Table Of Contents
Release Notes for the Cisco 10000 Series ESR
for Cisco IOS Release 12.0(21)SX
February 25, 2002
These release notes provide information about Cisco IOS Release 12.0(21)SX running on the Cisco 10000 series edge services router (ESR). These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode and related documents.
Cisco IOS Release 12.0(21)SX is based on the following previous releases:
•Cisco IOS Release 12.0(21)ST
•Cisco IOS Release 12.0S
For a list of the software caveats that apply to Cisco IOS Release 12.0(21)SX, see the "Caveats in Cisco IOS Release 12.0(21)SX" section.
Use these release notes in conjunction with the Release Notes for Cisco IOS Release 12.0(S) and the cross-platform Release Notes for Cisco IOS Release 12.0.
To review the release notes for Cisco IOS Release 12.0S, go to www.cisco.com and click Technical Documents. Select Release 12.0 from the Cisco IOS Software drop-down menu. Then click Release Notes > Cisco 12000 Series Routers > Cisco 7000 Family and 12000 Series—Release Notes for Release Cisco IOS 12.0 S.
To review the cross-platform Release Notes for Cisco IOS Release 12.0, go to www.cisco.com and click Technical Documents. Select Release 12.0 from the Cisco IOS Software drop-down menu. Then click Release Notes > Cross-Platform Release Notes.
This document contains the following sections:
Upgrading to a New Software Release
Caution In order for Cisco IOS Release 12.0(21)SX to run on the Cisco 10000 series ESR, you must upgrade the eboot image on the router. If you fail to upgrade the eboot image, the router configuration may not load properly, and a checksum error will appear on the console.
For specific information about upgrading your Cisco 10000 series ESR to a new software release, see the Cisco 10000 Series ESR Software Configuration Guide.
For general information about upgrading to a new software release, see the product bulletin Cisco IOS Upgrade Ordering Instructions located at:
For additional information about ordering Cisco IOS software, refer to the Cisco IOS Software Releases URL:
Upgrading Cisco IOS Software from Earlier Cisco IOS Releases
Caution If you are upgrading your Cisco 10000 series ESR from Cisco IOS Release 12.(14)SL or from earlier 12.0(x)SL-based releases, read this section.
Before you upgrade to Cisco IOS Release 12.0(21)SX, save your current configuration file. If you decide to re-install Release 12.0(14)SL, or an earlier release, you must also re-install the configuration file associated with that release. This is because some BGP configuration-file entries in Release 12.0(21)SX are not compatible with Release 12.0(14)SL or earlier releases.
For Cisco IOS Release 12.0(21)SX to run properly on the Cisco 10000 series ESR, the Performance Routing Engine (PRE) installed in the chassis must be the PRE1 version (Part Number ESR-PRE1). To verify the currently installed PRE in the chassis, invoke the show version command.
New Features in Cisco IOS Release 12.0(21)SX
This section lists new features and improvements that are supported in Cisco IOS Release 12.0(21)SX.
Cisco 24-Port E1 Line Card Description
The Cisco 24-port E1 line card is a full-slot line card with 24 ports which you can configure as E1 interfaces. Each port on the line card provides one or more interfaces that can be configured as framed (channelized) or unframed (unchannelized) interfaces.
The following E1 features are supported on the Cisco 24-port E1 line card:
•European 2.048 Mbps ITU G.703 and G.704 serial interfaces
•Cyclic Redundancy Check (CRC4) and non-CRC4 framing modes
•High-Level Data Link Control (HDLC) protocol, Frame Relay protocol, and Point-to-Point Protocol (PPP) encapsulations
•Nx64 Kbps channel bandwidths in channelized E1 mode (where N = 0 < N < 31) and a 2048 Kbps single channel bandwidth in unframed E1 mode
•Clock source selected on a per-port basis—internal or external (line)
•Programmable National Reserved bits
•High Density Bipolar 3 (HDB3) line encoding
Cisco 10000 ESR MIB Enhancements
MIB enhancements in Cisco IOS Release 12.0(21)SX provide enhanced management features that enable the router to be managed through the Simple Network Management Protocol (SNMP). These enhanced management features allow you to:
•Use SNMP set and get requests to access information in Cisco 10000 series ESR MIBs
•Reduce the amount of time and system resources required to perform functions like inventory management and bulk data transfers
Other benefits include:
•A standards-based technology (SNMP) for monitoring faults and performance on the router
•Support for all SNMP versions (SNMPv1, SNMPv2c, and SNMPv3)
•Notification of faults, alarms, and conditions that can affect services
•The ability to aggregate fault and alarm information for multiple entities
Cisco 10000 Series ESR Software Features
Table 1 lists the features supported in the Cisco 10000 series ESR.
