Table Of Contents
Release Notes for Catalyst 4840G SLB Switch for Cisco IOS Release 12.0(10)W5(18)
Determining the Software Version
Feature Set for the Catalyst 4840G SLB Switch
Features Not Supported on the Catalyst 4840G SLB Switch
Open Caveats - Release 12.0(10)W5(18)
Software Configuration Tips on the Technical Assistance Center Home Page
Release Notes for Catalyst 4840G SLB Switch for Cisco IOS Release 12.0(10)W5(18)
July 11, 2000
This document provides the current Catalyst 4840G server load balancing (SLB) switch software features and caveats for Cisco IOS Release 12.0(10)W5(18).
Contents
These release notes include the following sections:
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Determining the Software Version
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Introduction
The Catalyst 4840G SLB switch is a high-performance SLB Layer 3 switch.
SLB and Layer 3 switching refers to a class of high performance switches optimized for the campus LAN or intranet, providing both wirespeed Ethernet routing and switching services as well as SLB.
SLB handles the increasing number of visitors and data on your enterprise Web servers. These web servers must provide secure and reliable Web and application hosting services to your Internet or intranet clients.
The SLB switch redistributes the requests or hits from clients evenly among all the servers in the server farm and achieves a balanced load for each server in the server farm. Plus, all physical servers appear as one virtual server, resulting in only a single IP address and a single URL required for an entire server farm.
System Requirements
This section describes the system requirements for the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18).
Memory Requirements
The standard default memory for the Catalyst 4840G SLB switch is 128 MB of SDRAM and 16 MB of onboard Flash ROM. No Flash memory (Flash PC) Card is installed by default. In a future software release the SLB switch can accept an optional 8-, 16-, or 20-MB Type II Flash PC Card.
Hardware Supported
The Catalyst 4840G SLB switch is a fixed configuration, Layer 3 10/100/1000 Ethernet SLB switch. There are 40 high-density 10/100Base-T Fast Ethernet and two GBIC Gigabit Ethernet interfaces on the SLB switch.
Determining the Software Version
To determine the version of the Cisco IOS software currently running on the Catalyst 4840G SLB switch, log in to the SLB switch and enter the show version EXEC command.
Feature Set for the Catalyst 4840G SLB Switch
Cisco IOS software is packaged in feature sets or software images that vary according to the platform. Table 1 lists the Cisco IOS software feature set available for the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18).
Features Not Supported on the Catalyst 4840G SLB Switch
Table 2 lists the features that are not supported on the Catalyst 4840G SLB switch.
Limitations and Restrictions
The following configuration limitations and restrictions apply to the Catalyst 4840G SLB switch:
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Caveats
Table 3 lists the caveats that were introduced and resolved on the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18). In Table 3, "Y" indicates a fixed caveat and "N" indicates an open caveat.
Table 3 Release Caveats and Caveats Corrected Reference
N
N
N
Open Caveats - Release 12.0(10)W5(18)
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You cannot ping a virtual server from the SLB switch where the virtual server is configured.
Symptom: Pinging a virtual server from a client side connection works correctly, but when the ping is issued from the SLB switch where the virtual server is configured, the ping fails.
Workaround: None
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HTTP probe packets do not have the client network address translated.
Symptom: If client NAT is configured on a server farm with HTTP probe configured, the probe packets transmitted still have the SLB switch interface IP address as the source IP address.
Workaround: None
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The command line-interface (CLI) allows you to configure unsupported ipx, mls rp, and cos commands.
Symptom: The switch CLI allows you to configure the following unsupported commands:
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Workaround: None
Related Documentation
This section describes the documentation available for the Catalyst 4840G SLB Switch. Both printed manuals and electronic documents are available.
The most current documentation is available on Cisco Connection Online (CCO) and the Documentation CD-ROM. These electronic documents might contain updates and modifications made after the hard-copy documents were printed.
Use these release notes with the following documents:
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Service and Support
For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco service and support programs, which are described in the section "Service and Support" in the information packet that shipped with your product.
Note
For service and support for a product purchased directly from Cisco, use CCO.
Software Configuration Tips on the Technical Assistance Center Home Page
For helpful tips on configuring Cisco products, follow this path on CCO:
Service & Support: Technical Documents: Hot Tips
"Hot Tips" are popular tips and hints gathered from Cisco's Technical Assistance Center (TAC). Most of these documents are also available from the TAC's Fax-on-Demand service. To access Fax-on-Demand and receive documents at your fax machine, call 888-50-CISCO (888-502-4726). From international areas, call 650-596-4408.
Cisco Connection Online
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can access CCO in the following ways:
WWW: http://www.cisco.com
WWW: http://www-europe.cisco.com
WWW: http://www-china.cisco.com
Telnet: cco.cisco.com
Modem: From North America, 408 526-8070; from Europe, 33 1 64 46 40 82. Use the following terminal settings: VT100 emulation; databits: 8; parity: none; stop bits: 1; and connection rates up to 28.8 kbps.
For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact Cisco's Technical Assistance Center (TAC) at 800 553-2447, 408 526-7209, or tac@cisco.com. To obtain general information about
Cisco Systems, Cisco products, or upgrades, contact 800 553-6387, 408 526-7208, or cs-rep@cisco.com.Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.
This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
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