Introduction to this Document

This Release Notes document provides information about the Cisco Catalyst IR1101 Rugged Series Routers and Cisco ESR6300 Embedded Series Routers running Cisco IOS XE 17.3.5.

This document describes the new features, limitations, troubleshooting, besides providing recommended configurations, caveats, and information on how to obtain support and documentation.


The documentation set for this product strives to use bias-free language. For purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product.

Cisco Catalyst IR1101 Rugged Series Router

The Cisco Catalyst IR1101 Rugged Series Router is a next-generation modular industrial router, which has a base platform with additional pluggable modules that can be added. The pluggable modules provide the flexibility of adding different interfaces to the IR1101 platform, for example, a cellular module, which provides Fourth-Generation Long-Term Evolution (4G LTE) cellular networks and Third-Generation (3G) cellular networks.

The IR1101 also has an expansion module that adds key capabilities to the IR1101, such as mSATA SSD FRU, Ethernet SFP port, and digital GPIO connections. The expansion module also makes the IR1101 dual LTE capable, with one LTE module in the base and the other LTE module in the expansion module.


The IR-1100-SP expansion module is the same as the IR-1100-SPMI module, without the digital I/O and mSATA components.

Cisco ESR6300 Embedded Series Router

The ESR6300 is a small form factor embedded router module with a board size of 3.0 in. x 3.775 in. (76.2 mm x 95.885 mm).

The more compact design simplifies integration, and offers system integrators the ability to use the Cisco ESR6300 in a wide variety of embedded applications. The ESR module is available with a Cisco-designed cooling plate customized to the ESR, as well as without the cooling plate for system integrators who want to design their own custom thermal solution.

There are two ESR6300 SKUs:

  • ESR-6300-NCP-K9: Embedded Router Board without a cooling plate (NCP = No Cooling Plate)

  • ESR-6300-CON-K9: Embedded Router Board without a cooling plate (NCP = No Cooling Plate)

Both of the SKUs offer the following port and module interfaces:

  • Four GE LAN ports

  • Two combo GE WAN ports

  • One USB 3.0 port

  • One mSATA module interface

Interface Naming Conventions

Cisco Catalyst IR1101 Rugged Series Router


Naming Convention

Gigabit Ethernet combo port


Gigabit Ethernet SFP port on Expansion Module


Fast Ethernet ports


Cellular Interface on IR1101 Base

Cellular 0/1/0 and Cellular 0/1/1

Cellular Interface on Expansion Module

Cellular 0/3/0 and Cellular 0/3/1

Asynchronous Serial Interface






IR1101 Base Unit Alarm input

alarm contact 0

GPIO on Expansion Module

alarm contact 1-4

Cisco ESR6300 Embedded Series Router


Naming Convention

Gigabit Ethernet combo port WAN Layer3



Gigabit Ethernet LAN Layer 2 ports





USB Port

usbflash0: (IOS and rommon)

Console Port

Line console 0

Software Images for Cisco IOS XE Release 17.3.5


You must have a account to download the software.
Table 1. Software Images for Cisco IOS-XE, Release 17.3.5


Image Type










The latest software downloads for the routers can be found at:

Click the link corresponding to your device to take you to the specific software you are looking for.

New Features in Cisco IOS XE 17.3.5

There are no new features with this release.

Known Limitations

This release has the following limitations or deviations from expected behavior. These limitations are listed below by router type.

Smart Licensing

Starting with Cisco IOS XE 17.6.1, with the introduction of Smart Licensing Using Policy, even if you configure a hostname for a product instance or device, only the Unique Device Identifier (UDI) is displayed. This change in the display can be observed in all licensing utilities and user interfaces where the hostname was displayed in earlier releases. It does not affect any licensing functionality. There is no workaround for this limitation.

The licensing utilities and user interfaces that are affected by this limitation include only the following: Cisco Smart Software Manager (CSSM), Cisco Smart License Utility (CSLU), and Smart Software Manager On-Prem (SSM On-Prem).


Caveats describe unexpected behavior in Cisco IOS XE releases. Caveats listed as open in a prior release are carried forward to the next release as either open or resolved.

The Cisco Bug Search Tool (BST) is a gateway to the Cisco bug-tracking system, which maintains a comprehensive list of defects and vulnerabilities in Cisco products and software. The BST provides you with detailed defect information about your products and software.

Open Caveats in Cisco IOS XE 17.3.5

There are no open caveats to report in this release.

Resolved Caveats in Cisco IOS XE 17.3.5

To view the details of a caveat, click on the identifier.





No radius packets sent from the router while using type 6 password encrytption



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