Cisco 10000 Installation Manual

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Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

This document describes how to upgrade a Cisco 10000 series router to Cisco IOS Release 12.2(28)SB on an ESR-PRE2 processor. Four different procedures are available; the choice of which to use depends on the specific system configuration you start from.

Upgrading a system that currently uses an ESR-PRE1 requires a hardware upgrade to an ESR-PRE2. For hardware installation instructions, see the Cisco 10000 Router Performance Routing Engine Installation at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/aggr/10000/hdwr/3971pr.htm

Technical Support

The Cisco Technical Support Website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Support is available 24 hours a day, 365 days a year, at this URL:

http://www.cisco.com/techsupport

This web page has a link for email or phone technical support.

Note All the procedures in this document are service-affecting. These procedures can require a hardware

replacement, forced switchover of the active PRE, or software reload. At some point during each process, the router will not be available for user traffic.

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Upgrade Paths and Compatibility

Table 1 shows the upgrade procedure options matched to the starting ESR-PRE version and Cisco IOS

release. Use the information in Tabl e 1 to determine which upgrade procedure to use.

Table 1 Upgrade Procedures Matched to ESR-PRE Version and IOS Release

Current Processor Cisco IOS Release Use Procedure...

ESR-PRE1 12.0(22)S

12.0(23)S

12.0(24)S

12.0(25)S

12.0(26)S

12.0(27)S3 or earlier

12.0(28)S1 or earlier

12.0(30)S2 or earlier

12.0(25)SX8 or earlier

ESR-PRE2 12.2(16)BX or earlier

12.3(7)XI1 or earlier

ESR-PRE1 12.0(30)S3 or later

12.0(27)S4 or later

12.0(28)S2 or later

12.0(25)SX9 or later

ESR-PRE2 12.3(7)XI2 or later Upgrade Option 4: ESR-PRE2 Upgrade with

Upgrade Option 1: ESR-PRE1 Upgrade with Cold Start, page 2

Upgrade Option 2: ESR-PRE2 Upgrade with Cold Start, page 4

Upgrade Option 3: ESR-PRE1 Upgrade with RPR Switchover, page 5

RPR Switchover, page 8

Caution In general, configurations for earlier releases are compatible with release 12.2(28)SB. However, some

configuration commands from release 12.2(28)SB may not be understood by earlier releases. It is always advisable to test the old configuration with the new image before installing the new image on the production network.

Upgrade Option 1: ESR-PRE1 Upgrade with Cold Start

This procedure assumes the following configuration:

• Cisco 10000 series chassis with two installed ESR-PRE1 processors.

• A non-upgrade-enabled image such as 12.0(25)SX6 or 12.0(27)S2 on the ESR-PRE1s; see Tabl e 1

for a list of affected images.

You need two ESR-PRE2s to replace the ESR-PRE1s.

Note This upgrade procedure requires a dual ESR-PRE hardware replacement. The hardware replacement

requires a cold reboot and therefore is a service-affecting hardware upgrade. The router will not be available for user traffic starting with Step 3 of the upgrade, and traffic cannot resume until the upgrade is complete.

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Upgrade Option 1: ESR-PRE1 Upgrade with Cold Start

To perform the upgrade, follow these steps:

Step 1 On the active ESR-PRE1, issue the write memory command to make sure the startup configuration is

up to date.

Step 2 Copy the saved startup configuration to a TFTP server and edit the configuration to reflect the new

capabilities of the 12.2(28)SB software. At a minimum, you must edit the boot system variable to point to the new image, using the boot system bootflash:image_name command and specifying your chosen image name.

Step 3 Remove both ESR-PRE1s, and install one ESR-PRE2 in one open slot. Make sure you have direct

console access to the ESR-PRE2.

Step 4 The boot image should load itself from bootflash (the expected behavior). If the ESR-PRE2 comes up in

ROM monitor, type boot to load the boot image.

Step 5 Configure the network management interface (typically FastEthernet 0/0/0) and the gateway IP address

the same as they were on the removed ESR-PRE1s to enable communications with the TFTP server.

Step 6 Copy the edited startup configuration from the TFTP server to your startup configuration using the copy

tftp startup command.

Step 7 Copy the 12.2(28)SB image from the TFTP server to bootflash, being sure to use the same name for the

image that you specified in Step 2 for the boot system variable in the startup configuration.

Step 8 Enter the reload command and type no when asked if you want to save your running configuration.

If the ESR-PRE2 config-register is set to 0x2, this command will autoboot the new image.

If the ESR-PRE2 config-register is set to 0x0, it will come up in ROM monitor. Boot the new image from ROM monitor using the boot bootflash:image_name command.

