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Release Notes for Catalyst 2948G-L3 and Catalyst 4908G-L3 for Cisco IOS Release 12.0(7)W5(15d)

Release Notes for Catalyst 2948G-L3 and Catalyst 4908G-L3 for Cisco IOS Release 12.0(7)W5(15d)

September 13, 2000

This document provides the current Catalyst 2948G-L3 and Catalyst 4908G-L3 software features and caveats for Cisco IOS Release 12.0(7)W5(15d).

Contents

This document contains the following sections:

Introduction

The Catalyst 2948G-L3 and Catalyst 4908G-L3 are high-performance Layer 3 switch routers that share the same software image. The Catalyst 2948G-L3 is a multiprotocol 10/100/1000 Ethernet switch router. The Catalyst 4908G-L3 is a multiprotocol Gigabit Ethernet switch router.

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

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

Table 1 lists the features and license numbers for each platform.


Table 1: Features and License Numbers by Platform
Platform Features Included License Number

Catalyst 2948G-L3

OSPF, IGRP, EIGRP

FR2948GL3-IP

Catalyst 2948G-L3

IPX

FR2948GL3-IPX

Catalyst 4908G-L3

IPX

FR4908GL3-IPX

System Requirements

This section describes the system requirements for Release 12.0(7)W5(15d) and includes the following sections:

Memory Defaults

Table 2 lists the default Flash and DRAM memory for the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers.

.
Table 2: Default Memory by Platform
Memory Type Catalyst 2948G-L3 Catalyst 4908G-L3

Flash memory

16 MB

16 MB

DRAM

64 MB

64 MB

Hardware Supported

Table 3 lists the interfaces that the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers support.


Table 3: Interfaces Supported by Platform
Layer 3 Switch Routers Interface Types No. of Ports

Catalyst 2948G-L3

10/100 Mbps Fast Ethernet—UTP

48

1 Gbps Gigabit Ethernet

2

Catalyst 4908G-L3

1 Gbps Gigabit Ethernet

8

Software Release Requirement

The Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers share the same software version. To determine the version of the Cisco IOS software currently running on the Catalyst 2948G-L3 or Catalyst 4908G-L3 switch router, log on to the switch router and enter the show version EXEC command.

Feature Set Table

Table 4 lists the Catalyst 2948G-L3 and Catalyst 4908G-L3 software features.


Table 4: Feature Set for the Catalyst 2948G-L3 and
Catalyst 4908G-L3 Switch Routers
Feature Set
Layer 1 Features

10/100BASE-TX half duplex and full duplex (Catalyst 2948G-L3 only)

1000BASE-SX,-LX, and long haul (-LX/LH, -ZX) full duplex

Layer 2 Bridging Features

Layer 2 transparent bridging

Layer 2 Media Access Control (MAC) learning, aging, and switching by hardware

Spanning Tree Protocol (IEEE 802.1D) per bridge group

A maximum of 16 active bridge groups supported

Up to 4K MAC addresses

Integrated routing and bridging (IRB)

Layer 2 entries, IP routing, IP multicast routing, and Novell IPX routing share the 24K content addressable memory (CAM) on the Catalyst 2948G-L3 and the 32K CAM on the Catalyst 4908G-L3

Virtual LAN (VLAN) features

Inter-Switch Link (ISL)-based VLAN trunking

IEEE 802.1Q-based VLAN trunking

Layer 3 Routing, Switching, and Forwarding

IP, IPX, and IP multicast routing and switching between Ethernet ports

Constrained multicast flooding (CMF)

QoS-based forwarding based on IP precedence

Load balancing among equal cost paths based on source and destination IP and IPX addresses

Layer 2 entries, IP routing, IP multicast routing, and Novell IPX routing share the 24K content addressable memory (CAM) on the Catalyst 2948G-L3 and the 32K CAM on the Catalyst 4908G-L3

Up to 18K IP routes

Up to 20K IP host entries

Up to 20K IPX routes

Up to 20K IPX host entries

Up to 128K IP multicast groups

Supported Routing Protocols

Routing Information Protocol (RIP and RIP II)

Interior Gateway Routing Protocol (IGRP)

Enhanced Interior Gateway Routing Protocol (EIGRP)

Open Shortest Path First (OSPF)

Internet Packet Exchange (IPX), RIP, and EIGRP

Protocol Independent Multicast (PIM)—sparse and dense modes

Secondary addressing

Static routes

Classless interdomain routing (CIDR)

Fast EtherChannel (FEC) Features (Catalyst 2948G-L3 only)

Bundling of up to four Fast Ethernet ports

Load sharing based on source and destination IP and IPX addresses of unicast packets

Load sharing for bridge traffic based on MAC address

Inter-Switch Link (ISL) on the Fast EtherChannel

Integrated routing and bridging (IRB) on the Fast EtherChannel

IEEE 802.1Q trunking on the Fast EtherChannel

Up to 16 active FEC port channels

Note   The Catalyst 4908G-L3 does not have Fast Ethernet interfaces, which can be assigned to an EtherChannel
Gigabit EtherChannel (GEC) Features

