March 9, 2007
THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.
All versions of AVS SW
New U.S. Daylight Savings Times rules go into effect in March 2007. Consequently, customers whose network components rely on the default U.S. summertime clock settings within AVS software will be affected by the following problem.
For operating systems that have not been updated with the new U.S. DST policy changes, timestamps will exhibit a one hour time clock offset lasting three weeks beginning at 2:00 A.M. on the second Sunday in March of 2007. They will also exhibit a one hour time clock offset lasting one week beginning at 2:00 A.M. on the first Sunday in November.
Any time-dependent product features of AVS will be affected by this problem unless you move to the appropriate software image or apply the workaround as herein described.
Example of potential concerns:
Kerberos requires that the time between the client and server be within a 5 minute range, otherwise failures will occur. Other authentication devices can also fail when the times are off. Additionally, troubleshooting will be impacted/more difficult because the log times will be off by an hour.
On August 8, 2005, the Energy Policy Act of 2005 (H.R.6.ENR), was signed into law. Section 110 of this Act modified the time change dates for Daylight Saving Time (DST) in the U.S.
Beginning in March of 2007, DST will begin on the second Sunday of March and end the first Sunday of November.
For 2007 and beyond, the daylight saving time period will be:
2:00 A.M. on the second Sunday in March
2:00 A.M. on the first Sunday in November
For more information on the Energy Policy Act of 2005, see H.R. 6. (See Section 110)
For networking systems, the clock or clock source is often derived from a trusted chronological source such as a private or public Atomic clock, often through Network Time Protocol (NTP). NTP communicates time in Coordinated Universal Time (UTC), colloquially known as GMT, and thus is not impacted, nor is a workaround for statutory time zone changes. Local time definitions, including summertime settings are part of the configuration of most Cisco products.
Network Time Protocol (NTP) Implications
Regardless of whether or not network components are configured to use differing clock sources such as UTC and NTP, networks will be affected when clock summer-time commands are enabled with incorrect parameters.
Impact to Networking Systems
Any time-based function may be off by one hour. Log file timestamps will not be accurate, time-based routing systems may not engage/disengage at the desired time, displays may be one hour off, and so on.
All AVS products using 5.0 or previous software versions must upgrade to 5.0.3 to obtain the DST fix. 5.0.3 can be downloaded from cisco.com at the AVS3110 5.0.3 Software Download (registered customers only) page.
Upgrade instructions are outlined in the AVS 3120 Release Note for the Cisco Application Velocity System (Software Version 5.0.x).
No DST fix will be made available for AVS 6.0 software. AVS 6.0 customers have the following options:
Downgrade to the 5.0.3 software version to obtain a fix (procedure below)
Complete manual workaround. CLI is available to manually set the time. The command (set date ) is documented as part of user guide in the Command Line Interface section.
AVS 3120 Downgrade Procedure
The following instructions should be followed to downgrade AVS 3120 running 6.0 software to 5.0 software. The user has to follow two steps to pickup latest 5.0.3 image. In the first step, AVS 3120 will be downgraded to the AVS 5.0 image. In second step, the user must follow the standard AVS 3120 upgrade procedure to upgrade the system from the 5.0 release to the 5.0.3 release.
Assumption for following instructions:
IP address of the AVS 3120: 172.23.63.98
Gateway : 172.23.63.65
TFTP server ip address : 172.23.61.72
AVS 5.0 tftp image location at TFTP server: /tftpboot/images/AVS-K9-5.0.0-20-tftp.img
AVS 5.0.3 upgrade image location at ftp server: /tftpboot/images/ AVS-K9-UPGRADE-5.0.3-8-tftp.tar.gz
Section-1: Steps to save configuration in AVS 3120 and AVS3180
Step-1: Login into AVS 3120/AVS-3180 as root
Step-2: Create archive of all files under /usr/avs-data/avs-apps and 'scp' them into a server (cd /usr/avs-data/avs-apps; tar cf /var/log/conf_backup.tar; scp /var/log/conf_backup.tar:
Go on to Section-2: Perform Downgrade
Section-2: Downgrading AVS 3120 to AVS 5.0 release:
Step 1: Connect your AVS-3120 box on the network.
Step 2: Place the tftp image file on a local tftp server.
Step 3: Boot the box, as soon as you see Use BREAK or ESC to interrupt boot. Use SPACE to begin boot immediately., hit the Esc key to get into rommon mode.
Step 4: Issue commands like the following:
rommon #3> address 172.23.63.98
rommon #4> gateway 172.23.63.65
rommon #5> server 172.23.61.72
rommon #6> file /tftpboot/images/AVS-K9-5.0.2-13-tftp.img
rommon #7> tftpdnld
ROMMON Variable Settings:
tftp /tftpboot/images/AVS-K9firstname.lastname@example.org via 172.23.63.65
Then you will see continuing "!" for 8 minutes. This is an output symbol during the TFTP process for our 140MB TFTP image. Then the image will boot and launch the AVS image creation process, another 4 minute process. You will see something like this:
kjournald starting. Commit interval 5 seconds
EXT3-fs warning: checktime reached, running e2fsck is recommended
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,2), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Image Creation Task Complete !
The system is going down NOW !!
Sending SIGTERM to all processes.
Sending SIGKILL to all processes.
Please stand by while rebooting the system.
flushing ide devices: hda
Booting system, please wait...
Cisco Systems ROMMON Version (1.0(11)0) #0: Mon Sep 26 15:36:26 PDT 2005
Use BREAK or ESC to interrupt boot.
Use SPACE to begin boot immediately.
Boot configuration file contains 2 entries.
GNU GRUB version 1.0(11)0 (631K lower / 4062208K upper memory)
0: Cisco AVS Runtime Image
1: Cisco AVS Maintenance Image
Starting fgndrivers: i2c-core.o: i2c core module
i2c-dev.o: i2c /dev entries driver module
i2c-core.o: driver i2c-dev dummy driver registered.
i2c-dev.o: Registered 'SMBus I801 adapter at dc00' as minor 0
i2c-core.o: adapter SMBus I801 adapter at dc00 registered as adapter 0.
[ OK ]
Starting fgncleanup: [ OK ]
Starting fgnpn: [ OK ]
Starting fgndb: [ OK ]
Starting fgnmc: [ OK ]
At this point, downgrading of AVS 3120 to 5.0 software is complete.
Section-3: Upgrading AVS 3120 from release 5.0 to release 5.0.3:
Please follow the instructions outlined in the AVS 3120 Release Note for the Cisco Application Velocity System (Software Version 5.0.x).
Section-4: Restoring Configuration
Step-1: Login into AVS3120/AVS-3180 as fgn
Step-2: Configure network connection
Step-3: Login into AVS3120/AVS-3180 as root
Step-4: scp archive (that was created in step-2) into /var/log directory
Step-5: Extract the archived files under /usr/avs-data/avs-apps
Step-6: Reboot the box
To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.
CSCsh58527 (registered customers only)
Apply the DST timezone patch to the AVS Platforms
Initial Public Release
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:
Receive Email Notification For New Field Notices
Product Alert Tool - Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.