Step 9 After the ESR-PRE2 is up and running the new image, verify that the Cisco IOS version, configuration,

boot variable, and traffic are as expected.

Step 10 Shut down the FastEthernet 0/0/0 interface on the first ESR-PRE2 using the shut command. Then insert

the second ESR-PRE2 and repeat Step 4 through Step 8 for the second ESR-PRE2. After the second ESR-PRE2 has booted, use the no shut command on the active ESR-PRE2 to activate the FastEthernet 0/0/0 interface again.

Now the system should be operating as a dual-PRE redundant 12.2(28)SB system in the configured mode (either SSO or RPR+), running the properly modified startup configuration. You can verify the redundancy status using the show redundancy or show redundancy state command.

Step 11 Enter the write memory command from the active console to bring the startup configuration up to date

on the active and standby ESR-PRE2s.

Rollback Procedure for Option 1

To roll back to the ESR-PRE1 configuration:

Step 1 Remove both ESR-PRE2s and reinstall the ESR-PRE1s.

The ESR- PRE1s should operate as they did in the original setup.

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Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

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Upgrade Option 2: ESR-PRE2 Upgrade with Cold Start

This procedure assumes the following configuration:

• Cisco 10000 series chassis with two installed ESR-PRE2 processors

• A non-upgrade-enabled image such as 12.2(16)BX or earlier 12.3(7)XI1 or earlier on the PRE2s

Note The router will not be available for user traffic during Step 7 of the software upgrade, and traffic cannot

resume until the upgrade is complete.

To perform the upgrade, follow these steps:

Step 1 Load the appropriate 12.2(28)SB image from the TFTP server into bootflash on both ESR-PRE2s.

Step 2 If the startup configuration is not up to date, save the running configuration using the write-memory

command.

Step 3 Copy the startup configuration from the active ESR-PRE2 to a disk or TFTP server to save it for possible

rollback.

Step 4 At the console, use the boot system bootflash:image_name command to edit your boot system variable

to point to the 12.2(28)SB image in bootflash. Save the running configuration using the write memory command.

Use the show bootvar command to verify that the boot system variable has been altered appropriately on both the active and standby ESR-PRE2s.

If you do not want to make further changes to the startup configuration for the new command set offered by release 12.2(28)SB, skip to Step 7.

Note In some older releases, the configuration does not explicitly specify the redundancy mode. If your

current configuration is one of these, and you want RPR+ operation with release 12.2(28)SB, you must add the line mode rpr-plus after the line that specifies redundancy in the configuration on the TFTP server. Release 12.2(28)SB defaults to SSO mode unless it is explicitly configured for RPR+.

Step 5 Your startup configuration now reflects the altered boot system image. Copy it to the TFTP server and

make any other needed edits. Then copy the altered configuration from the server to the startup configuration on the active and standby ESR-PRE2s using the copy tftp startup and copy tftp stby-nvram:startup-config commands. Verify that the startup configuration has been copied to both the active and the standby NVRAM using the dir command and comparing file size.

Step 6 Verify again that the boot image and config-register are set appropriately using the show bootvar

command.

Step 7 On the active ESR-PRE2, enter the reload command and type no if you are asked to save the running

configuration.

• If the system is configured for autoboot, it will autoboot the new 12.2(28)SB image on both

ESR-PRE2s.

• If the system is not configured for autoboot, both ESR-PRE2s will come up in ROM monitor after

reloading. Boot the 12.2(28)SB image in bootflash from the ROM monitor prompt on each ESR-PRE2.

Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

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At this point, the system should be operating as a dual-PRE redundant 12.2(28)SB system in the configured mode (either SSO or RPR+), running the properly modified startup configuration. You can verify the redundancy status using the show redundancy or show redundancy state command.

Step 8 Enter the write memory command from the active console to bring the startup configuration up to date

on the active and standby ESR-PRE2s.

Rollback Procedure for Option 2

To roll back to the original release:

Step 1 Copy the original startup configuration from the TFTP server to the startup configuration on the active

and standby ESR-PRE2s using the copy tftp startup and copy tftp stby-nvram:startup-config commands. (This is the configuration file you copied in Step 3 of the upgrade procedure.)

Step 2 Use the show bootvar command to verify that the boot system variable now points to the old image and

the config-register is set appropriately.

Step 3 Reload the active ESR-PRE2 using the reload command.

• If autoboot is set, the system should come up in the configured redundant mode (for older releases

that support redundancy).