Limitations and Restrictions
This section describes any limitations and restrictions that you should review before you use the Cisco 10000 series ESR.
The MIBs described in the Cisco 10000 Series ESR MIB Specifications Guide have all been approved. If a MIB is revised in a later Cisco IOS release and new functionality is added, the Cisco 10000 series ESR might not support the new functionality; however, the previous MIB functionality always remains intact on the router.
Controlling the Rate of Logging Messages
It is important that you limit the rate that system messages are logged by the Cisco 10000 series ESR. This avoids a situation in which the router becomes unstable and the CPU is overloaded. Use the logging rate-limit command to control the output of messages from the system.
We recommend that you configure the logging rate-limit command as follows:Router(config)# logging rate-limit console all 10 except critical
This command limits the rate of messages to the console to 10 per second, except for messages with critical priority (level 3) or greater.
For more information on the logging rate-limit command, see the Cisco IOS Configuration Fundamentals Command Reference.
Testing Performance of High-Speed Interfaces
The Cisco 10000 series ESR has multiple queues for all classes of traffic over high-speed interfaces. The software selects a queue based on the source and destination address for the packet. This ensures that a traffic flow always uses the same queue and the packets are transmitted in order.
When the Cisco 10000 series ESR is installed in a real network, the high-speed interfaces work efficiently to spread traffic flows equally over the queues. However, using single traffic streams in a laboratory environment may result in less-than-expected performance.
Therefore, to ensure accurate test results, you should test the throughput of the gigabit Ethernet, POS, or ATM uplink with multiple source or destination addresses.
Tip To determine if traffic is being properly distributed, use the show hardware pxf cpu queue command.
This section contains important issues that you should be aware of with Cisco IOS Release 12.0(21)SX and previous releases.
Frame Relay and PPP Sessions
You can run up to 4200 Frame Relay sessions or 1300 PPP sessions, and you can configure up to 800 BGP peers on the Cisco 10000 series ESR. The router also supports up to 512 Multilink Point-to-Point (MLP) protocol sessions.
Note Each T1 interface in an MLP bundle represents a single PPP session. Thus, if you configure 130 MLP bundles of 10 T1 interfaces, each results in 1300 PPP sessions (which is the maximum number of PPP sessions that are supported on the Cisco 10000 series ESR).
Cisco Discovery Protocol
Unlike other Cisco routers, the Cisco Discovery Protocol (CDP) on the Cisco 10000 series ESR is disabled by default. You can enable CDP on an interface using the cdp enable command.
Caveats in Cisco IOS Release 12.0(21)SX
Table 2 lists the open caveats in Cisco IOS Release 12.0(21)SX.
Resolved Problems in Cisco IOS Release 12.0(21)SX
This section lists problems that are fixed in Cisco IOS Release 12.0(21)SX.
An error can occur with management protocol processing. For more information, go to the following URL:
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
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Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
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To access Cisco.com, go to the following website:
Technical Assistance Center
The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Website
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:
P3 and P4 level problems are defined as follows:
•P3—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
•P4—You need information or assistance on Cisco product capabilities, product installation, or basic product configuration.
In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.
To register for Cisco.com, go to the following website:
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:
Contacting TAC by Telephone
If you have a priority level 1 (P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:
P1 and P2 level problems are defined as follows:
•P1—Your production network is down, causing a critical impact to business operations if service is not restored quickly. No workaround is available.
•P2—Your production network is severely degraded, affecting significant aspects of your business operations. No workaround is available.
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