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September 8, 1998
This document describes the problems fixed in the Catalyst 3900 switch main image 3.0(3) release and in the ATM firmware image 1.2(4) release. It also lists the known (open) problems for these releases and contains information about the Catalyst 3900 and Catalyst 3920 Token Ring switches that was not included in the User Guides. This document is available on the Cisco Connection Documentation CD-ROM or in print.
Sections in this document include the following:
This section lists problems that have been resolved in the 3.0(3) release of the Catalyst 3900 series main image and the 1.2(4) release of the ATM firmware image.
The following is a list of problems found in the Catalyst 3900 series main image that have been resolved in the 3.0(3) release.
| Problem Identifier | Problem Description |
|---|---|
CSCdj49835 | In some situations, selecting End on the Message Log Information panel does not scroll the message log display entirely to the end of the messages. |
CSCdj53766 | The Catalyst 3900 does not reduce STE frames and could forward a frame back onto a ring that it has already traversed. To avoid this problem, enable the IBM Spanning Tree in the TrBRF. For more information, please contact the Technical Assistance Center. |
CSCdj85215 | Resetting a Catalyst 3900 series switch with diagnostics from the Reset panel generates an "Assert Failed" error message. |
CSCdj87014 | If you have multiple boxes in a redundant ISL configuration with the Cisco Spanning-Tree running on the default TrCRF (1003), enabling the IEEE Spanning-Tree on the default TrBRF (1005) will cause all ISL ports to go to forwarding state. |
CSCdj89368 | If RMON is enabled, software updates cannot be downloaded via TFTP. |
CSCdj89370 | In a switch containing an ISL uplink, if the switch is running in a redundant configuration and you delete the TrCRFs in a preferred TrBRF, a loop might be created if only one TrCRF remains configured for that TrBRF. |
CSCdk01003 | In a stack of switches connected to a root switch via ISL uplinks, the spanning-tree protocol running on the TrBRF in the secondary stack switch does not block the ISL port. |
CSCdk02187 | Two switches connected via ISL uplinks exhibit spanning-tree problems during heavy traffic. |
CSCdk03302 | Cisco Spanning-Tree running on the default TrCRF (1003) fails to block a port when two switches are connected via two ISL uplinks. This situation results in a network loop. |
CSCdk03346 | During initialization, an ISL port might forward traffic to all ports, including the port on which the traffic was received. |
CSCdk04628 | CPU congestion handling can cause some directly connected TFTP servers to hang. |
CSCdk05527 | Filters cannot be defined based on DSAP values 0x00 and 0xAA. |
CSCdk07940 | The source address from frames sent to known destination addresses is not being learned, resulting in the flooding of traffic being forwarded to those addresses. |
CSCdk07966 | Configuring more than 16 TrCRFs in a TrBRF on a Catalyst 3900 that contains an ISL uplink will cause the switch to continuously reboot during power on. |
CSCdk08870 | In a switch containing an ISL and ATM uplink, the traffic received from the ATM port is corrupted by the ISL port as it forwards the frames. |
CSCdk11972 | Unable to specify the TrBRF that has the IP address you want to use in CDP messages or as the IP address of the management VLAN to be passed to ATM switches via ILMI. |
CSCdk12527 | In a stack of switches containing an ISL uplink, ARE frames received on the default TrBRF (1005) are incorrectly forwarded by the ISL uplink. As a result, the frames are dropped by the other switches in the stack. |
CSCdk12577 | A Catalyst 3900 switch with the IEEE Spanning-Tree running on the TrBRF level might transmit topology change messages containing the incorrect source MAC address. |
CSCdk15557 | In a stack of switches, viewing the Port Spanning Tree Parameters panel for a TrCRF for which there are no ports configured causes the Catalyst 3900 console to hang. |
CSCdk19937 | In a stack of switches connected via ATM uplinks, the Spanning-Tree Protocol does not resolve network loops. |
CSCdk22040 | During address learning, if the number of currently active stations reaches 9400, the switch will display an error message indicating that the address tables have been corrupted and will reset. |
CSCdk26571 | Receiving VTP V1 frames causes the Catalyst 3900 switch to go into VTP Transparent mode. |
CSCdk34992 | In a stack of switches, displaying the VLAN Statistics panel for a TrBRF or TrCRF that spans the stack can result in the return of incorrect VLAN statistics or in a system crash. |
CSCdk35457 | MTU sizes larger than 4472 are not supported by the ATM module. Therefore, frames received with MTUs exceeding 4472 might be corrupted and buffers lost. |
CSCdk35465 | Downloading the Catalyst 3900 main image via TFTP might fail due to insufficient memory. |
CSCdk35534 | In a 2-switch stack connected via an ISL uplink, the first switch in the stack resets during heavy traffic. |
CSCdk35865 | When a Catalyst 3900 switch with an ISL uplink is made a VTP Client for the first time, VTP advertisement requests are not generated, resulting in the switch never receiving a VTP configuration update. |
CSCdk38236 | In a Catalyst 3900 with an ISL uplink, the ISL port stops transmitting. |
CSCdk38898 | TrBRFs configured on the Catalyst 3900 switch do not send BDPUs to the bridge functional address when running the IEEE Spanning Tree even after "Yes" has been specified for the IEEE STP uses Bridge Functional Address field on the Spanning Tree for a TrBRF panel. |
The following is a list of problems found in the Catalyst 3900 ATM firmware image that have been resolved in the 1.2(4) release.
