Field Notice: *Expired* FN - 12940 - Early Version of PA-A3-xxx Cards Exhibit ATM Performance Limitations

Revised November 21, 2006

October 5, 2000

NOTICE:

THIS FIELD NOTICE HAS BEEN ARCHIVED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE, WARRANTY OR SUPPORT. USE OF THE INFORMATION ON THIS FIELD NOTICE OR MATERIALS LINKED FROM THIS FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

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Products Affected

Product	Top Assembly		Printed Circuit Assembly		Comments	HW Rev.
	Part Number	Rev.	Part Number	Rev.
PA-A3-E3	800-02602-03	-B0	73-2434-03	-B0	^ASY,ELMECH,PA-ATM-DELUXE-E3	N/A
PA-A3-OC3MM	800-02598-03	-A0	73-2430-03	-A0	^ASY,ELMECH,PA-ATM-DELUXE-OC3-MM	N/A
PA-A3-OC3SMI	800-02595-03	-A0	73-2427-03	-A0	^ASY,ELMECH,PA-ATM-DELUXE-OC3-SMI	N/A
PA-A3-OC3SML	800-02596-03	-A0	73-2428-03	-A0	^ASY,ELMECH,PA-ATM-DELUXE-OC3-SML	N/A
PA-A3-T3	800-02600-03	-B0	73-2432-03	-A0	^ASY,ELMECH,PA-ATM-DELUXE-DS3	N/A

Problem Description

Early versions of the PA-A3-xxx cards used hardware revision 1.0 of the Segmentation and Reassembly (SAR) component. The 1.0 SAR component has ATM performance limitations which, under high traffic conditions, may result in dropped packets and reports of cyclic redundancy check (CRC) errors.

Routers with high utilization will exhibit incrementing "rx_no_buffer" counts when the show controller command is issued.

Background

A limited quantity of PA-A3-xxx cards were produced prior to the implementation of hardware revision 2.0 of the SAR component. The 2.0 SAR component resolves the performance limitations of the 1.0 SAR component.

Problem Symptoms

The sample output below shows the drops when the PA-A3 card with a 1.0 SAR component reaches the performance limitations. The drops are counted as "rx_cell_throttle" in the output of the show controller command on the VIP console. This output was taken using Cisco IOS® Software release 12.0(6)S.

Interface ATM1/0 is up
Hardware is ENHANCED ATM PA - SONET OC3 (155Mbps)
Lane client mac address is 0050.506e.e088
Framer is PMC PM5346 S/UNI-155-LITE, SAR is LSI ATMIZER II
Firmware rev: C114, Framer rev: 0, ATMIZER II rev: 2
idb=0x60700A80, ds=0x60705EC0, vc=0x60739860
slot 1, unit 1, subunit 0, fci_type 0x0067, ticks 364170
2048 rx buffers: size=512, encap=64, trailer=28, magic=4
Curr Stats:
rx_cell_lost=0, rx_no_buffer=2375303, rx_crc_10=0
rx_cell_len=0, rx_no_vcd=15, rx_cell_throttle=302564, tx_aci_err=0
Rx Free Ring status:
base=0x5A65C080, size=2048, write=232
Rx Compl Ring status:
base=0x38152F80, size=4096, read=2191
Tx Ring status:
base=0x53813380, size=8192, write=120
Tx Compl Ring status:
base=0x3015AFC0, size=4096, read=47
BFD Cache status:
base=0x60733820, size=6144, read=6117
Rx Cache status:
base=0x6072A740, size=16, write=6
Tx Shadow status:
base=0x6072B7E0, size=8192, read=111, write=120
Control data:
rx_max_spins=67, max_tx_count=126, tx_count=9
rx_threshold=1366, rx_count=8, tx_threshold=4608
tx bfd write indx=0x109, rx_pool_info=0x6072A7A0
Control data base address:
rx_buf_base = 0x30022CE0 rx_p_base = 0x607065C0
rx_pak = 0x606E0A60 cmd = 0x60706380
framer = 0x60198260 framer_cb = 0x60706400
framer_base = 0x52400000 pci_pa_stats = 0x3815F000
device_base[0] = 0x52000000 device_base[1] = 0x53000000
ssram_base[0] = 0x52600000 ssram_base[1] = 0x53600000
sdram_base[0] = 0x52800000 sdram_base[1] = 0x53800000
pa_cmd_buf[0] = 0x5267FC00 pa_cmd_buf[1] = 0x5367FC00
vcd_base[0] = 0x52600000 vcd_base[1] = 0x53618000
chip_dump[0] = 0x3015F024 chip_dump[1] = 0x3015F114
sar_buf_base[0] = 0x52800000 sar_buf_base[1] = 0x5381C000
bfd_base[0] = 0x5264A000 bfd_base[1] = 0x53600000
acd_base[0] = 0x52620080 acd_base[1] = 0x53638240

Workaround/Solution

Whenever the specific ATM performance limitations are seen on early PA-A3-xxx cards with the 1.0 SAR component, replace the card with a PA-A3-xxx that uses the 2.0 SAR component by requesting a return materials authorization (RMA) from the Technical Assistance Cetner.

DDTS

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

DDTS	Description
CSCdp43275 (registered customers only)	Packet drops on PA-A3-OC3 Rev. 1.0

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:

• Open a service request on Cisco.com
• By email
• By telephone

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