Bundling the two Gigabit Ethernet ports on the Catalyst 2948G-L3 and up to four active GEC port channels on the Catalyst 4908G-L3

Load sharing based on source and destination IP or IPX addresses of unicast packets

Load sharing for bridge traffic based on MAC address

Inter-Switch Link (ISL) on the Gigabit EtherChannel

Integrated routing and bridging (IRB) on the Gigabit EtherChannel

IEEE 802.1Q trunking on the Gigabit EtherChannel

One active GEC port channel in the Catalyst 2948G-L3 and up to four active GEC port channels in the Catalyst 4908G-L3

Additional Protocols and Features

Bootstrap Protocol (BOOTP)

Cisco Discovery Protocol (CDP) support on Ethernet ports

Cisco Group Management Protocol (CGMP) server support

Dynamic Host Configuration Protocol (DHCP) relay

Hot Standby Routing Protocol (HSRP) over 10/100 Ethernet, Gigabit Ethernet, FEC, GEC, and BVI (Bridge Group Virtual Interface)

Internet Control Message Protocol (ICMP)

Internet Group Management Protocol (IGMP)

Internet Packet Exchange Service Advertisement Protocol (IPX SAP) and SAP filtering

Integrated routing and bridging (IRB) routing mode support

Simple Network Management Protocol (SNMP)

Features Not Supported

Table 5 lists some of the features not supported on the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers.


Table 5: Features Not Supported on the Catalyst 2948G-L3 and the Catalyst 4908G-L3 Switch Routers
Features Not Supported

Layer 2 source MAC address filtering with standard ACL

Layer 3 filtering using ACL:

  • IP simple ACL

  • IP extended ACL

  • TCP ACL based on TCP-precedence, TCP port number, TCP ToS, and TCP flags

  • UDP ACL based on UPD port number

  • ICMP ACL

  • IPX standard ACL

  • Named ACL

  • IPX standard ACL

User Datagram Protocol (UDP) turbo flooding

802.1Q bridging

Border Gateway Protocol (BGP)

Port-based snooping

DEC spanning tree

IPX per packet load balancing

AppleTalk 1 and 2 routing

AppleTalk Routing Table Maintenance Protocol (RTMP)

AppleTalk Update-Based Routing Protocol (AURP)

CGMP over Bridge Group Virtual Interface (BVI)

New Features and Changed Information

This section lists the new features available in each release.

New Features in 12.0(7)W5(15d)

The Catalyst 2948G-L3 can recover a system image using Xmodem and Ymodem protocols.

Note   This feature is new only to the Catalyst 2948G-L3 switch router. The Catalyst 4908G-L3 has this function as part of its basic software features.

New Features in 12.0(7)WX5(15a)

Layer 3 switching software on the Catalyst 2948G-L3 and the Catalyst 4908G-L3 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 and Catalyst 4908G-L3 Software Feature and Configuration Guide.

Caveats

Table 6 lists the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch router caveats by release number and tracking number, and indicates whether or not the caveat has been corrected. In the table, "Y" indicates a fixed caveat and "N" indicates an open caveat.


Table 6: Cisco IOS Release Caveats and Caveats Corrected Reference
DDTS Number 12.0(7)W5(15d) 12.0(7)Wx5(15a)

CSCdr39535

N

N

CSCdr35926

N

N

CSCdr35855

N

N

CSCdr24893

N

N

CSCdr22008

N

N

CSCdr19863

N

N

CSCdp93321

N

N

CSCdp56448

Y

N

CSCdp56078

N

N

CSCdp54671

Y

N

CSCdp53262

N

N

CSCdp53223

N

N

CSCdp51343

N

N

CSCdp49816

N

N

CSCdp49222

N

N

CSCdp47633

N

N

CSCdp43594

Y

N

CSCdp43113

N

N

CSCdp42656

Y

N

CSCdp38250

N

N

CSCdp37972

N

N

CSCdp33630

N

N

CSCdp29353

N

N

CSCdp27003

Y

N

CSCdp24876

N

N

CSCdp17494

N

N

CSCdp13515

N

N

CSCdm73215

N

N

CSCdm57720

N

N

Caveat Symptoms and Workarounds

This sections lists the caveat symptoms and workarounds for the Catalyst 2948G-L3 switch router and the Catalyst 4908G-L3 switch router.

