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Cisco MGX 8800 Series Switches

CSCdx59414 PXM-UI-S3 Ethernet Interface Can Drop Packets


June 24, 2003



Products Affected

Product Top Assembly Printed Circuit Assembly Comments
Part Number Rev. Part Number Rev.
PXM-UI-S3   800-08932-02, -01   D, C, B, A   73-5668-02   D, C, B, A   Only when the PXM-UI-S3 is used with an PXM1E card. No software dependency.  

Problem Description

PXM1E equipped with PXM-UI-S3 backcard loses up to 20 percent of Ethernet packets when pinged through some brands of hubs.

This problem does not apply to the PXM1 series or PXM45 or PXM45/B equipped with PXM-UI-S3 back cards.

Note: The PXM45/C does not support the PXM-UI-S3.  

Background

This problem is the result of low noise tolerance on the Ethernet interface of the PXM-UI-S3.  

Problem Symptoms

Pings to the MGX8800 equipped with the PXM1E-type cards and the PXM-UI-S3 may not complete 100 percent of the time. Access to the MGX8800 may be interrupted or appear slow. With Cisco products exhibiting the anomaly, use the show port command. The example given is for a Catalyst 2948. Observe the transmit and receive error counters as shown below.

USNY-2948-0.20> (enable) show port 2/3
  Port  Name                Status     Vlan        Level   Duplex  Speed  Type
  ----- ------------------  ---------- ----------  ------  ------  -----  ------------
  2/3                       connected  1           normal  half    10     10/100BaseTX

  Port  Auxiliary     Vlan              AuxVlan-Status  Inline Powered  Power Allocated
  Admin Oper          Detected                                 mWatt    mA    @51V
  ----- ------------- --------------    -----           ------ -------- ----- --------
  2/3   none          none                  -                -        -     -        -

  Port  Security Violation Shutdown-Time Age-Time Max-Addr Trap     IfIndex
  ----- -------- --------- ------------- -------- -------- -------- -------
  2/3   disabled shutdown  0             0        1        disabled 11

  Port  Num-Addr Secure-Src-Addr   Age-Left Last-Src-Addr     Shutdown/Time-Left
  ----- -------- ----------------- -------- ----------------- ------------------
  2/3   0                        -        -                 -        -         -

  Port  Status     Channel              Admin Ch
                   Mode                 Group Id
  ----- ---------- -------------------- ----- -----
  2/3   connected  auto silent             14     0

  Port  Align-Err  FCS-Err    Xmit-Err   Rcv-Err    UnderSize
  ----- ---------- ---------- ---------- ---------- ---------
  2/3            -          0          3          3         0

  Port  Single-Col Multi-Coll Late-Coll  Excess-Col Carri-Sen Runts     Giants
  ----- ---------- ---------- ---------- ---------- --------- --------- ---------
  2/3            0          0          0          0         0         3         0

  Last-Time-Cleared
  --------------------------
  Wed Jan 15 2003, 15:45:55
Products from other vendors may have similar statistics as well.  

Workaround/Solution

Workaround: None.

Solution: Upgrade the PXM-UI-S3 with an PXM-UI-S3/B. Use the upgrade form attached below.  

DDTS

DDTS Description
CSCdx59414(registered customers only) pxm1e ethernet packet loss

Upgrade Program

CSCdx59414 PXM-UI-S3 Ethernet interface can drop packets.

If you have any questions concerning the upgrade program, you can e-mail upgrades-info@cisco.com.

Note: Fields marked with an asterisk (*) are required fields.

Company Information
*Organization
*Address
Address_line2
*City
*State/Province
*ZIP/Postal Code
Country
Product
Product *Quantity
PXM-UI-S3 upgrade to PXM-UI-S3/B
Contact Information
*First Name
*Last Name
*Phone 1 Ext.
Fax 1 Ext.
*Internet E-Mail
Please use the following format: user@domain.com
*Upgrade Order Reference Number
Please provide a number that you can use when inquiring about order status
*Serial Numbers of Affected Units 2
1 For phone and fax, include 011 and the country code outside North America.

2 When entering more than one serial number in the serial number text entry field, be sure to type a comma between each serial number to separate them.

For More Information