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High Availability for the Cisco Catalyst
Figure 1
The Cisco Catalyst 6500
Series WS-6503,
WS-C6506, WS-C6509,
WS-C6509-NEBS, and
WS-C6513
All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.
Overview
®
Cisco Catalyst
6500 Series multilayer
switches have become an essential component
of a sound network design in today's enterprise
and service provider environments. Having
such a critical role, the Cisco Catalyst 6500
Series must provide a reliable switching
platform, and offer high performance and
intelligent network services. The high
availability of the Cisco Catalyst 6500 Series
even has the capability to maintain an IP phone
call during supervisor engine failover. This
paper discusses how the Cisco Catalyst 6500
Series provides high system availability
through hardware and software redundancy
features, and focuses specifically on the
following three areas:
Fabric redundancy of the Switch Fabric
Module (SFM)
Supervisor engine redundancy with the Cisco
Catalyst Operating System (Catalyst OS), High
Availability feature, which includes the stateful
protocol redundancy and image versioning
functions
Cisco Systems, Inc.
Page 1 of 19
6500

Series Switches

• Multilayer Switch Feature Card (MSFC)
®
Cisco IOS
Software redundancy
features—Dual Router Mode (DRM),
Configuration-Synchronization
(config-sync), and Single Router
Mode (SRM).
This paper is based on the hybrid software
model for the Cisco Catalyst 6500 Series
(Cisco Catalyst OS on the supervisor engine,
Cisco IOS Software on the MSFC) and not on
the Cisco IOS Software model (native Cisco
IOS Software). All feature set references will
be specifically described as a Cisco Catalyst
OS feature on a supervisor engine or a Cisco
IOS Software feature on an MSFC. The Cisco
Catalyst OS High Availability feature was first
introduced in the Cisco Catalyst OS 5.4 release
and is available for both Cisco Catalyst
Supervisor Engine 1A and Catalyst Supervisor
Engine 2. Support for DRM began in Cisco
IOS Software Release 12.0(7)XE1. The MSFC
config-sync redundancy feature for DRM is
supported in Cisco IOS Software Release
12.1(3a)E4 for both the MSFC and MSFC2.
The MSFC SRM feature was first supported
with Cisco Catalyst OS 6.3.1 and Cisco IOS
Software Release 12.1(8)E2 for the MSFC2.
This paper is the second version of the original
that was written in September 2000. This
version includes some updated sections for
more precise understanding and a discussion of
SRM.
Although component-level redundancy is very
important, a high-availability network design
relies on the proper combination of individual
system redundancy and overall network
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Table of Contents

   Related Manuals for Cisco 6503

   Summary of Contents for Cisco 6503

  • Page 1: Series Switches

    The Cisco Catalyst 6500 Series WS-6503, WS-C6506, WS-C6509, WS-C6509-NEBS, and WS-C6513 All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Overview ® Cisco Catalyst 6500 Series multilayer switches have become an essential component of a sound network design in today’s enterprise...
  • Page 2 SFM as the data path between fabric-enabled line cards. Although the maximum centralized forwarding performance is 15 Mpps in a system of classic and fabric cards, the switch fabric is still used to provide higher bandwidth to the system. If fabric-enabled line cards are installed in a system with no SFM, they will operate in flow-through mode even when classic...
  • Page 3 Channel status—Possible output is “ok,” “sync error,” “CRC error,” “heartbeat error,” “buffer error,” “timeout error,” or “unknown.” Channel status applies only to line cards with fabric and bus connections. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Channel Status Cisco Systems, Inc.
  • Page 4 The capability to configure redundant SFMs provides up to three levels of backplane redundancy, helping to enable continuous operations with minimal impact to network availability in the event of a hardware failure. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Channel Status Cisco Systems, Inc.
  • Page 5 The resulting switchover performance with default settings will take approximately 28 seconds plus the time it takes for the protocols to restart. As an example, a switch with the default time values for the Spanning-Tree Protocol took approximately 58 seconds after the fast switchover to begin forwarding traffic again.
  • Page 6 Important: Do not use these features if a high-availability system is required. 1. Layer 4 protocols include the Layer 4 information in extended IP access lists. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Cisco Systems, Inc.
  • Page 7 The database contains specific system information including module and port states, VLAN information, nonvolatile RAM (NVRAM) configurations, and various protocol-specific data. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Compatible Features...
  • Page 8 The NVRAM configuration of the active supervisor engine is also synchronized between the supervisor engines. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Protocol Database...
  • Page 9 fixes such as upgrading from version 5.5.1 to version 5.5.2. Major releases will not be high-availability compatible. The release notes include a high-availability compatibility listing at the following URL: Cisco Systems, Inc. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 9 of 19...
  • Page 10 Sup-A> (enable) set boot system flash bootflash:cat6000-sup2k8. old .bin Note: Since versioning is enabled, the setting of the boot variable does not cause an image synchronization. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Cisco Systems, Inc.
  • Page 11 MSFCs operate under the DRM and SRM redundancy modes. Cisco recommends that you enable the Cisco Catalyst OS High Availability feature when you run either MSFC redundancy mode. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Cisco Systems, Inc.
  • Page 12 NVRAM of both MSFCs are updated. This allows the configurations on the designated and nondesignated MSFCs to maintain the same configuration without having to manually type each command twice. Cisco Systems, Inc. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 12 of 19...
  • Page 13 files. Feature enhancements such as config-sync have been developed to simplify this process but do not scale. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Cisco Systems, Inc. Page 13 of 19...
  • Page 14 Cisco Express Forwarding entries to the PFC2. Due to differences in routing convergence times, the default of 120 seconds might not be long enough to allow for complete convergence before programming the PFC2 hardware. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Model...
  • Page 15 2. This feature does not apply to the supervisor1a/PFC/MFSCx because the PFC uses flow-based forwarding architecture and all new flows are initially sent to the MSFCx software path. Cisco Systems, Inc. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 15 of 19...
  • Page 16 10.20.1.3 255.255.255.0 no ip redirects interface Vlan30 ip address 10.30.1.3 255.255.255.0 no ip redirects All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Cisco Systems, Inc. Page 16 of 19...
  • Page 17 A second test with one workstation running a File Transfer Protocol (FTP) client and another running an FTP server was run. Transferring a 10-MB file across the switch at Layer 3 during normal operations took an average of 16 seconds. If a supervisor switchover takes place during this same FTP session, the transfer time is an average of 18 seconds.
  • Page 18 The combination of these features, in addition to the system performance and intelligent network services, makes the Cisco Catalyst 6500 Series unparalleled in the industry. Cisco Systems, Inc. All contents are Copyright © 1992–2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 18 of 19...
  • Page 19 • U n i t e d K i n g d o m • U n i t e d S t a t e s • Ve n e z u e l a • Vi e t n a m • Z i m b a b w e All contents are Copyright © 1992–2002, Cisco Systems, Inc. All rights reserved. Catalyst, Cisco, Cisco IOS, Cisco Systems, and the Cisco Systems logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries.

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Catalyst 6500 series

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