Upgrade Option 3: ESR-PRE1 Upgrade with RPR Switchover

• If autoboot is not set, the system will come up to ROM monitor. From the ROM monitor prompt,

boot the proper image from the bootflash on each ESR-PRE2.

You have now reverted to the original system configuration.

Upgrade Option 3: ESR-PRE1 Upgrade with RPR Switchover

This procedure assumes the following configuration:

• Cisco 10000 chassis with two installed ESR-PRE1 processors

• An upgrade-enabled image such as 12.0(25)SX9 (or later) or 12.0(27)S4 (or later) on the

ESR-PRE1s; see Table 1 for a list of affected images.

You need two ESR-PRE2s with boot image installed in the bootflash to replace the ESR-PRE1s.

Note This upgrade procedure is service affecting. It requires a sequential PRE hardware replacement and a

switchover from the active to standby PRE. During the switchover in Step 10, the router will not be available for user traffic.

Note At several steps during this procedure, two PREs will alternately be using their FastEthernet0/0/0 NME

ports to copy files to and retrieve files from your TFTP server. Be certain that the FastEthernet0/0/0 port that is not in current use is shut down (using the shut command) and that the one in use is active (using the no shut command). Otherwise, collisions are likely if both ports are using the same IP address.

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Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

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Upgrade Option 3: ESR-PRE1 Upgrade with RPR Switchover

To perform the upgrade, follow these steps:

Step 1 On the active ESR-PRE1, issue the write memory command to make sure the startup configuration is

up to date. Save the startup configuration to a TFTP server in case you need to roll back to the previous version.

Step 2 Remove the standby ESR-PRE1 and insert an ESR-PRE2 into the empty slot.

If the config register on the new ESR-PRE2 is set to 0x2, it will autoboot the eboot image bootflash. Type no at the ---System Configuration Dialog--- prompt.

If the config register on the new ESR-PRE2 is set to 0x0, it will come up in ROM monitor. Boot the eboot image from ROM monitor using the boot command. Type no at the ---System Configuration Dialog--- prompt.

Step 3 Access the ESR-PRE2 through the console port and configure the FastEthernet 0/0/0 interface and

gateway IP address the same as they were on the ESR-PRE1 to enable communication with the TFTP server. Make sure the ESR-PRE2 can ping the TFTP server.

Step 4 From the ESR-PRE2 console, copy the 12.2(28)SB image from the TFTP server to the bootflash using

the copy tftp bootflash:image_name command.

Step 5 From the newly installed ESR-PRE2 console, use the dir bootflash command to verify that the

12.2(28)SB image is in the bootflash. Configure the ESR-PRE2 to autoboot using the boot system bootflash:image_name and config-register 0x2 commands. Save the configuration using the write memory command.

Step 6 Copy the ESR-PRE1 startup configuration to the TFTP server and edit the configuration to reflect the

new capabilities of the 12.2(28)SB software. At a minimum, you must configure the ESR-PRE2 to autoboot using the boot system bootflash:image_name (as in Step 5).

Step 7 Copy the edited startup configuration to the ESR-PRE2 using the copy tftp startup command. Your

startup configuration and boot variable should now be correct. Verify the boot variable using the show bootvar command.

Step 8 From the ESR-PRE2 console, use the reload command to boot the new ESR-PRE2 image. Wait until the

ESR-PRE2 comes up as standby. At this point the ESR-PRE2 is in cold standby RPR state, and the console is disabled. The console displays the message

disabled

Step 9 From the active ESR-PRE1 console, verify that the ESR-PRE1 can communicate with ESR-PRE2 using

Standby operating in RPR mode, console

the following two commands:

dir stby-bootflash (to verify that the correct image name is present)

show redundancy

The show redundancy command output should include the following information:

• Operating Redundancy Mode: RPR

• State of standby ESR-PRE2: Standby Cold

The command output will also include the message

Communications = Down Reason: Failure. You

can ignore this message; it indicates that some of the inter-PRE communications are disabled to prevent incompatibilities.

Step 10 From the ESR-PRE1 console in privileged EXEC mode, enter the redundancy force-switchover

main-cpu command. Wait for the ESR-PRE2 to complete its boot sequence, including processing the

startup configurations it has been set to use. The ESR-PRE2 will become the active PRE.

Step 11 As the ESR-PRE2 becomes active, all traffic should resume shortly. Verify that the state of the

ESR-PRE1 is one of the following:

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Upgrade Option 3: ESR-PRE1 Upgrade with RPR Switchover

• If the ESR-PRE1 config-register is set to 0x0, it will boot to ROM monitor. Boot the ESR-PRE1

image from ROM monitor and wait for to come up as standby in RPR mode with the console disabled.

