Table of Contents

Contents
Introduction

Version and Part Number

System Requirements

Memory Requirements
Hardware Supported
Determining the Software Version

Feature Set for the Catalyst 2948G-L3 Switch Router
Features Not Supported on the Catalyst 2948G-L3 Switch Router
New Features Introduced on the Catalyst 2948G-L3
Switch Router
Caveats

Caveat Symptoms and Workarounds

Error Messages
Related Documentation
Service and Support

Software Configuration Tips on the Technical Assistance Center Home Page

Cisco Connection Online
Documentation CD-ROM

Release Notes for Catalyst 2948G-L3
for Cisco IOS Release 12.0(7)WX5(15a)

January 7, 2000

This document provides the current Catalyst 2948G-L3 software features and caveats for Cisco IOS Release 12.0 (7)WX5(15a).

Contents

These release notes include the following sections:

• Introduction

  • Version and Part Number

• System Requirements

  • Memory Requirements

  • Hardware Supported

  • Determining the Software Version

• Feature Set for the Catalyst 2948G-L3 Switch Router

• Features Not Supported on the Catalyst 2948G-L3 Switch Router

• New Features Introduced on the Catalyst 2948G-L3 Switch Router

• Caveats

  • Caveat Symptoms and Workarounds

• Error Messages

• Related Documentation

• Service and Support

• Cisco Connection Online

• Documentation CD-ROM

Introduction

The Catalyst 2948G-L3 is a high-performance Layer 3 switch router. It is optimized for the campus LAN or the intranet and provides both wirespeed Ethernet routing and switching services.

A Layer 3 switch router performs the following three major functions:

• Packet switching

• Route processing

• Intelligent network services

Compared to other routers, Layer 3 switch routers process more packets faster by using application-specific integrated circuit (ASIC) hardware instead of microprocessor-based engines. Layer 3 switch routers also improve network performance with two software functions---route processing and intelligent network services.

Version and Part Number

The base Cisco IOS Release 12.0(7)WX5(15a) software, which includes RIP and RIP 2, comes with the Catalyst 2948G-L3 switch router. Use license number FR2948GL3-IP to order software that includes OSPF, IGRP, and EIGRP. Use license number FR2948GL3-IPX to order software that includes IPX switching functionality.

System Requirements

This section describes the system requirements for the Catalyst 2948G-L3 switch router for Cisco IOS Release 12.0(7)WX5(15a) and includes the following sections:

• Memory requirements

• Hardware supported

• Determining the software version

Memory Requirements

The standard default memory for the Catalyst 2948G-L3 switch router is 64 MB of SDRAM and 16 MB of onboard Flash ROM.

Hardware Supported

The Catalyst 2948G-L3 switch router is a fixed configuration, multiprotocol 10/100/1000 Ethernet switch router. There are 48 high-density 10/100BaseT Fast Ethernet and two 802.3z Gigabit Ethernet ports on the switch router.

Determining the Software Version

To determine the version of the Cisco IOS software currently running on the Catalyst 2948G-L3 switch router, log in to the switch router and enter the show version EXEC command.

Feature Set for the Catalyst 2948G-L3 Switch Router

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 sets available for the Catalyst 2948G-L3 switch router for Cisco IOS Release 12.0(7)WX5(15a).

Features Not Supported on the Catalyst 2948G-L3 Switch Router

Table 2 lists the features that are not supported on the Catalyst 2948G-L3 switch router.

New Features Introduced on the Catalyst 2948G-L3
Switch Router

Layer 3 switching software on the Catalyst 2948G-L3 switch router features the switching database manager (SDM). SDM resides on the central processor and its primary function is to maintain the Layer 3 switching database in ternary content addressable memory (TCAM). SDM maintains the address entries contained in TCAM in an appropriate order. SDM manages TCAM space by partitioning protocol-specific switching information into multiple regions.

The key benefit of SDM in Layer 3 switching is its ability to configure the size of the protocol regions in TCAM. SDM enables exact-match and longest-match address searches, which result in high-speed forwarding.

For additional information on SDM, refer to the Catalyst 2948G-L3 Software Feature and Configuration Guide.