| Problem Identifier | Problem Description |
|---|---|
CSCdk13983 | Module timers run too fast. As a result, timeout periods are shorter than they are actually configured for. |
CSCdk23442 | MAC addresses and route descriptors are aged out regardless of their respective usage. As a result, a Data Direct VCC might be torn down and reestablished. |
This section lists the currently known problem in this release.
Problem Identifier: CSCdj89372
Problem Description: The default Ethernet VLAN (1) is used to carry VTP traffic across an ISL cloud. Because the Spanning-Tree Protocol is not run on the default Ethernet VLAN, if an ISL cloud is configured redundantly and all switches are in VTP Client or Transparent modes a loop will form.
Recommended Action: Configure at least one of the switches in a redundant ISL configuration as the VTP Server.
This section contains information that was not included in the Catalyst 3900 or Catalyst 3920 User Guides. The headings in this section correspond with the applicable section titles in the documentation.
The Catalyst 3900/3920 Token Ring switches support source-route bridging (SRB), source-route transparent bridging (SRT), and source-route switching. You can choose to enable either SRB or SRT for the logical connections between the TrCRF and the TrBRF. Source-route switching is used for frame forwarding within the TrCRF and is always enabled.
The description of the Token Ring Ring Station Group is incorrect. This section should read as follows:
The Catalyst 3900 series Token Ring switches support the ringStationControlTable portion of the Token Ring Ring Station Group. This support allows a Catalyst 3900 series switch to gather segment information from each ring segment to which it is attached. This segment information includes Ring State, Beacon Sender, Beacon NAUN, and Active Monitor MAC Address, as well as Station Order Changes.
If you plan to interconnect your Catalyst 3900 with a Catalyst 5000, your Catalyst 5000 should have Supervisor Card revision 2, or later, with NMP version 3.0(201), or later. Also, because VTP pruning is currently not supported by the Catalyst 3900, if you extend a TrBRF from a Catalyst 3900 to a Catalyst 5000 that is using VTP pruning, you must set the TrBRF to ineligible on the Catalyst 5000.
CiscoView shows the burned-in MAC address and the configured locally administered address (LAA) in non-canonical format. The Switch Configuration panel allows you to choose whether the MAC addresses displayed on the console panels are in canonical or non-canonical format. The default is non-canonical.
The Hw Rev column on the Module Information panel has been updated to reflect the revision numbers of the module and the associated ASICs. For the base switch and the Token Ring fiber and copper expansion modules, the hardware revision is now displayed in the format x.y.z, where:
Changing the Local Mode field on the VTP Administrative Configuration panel from Client to Transparent or Server generates the following message when the number of defined VLANs is greater than the amount that can be stored in NVRAM:
Mode must be Client. There are too many VLANs to store on local device.
Performing the same procedure via an SNMP manager generates the following message:
WRONG_VALUE_ERROR.
Modifications have been made to the VLAN Parameter Configuration panel for a TrBRF that prevent you from configuring an MTU size larger than 4472 for a TrBRF that contains an ATM port. This modification has been made because the Catalyst 3900 ATM module does not support MTUs greater than 4472.
With the Catalyst 3900 main image release 3.0(3), specifying an MTU greater than 4472 for a TrBRF that contains an ATM port will result in the ATM port being removed from the TrBRF and the following message being displayed:
ATM Port removed from TrBRF since BRF MTU > 4K
port=25, crf=1003, brf=1005, vlanmtu=8144
As stated in the "Adding or Changing TrCRF VLAN Parameters" section of the User Guide, to enable ring number learning, the Local Mode (on the VTP Administrative Configuration panel) must be set to Transparent (which is the default) and the ring number must be set to auto (which is the default). If you have set the local mode to Client or Server, you cannot set the ring number to auto.
