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Cisco 7500 Series Routers

Field Notice: Cisco 75xx: POSIP Upgrades


December 29, 1997


Products Affected

This field notice affects the following products:

  • POSIP-OC3-20-MM

  • POSIP-OC3-20-SM

  • POSIP-OC3-40-MM

  • POSIP-OC3-40-SM

Problem Description

On 10/22/97 Cisco Systems notified the field of an issue that was shown to exist with RFC1619 (PPP Over SONET/SDH) compliant products.

Under a set of very unique and specific traffic conditions, consecutive identical digits (CID) have been shown to contribute to SONET tributary interface errors. The problem arises because the standard implementation of PPP over SONET/SDH does not require scrambling which can be used to ensure that signal characteristics meet SONET receiver specifications under all packet and bit combinations.

Cisco Systems has evaluated this issue and, together with others in the industry, have shown that the ATM forum scrambling solution can also be applied to RFC1619 compliant products to maintain synchronization.

Because this can represent a critical issue for operational networks, Cisco strongly recommends that POSIP interfaces be upgraded. This upgrade is available at no cost to all POSIP users.

Expiration: This upgrade program expires April 25, 1998. All upgrade registrations must take place on or before this date to receive the free upgrade.

Problem Symptoms

Under a set of very unique and specific traffic conditions, consecutive identical digits (CID) have been shown to contribute to SONET tributary interface errors.

View bug details for CSCdj53902 (registered customers only) .

Workaround/Solution

Hardware and software changes have been made to the POSIP card which correct the condition described above. Cisco strongly recommends that customers upgrade all POSIP cards.

The Cisco IOS commands show diag and show ver can be used to identify POSIP cards installed in a chassis and the system software level. Revised POSIP cards can be identified by using the following tables:

Table 1: Product Number to Part Number Conversion

Product Number

VIP2 Motherboard Part Number

POS Port Adapter Part Number

POSIP-OC3-20-MM

73-1684-XX

73-1803-XX

POSIP-OC3-20-SM

73-1684-XX

73-2107-XX

POSIP-OC3-40-MM

73-1684-XX

73-1803-XX

POSIP-OC3-40-SM

73-1684-XX

73-2107-XX

Table 2: Part Number to Version and Revision

Part Number

Old HW Version & Earlier

Old Revision & Lower

New HW Version & Later

New Revision & Later

Note

73-XXXX-05

1.4

A0

1.5

BO

Original Fab

73-XXXX-06

1.21

A0

1.30

A0

Reworked to 73-XXXX-07 by changing EPLDs

73-XXXX-07

NA

NA

1.30

A0

Same Fab as -06, but with new EPLDs

Because the POSIP-20-XX products are no longer orderable, the following matrix applies to all orders:

If you have the following product number:

And one of the following Hardware Revision & Version Levels

You will receive the following product number:

And one of the following Hardware Revision & Version Levels

POSIP-OC3-20-MM

HW rev 1.4, Revision A0 or lower

POSIP-OC3-40-MM

HW rev 1.5, Revision B0 or higher

HW rev 1.6, Revision A0 or higher

HW rev 1.7, Revision A0 or higher

POSIP-OC3-20-SM

HW rev 1.4, Revision A0 or lower

POSIP-OC3-40-SM

HW rev 1.5, Revision B0 or higher

HW rev 1.6, Revision A0 or higher

HW rev 1.7, Revision A0 or higher

POSIP-OC3-40-MM

HW rev 1.4, Revision A0 or lower

POSIP-OC3-40-MM

HW rev 1.5, Revision B0 or higher

HW rev 1.6, Revision A0 or higher

HW rev 1.7, Revision A0 or higher

POSIP-OC3-40-SM

HW rev 1.4, Revision A0 or lower

POSIP-OC3-40-SM

HW rev 1.5, Revision B0 or higher

HW rev 1.6, Revision A0 or higher

HW rev 1.7, Revision A0 or higher

Note:?POSIPs that are hardware version 1.5 or later do not support CRC32. POSIPs that are hardware version 1.5 or later will only support CRC16 and can be configured take advantage of the scrambling feature following the example below.

