Cisco Interface Processors

Field Notice: CX-TRIP Token Ring Data Corruption Recall Announcement

Updated May 6, 1999

Updated March 26, 1999

Updated February 25, 2000

March 1, 1999

Products Affected




Affected units -

Serial number range: 06484641 - 10991262.

Hardware revision: 1.04

Shipped between: 8/97 - 11/98


Affected units -

Serial number range: 06484641 - 10991262.

Hardware revision: 1.04

Shipped between: 8/97 - 8/98


Note1: Date range applies only to units shipped direct from Cisco.

Note2: The hardware revision may appear as "1.4" on some unit labels. Hardware revision 1.4 is equivalent to 1.04.

Problem Symptoms

The symptom of this problem is occasional Token Ring packets with corrupted data payloads. The packet's starting delimiter and physical trailer fields are not affected. For packets emitted by an interface, the packet frame check sequence (FCS) is recalculated after the corruption occurs. So, transmitted frames with corruption will not generate FCS errors and will probably not be detected by layer 2 protocols. For packets received by an interface, the corruption occurs after the FCS is stripped. Depending on the location of the corruption, the router may either discard the packet or forward it on undetected.

The data corruption can take the form of omitted data bytes, inserted "garbage" data bytes, or an erroneous repeat of a preceding block of "good" data bytes and may appear at any offset within the frame data.


This problem occurs due to a margin condition in the direct memory access (DMA) controller component of the CX-TRIP products. The DMA controller component is responsible for transferring Token Ring packets to and from the router's packet memory. Cisco has discovered that the DMA controller components used on CX-TRIP units in the affected serial number range have a slightly higher internal speed than those on unaffected units. This higher speed can result in DMA system operation outside of the system's designed parameters and can lead to packet data corruption.


CX-TRIP boards with only one port operating will not have this problem. Two or more CX-TRIP ports must be connected and active (not shutdown) for the problem to occur. As a temporary workaround, spare CX-TRIP boards may be used to separate Token Ring segments so that each board contains only one active port. Affected units can also be replaced with other Token Ring solutions such as the VIP2 card with PA-4R, PA-4R-FDX, or PA-4R-DTR Token Ring port adapters, if a customer has spares of those units available and the appropriate software installed on the router. Those units are not affected by this problem. Note: VIP2/PA-4R-xx replacements are not part of the no-charge upgrade program. The problem solution requires a hardware modification to the CX-TRIP board. This modification may only be performed at the factory. As a solution, customers may obtain replacement CX-TRIP boards that have already been upgraded to prevent the problem (see "Upgrade Program" section below). Units at hardware revision 1.05 and later have already had the corrective fix applied.





Related RCN: Describes hardware changes required to fix the CX-TRIP data corruption problem.


To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.




Related DDTs: Describes details of CX-TRIP data corruption failures.

Upgrade Program

Beginning March 1, 1999, customers may obtain replacement Cisco CX-TRIP products at no charge through Cisco's Upgrades group.

For customers requiring replacement of two-port CX-TRIP cards (CX-TRIP2), Cisco may choose to replace those cards with equivalent four-port CX-TRIP cards (CX-TRIP4). The CX-TRIP4 is identical to the CX-TRIP2 in every way except that is has four Token Ring interface ports instead of two. No additional hardware or software changes are required for this substitution.

Customers who purchased Cisco CX-TRIP products from a reseller or distributor should contact the reseller or the distributor directly to arrange for replacement.

Customers who purchased Cisco CX-TRIP products directly from Cisco and have verified that their products fall within the affected serial number range should contact Cisco Systems Technical Assistance Center (TAC) to arrange replacing their product. The Cisco Systems TAC can be reached at (800) 553-24HR, (408) 526-7209, or via e-mail to

How To Identify Hardware Levels

This field notice applies only to those CX-TRIP4 and CX-TRIP2 units with hardware revision 1.04 and serial numbers in the ranges listed above in the "Products Affected" section. No other products are affected.

The serial number and hardware revision ("HW rev") for installed CX-TRIP4 and CX-TRIP2 units may be discovered by issuing the Cisco IOS show diag exec command on a running Cisco 7xxx family router. Following is sample output of the show diag command:

Slot 6:
        Physical slot 6, ~physical slot 0x9, logical slot 6, CBus 0
        Microcode Status 0x0
        Master Enable, LED, WCS Loaded
        Board is analyzed 
        EEPROM format version 1
        TRIP controller, HW rev 1.04, board revision M0
        Serial number: 09962205  Part number: 73-0973-03
        Test history: 0x00        RMA number: 00-00-00
        Flags: cisco 7000 board; 7500 compatible
        EEPROM contents (hex):
          0x20: 01 05 01 04 00 98 02 DD 49 03 CD 03 00 00 00 00
          0x30: B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        Slot database information:
        Flags: 0x4      Insertion time: 0x1128 (14:57:16 ago)

The serial number for uninstalled units may be discovered by locating either the "serial no" label on the original box or the orange serial number bar code label on the board itself. The orange serial number label on the board is located on the card edge opposite the faceplate, near the black edge connector.

The hardware revision for uninstalled units can be found on the "serial no" label on the original box as described above. Alternately, the hardware revision can be determined by inspecting the part number revision label on the edge of the TRIP board. The part number revision label is located on the edge near the Cisco logo and copyright statement. The actual hardware revision is determined by translating the part number revision label text as follows:

CX-TRIP4 part number revision "73-0973-03 REV-M0" = HW rev 1.04

CX-TRIP2 part number revision "73-1145-03 REV-M0" = HW rev 1.04

All other part number revision label values indicate earlier or later hardware revisions and are NOT affected by this field notice.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods: