1
HTTP Mgmt Packet
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Port Configuration Step #2
2) Proxied HTTP Request with NAT IP 1) Proxies HTTP Request from Address Sent to Management Member Switches Station
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Port Configuration Step #3
Command Executed Locally and HTTP Response Sent
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Port Configuration Step #4
HTTP Proxy and Sends HTTP Response
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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 1001 0974_05F9_c2
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Where Can Switch Clusters Be Implemented?
• Multi-story building • Geographically dispersed campus • Logically group customers • Traditional stacking on a per wiring closet basis 1001 0974_05F9_c2
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© 1999, Cisco Systems, Inc.
Switch Clustering
• Switch Clustering addresses all the weaknesses of stacking and provides all of its benefits
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© 1999, Cisco Systems, Inc.
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Agenda
• Introduction to Stacking • Switch Clustering • Summary
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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 1001 0974_05F9_c2
© 1999, Cisco Systems, Inc.
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Please Complete Your Evaluation Form Session 1001
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