The Packet OC-3 interface is referred to as pos in the configuration commands. An interface is created for each POSIP found in the system at reset time. Before you can alter the interface configuration, you must select a specific Packet OC-3 interface using the interface pos slot/port-adapter/port command as follows:

Router(config)# interface pos x/y/z

where x is the slot number and differs by the Cisco router in which the POSIP is installed, y is the port adapter slot (always 0), and z is the interface (always 0). To set the scrambling feature, use the command as follows:

Router# configure terminal  
Enter configuration commands, one per line. End with CNTL/Z.  

Router(config)# interface pos 3/0/0 
Router(config-if)# pos scramble-atm

Use the show running-config command to display the currently running POSIP configuration in RAM and verify that scrambling has been enabled, as follows:

Router# sh running-config 
<text omitted> 
! 
interface pos0/0/0 
ip address 1.1.1.3 255.255.255.0 
no ip route-cache distributed 
no keepalive 
pos report SLOS 
pos report SLOF 
pos report PLOP 
pos scramble-atm 
! 
<text omitted>

Return & Repair Upgrade Program

Beginning January 1, 1998, customers may request upgraded POSIP cards on a port-for-port basis at no charge through an return and repair program.

You are eligible to have each POSIP upgraded for each POSIP purchased on your original sales order(s). If you purchased your equipment from a reseller or distributor, contact the reseller or distributor, who will arrange for the replacement hardware. If you purchased your equipment directly from Cisco Systems, fill out the following information and click the SendForm button at the end of the page. PLEASE FILL OUT A SEPARATE FORM FOR EACH ORIGINAL SALES ORDER.

Once you have submitted the form, an RMA number and shipping instructions will be issued once Cisco acknowledges the purchase order. Customers are responsible for properly labeling and packaging upgrades and prepay shipping to Cisco.

All upgraded POSIPs will be shipped back to customers prepaid via ground carrier. Any other means of shipment requested will be sent collect. POSIPs sent in for Repair and Return will be upgraded and shipped out to the customers within ten (10) working days after receipt of down rev equipment.

If you have any technical questions regarding the replacement program, please contact Cisco Systems Technical Assistance Center (TAC) at (800) 553-24HR, (408) 526-7209, or send e-mail to tac@cisco.com.

Customers who purchased POSIP cards from a reseller or distributor should contact the reseller or distributor directly to arrange for replacements.

Customers who purchased POSIP cards directly from Cisco, can fill out the on-line Upgrade Form to arrange upgrading POSIP(s). If you have any questions concerning the the upgrade program, you can email the Logistics Support Center at lsc-help@cisco.com, or fax it to (408) 527-6633, Attn: Logistics Support Center.

Note:?Please fill out a separate form for each original sales order.

Identifying Hardware Levels

You can identify the hardware version of your POSIP by using the Cisco IOS command show diag. Indentifying POSIP hardware versions:

Router# sh diag 2
Slot 2:
Physical slot 2, ~physical slot 0xD, logical slot 2, CBus 0
Microcode Status 0x4
Master Enable, LED, WCS Loaded
Board is analyzed
Pending I/O Status: None
EEPROM format version 1
VIP2 controller, HW rev 2.4, board revision B0
Serial number: 03514213  Part number: 73-1684-03
Test history: 0x00        RMA number: 00-00-00
Flags: cisco 7000 board; 7500 compatible

        EEPROM contents (hex):
          0x20: 01 15 02 03 00 35 9F 65 49 06 94 03 00 00 00 00
          0x30: 06 3C 00 2A 1A 00 00 00 00 00 00 00 00 00 00 00

        Slot database information:
        Flags: 0x4      Insertion time: 0x1294 (00:13:39 ago)

        Controller Memory Size: 32 MBytes DRAM, 1024 KBytes SRAM
 
        PA Bay 0 Information:
                POS PA, 1 port
                EEPROM format version 1
                HW rev 1.5, Board revision A0
                ^^^^^^^^^^^^^^^^^^
                New Hardware Revision

        Serial number: 00000032 Part number: 73-1803-07
                                ^^^^^^^^^^^^^^^^^^^^^^^
                                New Part Version 

Physical Replacement of Parts

On the Cisco 7500 series, the POSIP cards are hot-swappable and can be replaced with a replacement POSIP without turning off the system. For more information on how to replace a POSIP, please read "Packet OC-3 Interface Processor (POSIP)".

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:

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