The following are the minimum system requirements:

Note	There is no change in the system requirements from the earlier releases.

• Memory: 4GB DDR3 up to 16GB

• Hard Drive: 200GB or higher (Optional). (The hard drive is only required for running services such as Cisco ISR-WAAS.)

• Flash Storage: 4GB to 32GB

  Note	There is no change in the flash storage size from the earlier releases. The flash storage size must be equal to the system memory size.

• NIMs and SM-Xs: Modules (Optional)

• NIM SSD (Optional)

For more information, see the Cisco 4000 Series ISRs Data Sheet.

Note	For more information on the Cisco WAAS IOS-XE interoperability, refer to the WAAS release notes: https://www.cisco.com/c/en/us/support/routers/wide-area-application-services-waas-software/products-release-notes-list.html

You can use the following commands to verify your software version:

• For a consolidated package, use the show version command

• For individual sub-packages, use the show version installed command

To install or upgrade, obtain a Cisco IOS XE Amsterdam 17.1.1 consolidated package (image) from Cisco.com. You can find software images at http://software.cisco.com/download/navigator.html. To run the router using individual sub-packages, you also must first download the consolidated package and extract the individual sub-packages from a consolidated package.

Note

When you upgrade from one Cisco IOS XE release to another, you may see %Invalid IPV6 address error in the console log file. To rectify this error, enter global configuration mode, and re-enter the missing IPv6 alias commands and save the configuration. The commands will be persistent on subsequent reloads.

For more information on upgrading the software, see the How to Install and Upgrade the Software section of the Software Configuration Guide for the Cisco 4000 Series ISRs.

You can use Cisco Feature Navigator to find information about feature, platform, and software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn . An account on cisco.com is not required.

For a router with 3G/4G interface, sometimes service provider network might be busy, congested, in maintenance or in fault state. In such circumstances, service provider network rejects session activation request from the router by returning reject cause code 33 as a response of the activation request. After the router receives the reject cause, the router uses the back-off operation with the pre-defined timer value which could be carrier-specific. While back-off operation is in progress, no new session activation request is sent out from the router. After the back-off period is up, new session activation request is sent out from the router.

Note: There is no command to disable the cellular back-off feature on the router.

The following example shows how to configure the cellular back-off feature to stop continuous session activation requests back to the router:

Router#show cell 0/2/0 all
Profile 1, Packet Session Status = INACTIVE
Profile 2, Packet Session Status = INACTIVE
Profile 3, Packet Session Status = INACTIVE
.
.
.
Success rate is 0 percent (0/5)
Router#show cell 0/2/0 c     
Profile 1, Packet Session Status = INACTIVE
Profile 2, Packet Session Status = INACTIVE
Profile 3, Packet Session Status = INACTIVE
RouterCall end mode = 3GPP
RouterSession disconnect reason type = 3GPP specification defined(6)
RouterSession disconnect reason = Option unsubscribed(33)
RouterEnforcing cellular interface back-off
	Period of back-off = 1 minute(s)
Profile 4, Packet Session Status = INACTIVE
...
Profile 16, Packet Session Status = INACTIVE

.
.
.
Profile 16, Packet Session Status = INACTIVE

This section explains how to configure the router to access Web User Interface. Web User Interface require the following basic configuration to connect to the router and manage it.

• An HTTP or HTTPs server must be enabled with local authentication.

• A local user account with privilege level 15 and accompanying password must be configured.

• Vty line with protocol ssh/telnet must be enabled with local authentication. This is needed for interactive commands.

• For more information on how to configure the router for Web User Interface, see Cisco 4000 Series ISRs Software Configuration Guide, Cisco IOS XE 17.

This section provides information about the caveats in Cisco 4000 Series Integrated Services Routers and describe unexpected behavior. Severity 1 caveats are the most serious caveats. Severity 2 caveats are less serious. Severity 3 caveats are moderate caveats. This section includes severity 1, severity 2, and selected severity 3 caveats.

The open and resolved caveats for this release are accessible through the Cisco Bug Search Tool . This web-based tool provides you with access to the Cisco bug tracking system, which maintains information about bugs and vulnerabilities in this product and other Cisco hardware and software products. Within the Cisco Bug Search Tool, each bug is given a unique identifier (ID) with a pattern of CSCxxNNNNN, where x is any letter (a-z) and N is any number (0-9). The bug IDs are frequently referenced in Cisco documentation, such as Security Advisories, Field Notices and other Cisco support documents. Technical Assistance Center (TAC) engineers or other Cisco staff can also provide you with the ID for a specific bug. The Cisco Bug Search Tool enables you to filter the bugs so that you only see those in which you are interested.

In addition to being able to search for a specific bug ID, or for all bugs in a product and release, you can filter the open and/or resolved bugs by one or more of the following criteria:

• Last modified date

• Status, such as fixed (resolved) or open

• Severity

• Support cases

You can save searches that you perform frequently. You can also bookmark the URL for a search and email the URL for those search results.

Note	If the defect that you have requested cannot be displayed, this may be due to one or more of the following reasons: the defect number does not exist, the defect does not have a customer-visible description yet, or the defect has been marked Cisco Confidential.

We recommend that you view the field notices for the current release to determine whether your software or hardware platforms are affected. You can access the field notices from the following location:

http://www.cisco.com/en/US/support/tsd_products_field_notice_summary.html