• If the ESR-PRE1 config-register is set to 0x2 and the autoboot string is set to boot the ESR-PRE1

image, it will come up as standby in RPR mode with the console disabled.

Note From the ESR-PRE1 console and the ESR-PRE2 console, you may see error messages such as Failed

to assert Cutover alarm RP A/or B

because they do not affect operation of the system.

Note Now you should test the 12.2SBB image to determine whether or not a rollback to the previous image is

needed. To roll back, see the “Rollback Procedure for Option 3” section on page 7.

Step 12 After you have verified correct operation of the ESR-PRE2, replace the standby ESR-PRE1 with a

second ESR-PRE2. Bring it up and load the new image onto bootflash as follows:

a. From the newly installed ESR-PRE2 boot image console, copy the 12.2(28)SB image from the TFTP

server to the bootflash using the copy tftp bootflash:image_name command.

b. From the newly installed ESR-PRE2 console, use the dir bootflash command to verify that the

12.2(28)SB image is in the bootflash. Configure the ESR-PRE2 to autoboot using the boot system bootflash:mage-name and config-register 0x2 configuration commands. Save the configuration using the write memory command.

Step 13 Reload the second ESR-PRE2. It will autoboot the new image from the bootflash and come up as the

standby. The console will display the following messages:

PRE2> Standby console disabled PRE2> Standby console disabled

or outgoing IPC bypass failed. You can ignore these messages.

Step 14 Enter the write memory command from the active console to bring the startup configuration up to date

on the active and standby ESR-PRE2s.

Rollback Procedure for Option 3

If the active ESR-PRE2 does not operate satisfactorily after Step 11, you can initiate a second switchover to revert to the original ESR-PRE1 operating as the active processor. You must do so before you perform

Step 12.

To change back to the ESR-PRE1:

Step 1 Make sure the ESR-PRE1 is up as the standby PRE (see Step 11).

Step 2 Remove the active ESR-PRE2 from the chassis. Service will be disrupted as the standby ESR-PRE1

becomes the active standalone.

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Upgrade Option 4: ESR-PRE2 Upgrade with RPR Switchover

Step 3 Insert the second ESR-PRE1 into the empty slot. If it is not configured for autoboot, boot the correct

image from the ROM monitor prompt. The second ESR-PRE1 will come up as the standby in the configured mode.

You have now reverted to a dual-ESR-PRE1 redundant system.

Upgrade Option 4: ESR-PRE2 Upgrade with RPR Switchover

This procedure assumes the following configuration:

• Cisco 10000 series chassis with two installed ESR-PRE2 processors

• active and standby ESR-PRE2s set for autoboot

• Release 12.3(7)XI2 or later

Note This upgrade procedure is service affecting. It requires an RPR switchover from the active to the standby

PRE. During the switchover in Step 8, the router will not be available for user traffic.

To perform the upgrade, follow these steps:

Step 1 Load the appropriate 12.2(28)SB image from the TFTP server into bootflash on both ESR-PRE2s.

Step 2 If the startup configuration is not up to date, save the running configuration using the write-memory

command.

Step 3 Copy the startup configuration from the active ESR-PRE2 to a disk or TFTP server to save it for possible

rollback.

Step 4 At the console, use the boot system bootflash:image_name command to edit your boot system variable

to point to the 12.2(28)SB image in bootflash. Save the running configuration using the write memory command.

Use the show bootvar command to verify that the boot system variable has been altered appropriately on both the active and standby ESR-PRE2s.

If you do not want to make further changes to the startup configuration for the new command set offered by release 12.2(28)SB, skip to Step 7.

Note In some older releases, the configuration does not explicitly specify the redundancy mode. If your

Step 5 Your startup configuration now reflects the altered boot system image. Copy it to the TFTP server and

Step 6 Verify again that the boot image and config-register are set appropriately using the show bootvar

command.

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Obtaining Documentation

Step 7 On the active ESR-PRE2 in privileged EXEC mode, enter the hw-module sec-cpu reset command to

reboot the standby ESR-PRE2. This will load the 12.2(28)SB image from bootflash, and the standby PRE2 will come up in RPR mode.

Note The standby ESR-PRE2 is now in cold standby RPR state. It has not yet processed its configuration. You

can verify its redundancy mode using the show redundancy command on the active ESR-PRE2.

Step 8 From the active ESR-PRE2, enter the redundancy force-switchover main-cpu command in privileged

EXEC mode. The standby ESR-PRE2 will become the new active ESR-PRE2 (running 12.2S), and the former active ESR-PRE2 will become the standby ESR-PRE2. Check that the system is carrying traffic. Verify the autoboot string and IOS version using the show bootvar and show version commands.