Caveats

Table 3 lists the caveats that were introduced and resolved on the Catalyst 2948G-L3 switch router for Cisco IOS Release 12.0(7)WX5(15a). In Table 3, "Y" indicates a fixed caveat and "N" indicates an open caveat.

Caveat Symptoms and Workarounds

• CSCdp56448

Symptom: When the interface encapsulation of a port channel subinterface is changed from ISL to 802.1Q, or vice versa, and if this subinterface is the only member of a bridge-group, the console might not respond. However, the system runs normally and the user can access the console using Telnet as long as there is IP connectivity to the system.

Workaround: Before attempting an encapsulation change on the port channel subinterface, do one of the following:

• Remove the bridge-group globally by entering the no bridge bridge_id command.

• Add an additional member to the bridge-group.

• Remove all the members of the port channel.

• CSCdp56078

Symptom: If the encapsulations (ISL or 802.1Q) on interfaces across a link are not the same, the switch might report the following error message:

%FX1000-3-TOOBIG: FX1000(0/0), packet too big (1578), from 0035.0023.010

Workaround: None.

• CSCdp54671

Symptom: When there is very high traffic to the CPU from many interfaces, the CPU might have memory allocation failures for the packet buffers.

Workaround: None.

• CSCdp53262

Symptom: Under extreme conditions, MAC_learn IPC may be lost. A host move under high traffic conditions may result in a missing MAC entry from the Cisco IOS bridging table. When routing over BVI, this might cause loss of connectivity.

Workaround: Enter the clear bridge command.

• CSCdp53223

Symptom: Under heavy traffic conditions, remote MAC entries are not learned consistently on all Fast EtherChannel members. This causes traffic to flood in one direction.

Workaround: Use the clear bridge command to re-sync the remote entries on all ports.

• CSCdp51343

Symptom: When BVI is configured, the following message appears when the Catalyst 2948G-L3 is reloaded.

%CEF hwidb not found for BVI1.

This is a harmless message.

Workaround: None.

• CSCdp49816

Symptom: Invalid root tree pointer for an existing subinterface. This problem is seen very infrequently when a large configuration is copied to the running configuration under heavy traffic loads.

Workaround: Enter the clear bridge command.

• CSCdp49222

Symptom: The total number of IPX networks that can be added on the BVI interfaces is restricted to 32.

Workaround: None

• CSCdp47633

Symptom: A frame greater than 1530 bytes, for example an ISL frame, shows as an output error counter on Gigabit Ethernet interfaces.

Workaround: None.

• CSCdp43594

Symptom: The front panel link LED for Fast Ethernet ports is green for 10/100 Mbps link speed. The link LED is not amber for 10 Mbps as mentioned in the Catalyst 2948G-L3 Hardware Installation Guide. Instead the link LED is green when the link is up, irrespective of the link speed.

Workaround: None

• CSCdp43113

Symptom: An IPX CPU HOG message is displayed when a shut/ no shut is performed on a Fast Ethernet port receiving heavy traffic.

00:26:56: %SYS-3-CPUHOG: Task ran for 5444 msec (1241/370), process = IPX Event Mgr, PC = 600AA140.

After some time all the routes converge back and ping resumes.

Workarounds: None.

• CSCdp42656

Symptom: With constrained multicast flooding (CMF), when a bridge-group member joins and leaves a multicast group, the multicast traffic still gets forwarded out of that bridge member.

Workaround: Use the clear bridge multicast command traffic to stop forwarding traffic out of the bridge member.

• CSCdp38250

Symptom: A CPU HOG condition occurs when the IPX encapsulation is changed on the Gigabit Ethernet port under heavy traffic conditions.

02:27:24: %SYS-3-CPUHOG: Task ran for 2392 msec (515/42), process = Exec, PC = 6003F6CC.

Workaround: None.

• CSCdp37972

Symptom: There is an occurrence of the CPU HOG condition on the Catalyst 2948G-L3 after issuing the no ipx router eigrp command for routes learned via 802.1Q encapsulation on the Gigabit Ethernet port. The Catalyst 2948G-L3 has 5K IPX EIGRP routes with 2500 SAP updates. After a few seconds (approximately 15 seconds) the console prompt returns.

