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%IPFAST-2-PAKSTICK: Corrupted pak header for BVI1

I have recently upgraded a 1760 router with release 12.3(7)T12. Since the upgrade the router displays errors on the console.

Nov 11 12:04:02.371: %IPFAST-2-PAKSTICK: Corrupted pak header for BVI1, flags 0x8A

-Traceback= 800C5078 80B0F0AC 80B104F0 802BAF8C 802C1330 8021FC1C 802B1A3C 802B1A3C 8021FCDC 803D2B60 803D2B60 803DF474 8014474C 8013FFE8 80224728 80227F30

Nov 11 12:05:06.368: %IPFAST-2-PAKSTICK: Corrupted pak header for BVI1, flags 0x8A

-Traceback= 800C5078 80B0F0AC 80B104F0 802BAF8C 802C1330 8021FC1C 802B1A3C 802B1A3C 8021FCDC 8013FFDC 8013FFD4 80224728 80227F30

When I turn fast switching off, the messages dissapear.

Has anyone faced simular problems?

Router#sh ver

Cisco IOS Software, C1700 Software (C1700-K9O3SY7-M), Version 12.3(7)T12, RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Fri 12-Aug-05 13:41 by alnguyen

ROM: System Bootstrap, Version 12.2(7r)XM2, RELEASE SOFTWARE (fc1)

Router uptime is 1 week, 19 hours, 37 minutes

System returned to ROM by reload

System restarted at 17:28:55 cet Fri Nov 11 2005

System image file is "flash:c1700-k9o3sy7-mz.123-7.T12.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 1760 (MPC860P) processor (revision 0x500) with 59132K/6404K bytes of memory.

Processor board ID FOC073501P1 (2719306673), with hardware revision 0000

MPC860P processor: part number 5, mask 2

1 FastEthernet interface

1 ATM interface

1 Virtual Private Network (VPN) Module

32K bytes of NVRAM.

32768K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102


VIP Purple

Re: %IPFAST-2-PAKSTICK: Corrupted pak header for BVI1


the only software bug I could find is the following:

A Cisco router that is running fast switching (not Cisco express forwarding)

and software crypto might display the following message:

%IPFAST-2-PAKSTICK: Corrupted pak header for FastEthernet0/ 1, flags 0x80

-Traceback= 6026398C 60EA7DE4 60E83840 60E82C04 6035E464 6035E450

%IPFAST-2-PAKSTICK: Corrupted pak header for FastEthernet0/ 1, flags 0x80.

There is no workaround.

This one is actually for older (12.0) IOS versions. You might want to check if you have fast-switching (ip route-cache) configured on your router.

Also, can you post your configuration ?




Re: %IPFAST-2-PAKSTICK: Corrupted pak header for BVI1

From my initial posting you could have read that I turned fast switching off.

The router has CEF enabled globally but the "no ip route-cache" switches both fast and cef switching off. However this solves the problem, but is merely a workaround. I will try a newer software image if available and see what happens.