Note Now you should test the 12.2(28)SB image to determine whether or not a rollback to the previous version

is needed.

Step 9 When you know that rollback is not needed, enter the write memory command from the active console

to bring the startup configuration up to date on the active and standby ESR-PRE2s.

If you need to roll back, follow the procedure in the next section.

Rollback Procedure for Option 4

If the newly active ESR-PRE2 does not operate satisfactorily after Step 8, you can initiate a rollback switchover to revert to the original 12.3 operating system.

To initiated a rollback switchover, follow these steps:

Step 1 Copy the original startup configuration from the TFTP server to the startup configuration on the active

and standby ESR-PRE2s using the copy tftp startup and copy tftp stby-nvram:startup-config commands.

Step 2 Use the show bootvar command to verify that this action has modified the boot variable to point to the

old release image.

Step 3 Enter the hw-module standby-cpu reset command from the active console. This command resets the

standby ESR-PRE2, which will autoboot to the old release image and come up as the standby ESR-PRE2 in RPR mode.

Step 4 Enter the redundancy force-switchover main-cpu command from the active console. This is a

service-affecting step. The standby ESR-PRE2 will come up as the active ESR-PRE2 running the old release. The standby ESR-PRE2 will autoboot to the old release, running in RPR+ mode.

You have now reverted to the original system configuration.

Obtaining Documentation

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Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.

Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

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Documentation Feedback

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You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:

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Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you might have identified a vulnerability in a Cisco product, contact PSIRT:

• Emergencies— security-alert@cisco.com

An emergency is either a condition in which a system is under active attack or a condition for which a severe and urgent security vulnerability should be reported. All other conditions are considered nonemergencies.

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Tip We encourage you to use Pretty Good Privacy (PGP) or a compatible product to encrypt any sensitive

information that you send to Cisco. PSIRT can work from encrypted information that is compatible with PGP versions 2.x through 8.x.

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Never use a revoked or an expired encryption key. The correct public key to use in your correspondence with PSIRT is the one linked in the Contact Summary section of the Security Vulnerability Policy page

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Obtaining Technical Assistance

at this URL:

http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

The link on this page has the current PGP key ID in use.

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product ID or model name; by tree view; or for certain products, by copying and pasting show command output. Search results show an illustration of your product with the serial number label location highlighted. Locate the serial number label on your product and record the information before placing a service call.

Submitting a Service Request

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For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.

To open a service request by telephone, use one of the following numbers:

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For a complete list of Cisco TAC contacts, go to this URL:

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Definitions of Service Request Severity

To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.

Severity 1 (S1)—Your network is “down,” or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.

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Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.

Obtaining Additional Publications and Information

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• Cisco Marketplace provides a variety of Cisco books, reference guides, documentation, and logo

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http://www.ciscopress.com

• Pack et magazine is the Cisco Systems technical user magazine for maximizing Internet and

networking investments. Each quarter, Packet delivers coverage of the latest industry trends, technology breakthroughs, and Cisco products and solutions, as well as network deployment and troubleshooting tips, configuration examples, customer case studies, certification and training information, and links to scores of in-depth online resources. You can access Packet magazine at this URL:

http://www.cisco.com/packet

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Obtaining Additional Publications and Information

• iQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies

learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions. You can access iQ Magazine at this URL:

http://www.cisco.com/go/iqmagazine

or view the digital edition at this URL:

http://ciscoiq.texterity.com/ciscoiq/sample/

• Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering

professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:

http://www.cisco.com/ipj

• Networking products offered by Cisco Systems, as well as customer support services, can be

obtained at this URL:

http://www.cisco.com/en/US/products/index.html

• Networking Professionals Connection is an interactive website for networking professionals to share

questions, suggestions, and information about networking products and technologies with Cisco experts and other networking professionals. Join a discussion at this URL:

http://www.cisco.com/discuss/networking

• World-class networking training is available from Cisco. You can view current offerings at

this URL:

http://www.cisco.com/en/US/learning/index.html

CCVP, the Cisco logo, and the Cisco Square Bridge logo are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn is a service mark of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, Follow Me Browsing, FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, iPhone, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, iQuick Study, LightStream, Linksys, MeetingPlace, MGX, Networking Academy, Network Registrar, PIX, ProConnect, ScriptShare, SMARTnet, StackWise, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.

All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0709R)

Printed in the USA on recycled paper containing 10% postconsumer waste.

Upgrading to Cisco IOS Release 12.2(28)SB on a Cisco 10000 Series Router

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