Note   Caveats about Fast Ethernet interfaces do not apply to the Catalyst 4908G-L3 switch router, which has only Gigabit Ethernet interfaces.
  Symptom: Address resolution protocol (ARP) packets are consumed and flooded by IOS even though IP routing is turned off globally.
  Workaround: None.
  Symptom: When IP multicast routing is enabled on a Bridge Group Virtual Interface (BVI), nonReverse Path Forwarding (RPF) IP multicast data packets are discarded. Because of this, some hosts in the same bridge domain might experience loss of connectivity.
  Workaround: None.
  Symptom: When IP multicast routing is not enabled over BVI and BVI is configured to route IP, IP multicast data packets are discarded.
  Workaround: None.
  Symptom: When accessed through Simple Network Management Protocol (SNMP), the QoS mapping table lists an entry with the wrong precedence index value of four. This value must be in a range from zero to three.
  Workaround: None.
  Symptom: When the no negotiation auto command is used on a gigabit port, the link status of that port shows up regardless of the presence of a cable or GBIC on that port.
  Workaround: None.
  Symptom: The no qos switching command is not supported.
  Workaround: Use the qos mapping precedence value wrr-weight weight command to configure the same WRRweight for all the precedence values globally using the CLI.
  Symptom: In the absence of any egress traffic on the master port (one of the following ports: f2, f6, f10, f12, f18, f22, f26, f30, f34, f38, f42, or f46) of the 10/100 Fast Ethernet interface, the Ethernet ports that are in the same epif as the master port learn MAC entries slower than their usual rate. For instance, if port f2 has no egress traffic, ports f1, f3, and f4 learn MAC entries slower than their usual rate.
  Workaround: None.
  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:
  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.
  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.
  Symptom: Under extreme conditions, MAC_learn IPC might be lost. A host move under high traffic conditions might 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.
  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 resync the remote entries on all ports.
  Symptom: When BVI is configured, the following message appears when the switch router is reloaded:
    %CEF hwidb not found for BVI1
  This is a harmless message.
  Workaround: None.
  Symptom: An invalid root tree pointer for an existing subinterface happens very infrequently when a large configuration is copied to the running configuration under heavy traffic loads.
  Workaround: Enter the clear bridge command.
  Symptom: The total number of IPX networks that can be added on the BVI interfaces is restricted to 32.
  Workaround: None
  Symptom: A frame greater than 1530 bytes, for example an ISL frame, shows as an output error counter on Gigabit Ethernet interfaces.
  Workaround: None.
  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
  Symptom: An IPX CPU HOG message is displayed when the shut/ no shut command is issued 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 and ping resumes.
  Workarounds: None.
  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 to stop forwarding traffic out of the bridge member.
  Symptom: A CPU HOG condition occurs when the IPX encapsulation is changed on the Gigabit Ethernet port under heavy traffic conditions.
  Workaround: None.
  Symptom: There is an occurrence of the CPU HOG condition on the switch router after issuing the no ipx router eigrp command for routes learned through 802.1Q encapsulation on the Gigabit Ethernet port. After a few seconds (approximately 15 seconds) the console prompt returns.
  Workaround: None.
  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, because it is mainly used for network management purposes.
  Workaround: None.
  Symptom: An invalid value is returned for SNMP requests for the CiscoFlashDeviceCard MIB object.
  Workaround: None.
  Symptom: The 64-byte packets transmitted by the Gigabit Ethernet ports do not get updated in the interface statistics. This does not impact performance.
  Workaround: None.
  Symptom: HSRP performance drops when two 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.
  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.
  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.
  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.
  Symptom: CDP fails on a Gigabit port with trunking enabled. The switch router will not send CDP packets on a trunk port connected to a Catalyst 5000 when 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 and Catalyst 4908G-L3 switch router error messages.

Note   Error messages about Fast Ethernet interfaces do not apply to the Catalyst 4908G-L3 switch router, which has only Gigabit Ethernet interfaces.
  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

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

Related Documentation

This section describes the documentation available for the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch routers. 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:

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 Cisco TAC Home Page

For helpful tips on configuring Cisco products, follow this path on CCO:

Service & Support: Technical Assistance Center

"Software Technical 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 650-556-8409.

In addition to "Software Technical Tips," the following sections are on the Technical Documents page:

Obtaining Documentation

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

Documentation CD-ROM

Cisco documentation and additional literature is available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.

Ordering Documentation

Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation through our online Subscription Services at http://www.cisco.com/cgi-bin/subcat/kaojump.cgi.

Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).

Obtaining Technical Assistance

Cisco provides Cisco Connection Online (CCO) as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed documents, or by sending mail to Cisco.

Cisco Connection Online

Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online 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.

CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.

Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.

You can access CCO in the following ways:

You can e-mail questions about using CCO to cco-team@cisco.com.

Technical Assistance Center

The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.

To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.

To contact by e-mail, use one of the following:

Language

E-mail Address

 English


 tac@cisco.com


 Hanzi (Chinese)


 chinese-tac@cisco.com


 Kanji (Japanese)


 japan-tac@cisco.com


 Hangul (Korean)


 korea-tac@cisco.com


 Spanish


 tac@cisco.com


 Thai


 thai-tac@cisco.com

In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.

Documentation Feedback

If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.

You can e-mail your comments to bug-doc@cisco.com.

To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:

Cisco Systems, Inc.
Document Resource Connection
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San Jose, CA 95134-9883

We appreciate and value your comments.

This document is to be used in conjunction with the documents listed in the "Related Documentation" section.

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Posted: Wed Sep 13 16:25:17 PDT 2000
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