With this release of the Catalyst 3900 main image, if you have previously set the Local Mode of the default TrCRF (1003) to Transparent and the ring number to auto, you can now change the Local Mode while ring number learning is in progress. If the default TrCRF is the only TrCRF for which the ring number is set to auto, the ring number will automatically be set to the learned ring number or, if the ring number has not been learned, it will be set to 0xCCC.
Attempting to assign a port to a TrCRF to which remote ports are already assigned generates the following message:
Error - TrCRF has remote ports assigned
Attempting the same procedure via an SNMP manager generates the following message:
WRONG_VALUE_ERROR
An additional option, Management VLAN, has been added to the SNMP Configuration panel. This option enables you to select the VLAN that has the IP address you want to use for the following:
When configuring a port to operate in adaptive cut-through, you can specify a threshold for errored frames. If this threshold is exceeded, the port will transition from cut-through to store-and-forward mode. Errored frames include frames with CRC errors, aborted frames, and frames that are considered too short.
The ATM LEC Setup panel has been modified to indicate that the Catalyst 3900 ATM module supports MTUs up to 4472.
In the User Guide, the possible values listed for the MTU field are 1500, 4472, 8144, and 17800. With this release of the Catalyst 3900 main image, the possible values for the MTU field on the ATM LEC Setup panel are 1500 and 4472.
The Port Configuration panel for an ISL port has been updated to reflect the operation mode of the port. This field, labeled Operation Mode, is display only and the only possible value currently is FDX trunking.
You can now define filters based on the DSAP values 0x00 and 0xAA. If a DASP of 0xAA is included in a protocol filter, all SNAP frames will be filtered regardless of any EtherType currently specified. If you attempt to define a filter based on both an EtherType and the DSAP value 0xAA the following message is generated:
Warning - Ethertype filtering will be ignored while filtering with DSAP 0xAA.
For a list of additional SAP values on which you can base filters, refer to the "Service Access Points" section of the "Codes and IDs" appendix of the User Guide.
Additional changes to the Protocol Class Assignment panel include the following:
As the required hardware has not become available in the marketplace to support passive monitoring of network traffic, the Catalyst 3900 no longer allows the configuration of passive SPAN.
As mentioned in the User Guide, you must place your SPAN port in a separate TrCRF and TrBRF that contains no other ports. If you plan to use SPAN, we recommend that you create a TrCRF and TrBRF upon initial configuration specifically for this purpose. It is also a good idea to leave a port on the switch assigned to this TrCRF for the purposes of future SPAN use.
The Filters & Port Security panel has been modified to make it easier to configure MAC address and protocol filters. As a result a new panel, the MAC Address Filters panel, has been added and the new options available on the Filters & Port Security panel are:
The following options that were displayed on the Filter & Port Security panel are now available on the MAC Address Filters panel:
For more information about these options, refer to the "Limiting Scope and Access" section of the User Guide.
Two fields on the General Statistics panel for a port have been modified to clarify the information the counters are reflecting. The Frames Filtered - Addr and Frames Filtered DSAP fields in the left-hand column have been changed to the following:
Two fields on the Frame Forwarding Statistics panel for an ATM port have been modified to clarify the information the counters are reflecting. The Frames Filtered - Addr and Frames Filtered - DSAP fields in the left-hand column have been changed to the following:
Fields identifying the Spanning-Tree Protocol running at the TrBRF and TrCRF levels have been added to the Current Spanning Tree Information panel.
When viewing the Spanning-Tree parameters for a TrBRF, the protocol running per TrCRF is identified in the Ptcl column. Possible values are IBM, IEEE, or blank.
When viewing the Spanning-Tree parameters for a TrCRF, the protocol running is identified in the Protocol field. Possible values for the Protocol field are Cisco and IEEE.
When changes are made to the Catalyst 3900 software, the new image is posted to CCO. You can then obtain a copy of the image and download it to your switch.
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.
For service and support for a product purchased directly from Cisco, use CCO.
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:
For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
Documentation for Cisco products is available in three forms: in a CD-ROM package, printed books, and on the World Wide Web. You have the option of subscribing to the CD ROM package through an update service. Or you can order printed documentation at an additional cost. Refer to the information packet included with the router for detailed ordering information. You can also access Cisco documentation on the World Wide Web URL http://www.cisco.com. 
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