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Cisco AVS 3100 Series Application Velocity System

Field Notice: FN - 62740 - U.S. Daylight Savings Time Policy Changes Effective March 2007 - For AVS Products


March 9, 2007

NOTICE:

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.


Products Affected

Products Affected

Comments

AVS

All versions of AVS SW

AVS-K9

AVS-3120-K9

AVS-MANAGEMENT

AVS-3180-MGMT-K9, AVS-3180A-MGMT-K9

Problem Description

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.

Background

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

to

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.

Problem Symptoms

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.

Workaround/Solution

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:

  1. Downgrade to the 5.0.3 software version to obtain a fix (procedure below)

  2. 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

Summary:

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:

/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: 
ADDRESS=172.23.63.98 
SERVER=172.23.61.72 
GATEWAY=172.23.63.65 
PORT=GigabitEthernet0/3 
VLAN=untagged 
IMAGE=/tftpboot/images/AVS-K9-5.0.2-13-tftp.img 
CONFIG= 
LINKTIMEOUT=20 
PKTTIMEOUT=4 
RETRY=20 

tftp /tftpboot/images/AVS-K9-5.0.2-13-tftp.img@172.23.61.72 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 
Restarting system. 


Booting system, please wait... 

... 
Cisco Systems ROMMON Version (1.0(11)0) #0: Mon Sep 26 15:36:26 PDT 2005 

Platform AVS-3120-K9 

Use BREAK or ESC to interrupt boot. 
Use SPACE to begin boot immediately. 

Launching BootLoader... 
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 ] 

AVS-3120-K9 
velocity login:

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

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

CSCsh58527 (registered customers only)

Apply the DST timezone patch to the AVS Platforms

Revision History

Revision

Date

Comment

1.0

09-MAR-2007

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:

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