02:44:19: %SYS-3-CPUHOG: Task ran for 6696 msec (1311/3), process = Exec, PC = 600AA140.

Workaround: None.

• CSCdp33630

Symptom: Packets are switched out on the native VLAN, leading to routing by the CPU (with BVI). Untagged packets coming in on the 802.1Q native VLAN are not processed by the microcode. Instead, they are given to the CPU, and the CPU does the processing. This means that high CPU utilization will be seen if untagged packets are received at a high rate on the native VLAN subinterfaces.

Note Generally, only management data, transmitted at a very low rate, would be seen on the native VLAN, since it is mainly used for network management purposes.

Workaround: None.

• CSCdp29353

Symptom: An invalid value is returned for SNMP requests for the ciscoFlashDeviceCard MIB object.

Workaround: None.

• CSCdp27003

Symptom: 64-byte packets transmitted by the Gigabit Ethernet ports do not get updated in the interface statistics. This does not impact performance.

Workaround: None.

• CSCdp24876

Symptom: HSRP performance drops when two Catalyst 2948G-L3 switch routers are configured with BVI.

When HSRP over BVI is configured on both the active and standby HSRP switch routers, and the HSRP routed packets pass through the standby switch router to reach the active router, traffic traversing through this path might experience performance degradation.

Workaround: None.

• CSCdp17494

Symptom: If the interface encapsulation is changed to ISL or 802.1Q while there is traffic on the interface, runts and input error counters might increase. However, after the link is stable and normal operation resumes, these counters should not increase.

Workaround: None.

• CSCdp13515

Symptom: Cisco IOS does not update the IPX routing table when more than two equal hop paths are available, and one of them is shut down.

For example, consider a switch router with three interfaces (I1, I2, and I3). Each of the interfaces has IPX network configured on them, such as N1, N2, and N3 respectively. A remote IPX network R is accessible through N1, N2, and N3. The maximum equal hop paths are set to 2. Hence the IOS routing table shows two destination paths (N1 and N2) in the IPX routing table. When interface I2 is shut down, the IOS routing table should show N1 and N3 as two equal hop paths (since all three paths are equal hop.) However, the routing table shows only N1 as the destination path.

Workaround: Issue the clear ipx route command on the switch router, and the routing table will show N1 and N3 as the destination next hop paths.

• CSCdm73215

Symptom: In configurations with a large number of bridge-groups and bridge-group members, the user might see the following traceback message during reload.

00:00:38: %SYS-3-CPUHOG: Task ran for 3084 msec (437/1), process = CDP Protocol, PC = 6015BD40.

Workaround: None.

• CSCdm57720

Symptom: CDP fails on a Gigabit port with trunking enabled. Cannot receive CDP packets on a trunk port connected to a Catalyst 5000 if CDP packets are coming on a VLAN for which a subinterface is not configured.

Workaround: To receive CDP packets, configure a dummy VLAN subinterface on the trunk port connected to the Catalyst 5000.

Error Messages

This section describes Catalyst 2948G-L3 switch router error messages.

• When attempting to add more routes than the size previously configured with the sdm size command, an error message is displayed.

For example, if the number of IP multicast routes added to SDM exceeds the size configured with the sdm size command, the following error message is displayed:

%LSS-1-SDM: IP Multicast, Region reached limit Cannot accept more entries

Explanation   Cannot accept any more routes in SDM.

Action To rectify this situation, increase the protocol size using the sdm size configuration command and reload the switch router.

• When attempting to add more routes than the Fast Ethernet CAM size allows, the following error message is displayed:

7:28:06:%LSS-4-INTERFACE:(Interface FastEthernet2) CAM reached limit. Cannot accept more route entries

Explanation   Cannot accept more routes in CAM.

Action None.

Related Documentation

This section describes the documentation available for the Catalyst 2948G-L3 switch router. 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:

• Catalyst 2948G-L3 Hardware Installation Guide

• Catalyst 2948G-L3 Software Feature and Configuration Guide

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 If you purchased your product from a reseller, you can access CCO as a guest. CCO is Cisco Systems' primary real-time support channel. Your reseller offers programs that include direct access to CCO services.

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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Posted: Sun May 14 18:45:32 PDT 2000
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