Release Notes for Cisco 1000 Series Integrated Service Routers, Release 17.18.x

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Updated:August 15, 2025

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Updated:August 15, 2025
 

Cisco 1000 Series Integrated Services Routers, Release 17.18.1a........ 3

New software features. 3

New hardware features. 3

Changes in behavior 3

Resolved issues. 3

Open issues. 3

Known issues. 4

Compatibility. 4

Scalability. 4

Supported hardware. 4

Supported software packages. 4

Related resources. 4

Legal information. 5

 


 

Cisco 1000 Series Integrated Services Routers, Release 17.18.1a

Cisco IOS XE 17.18.1a is the first release for Cisco 1000 Series Integrated Services Routers in the Cisco IOS XE 17.18.x release series.

The key highlights of this release include:

●     Monitoring & Observability

●     Cellular, IPv6, Voice, Virtualization

●     SRv6 Enhancements

●     Security and SASE enhancements

New software features

This section provides a brief description of the new software features introduced in this release.

Table 1.             New software features for Cisco 1000 Series Integrated Services Routers, Release 17.18.1a

Product impact

Feature          

Description

Ease of Use

 

Support to upgrade Firmware

From Cisco IOS XE 17.18.1a release, you can now upgrade the firmware image for cellular module, LTE module, or Wi-Fi module of supported devices using Cisco Catalyst SD-WAN Manager, without configuring and managing multiple commands for each device and its associated modules.

Ease of Use

 

Hosted Edge Services for SD-Routing Devices

From Cisco IOS XE 17.18.1a release, Cisco Catalyst SD-WAN Manager supports deployment of IOx applications such as Cyber Vision, Thousand Eyes, UTD, and so on. The support to monitor these applications is introduced through Hosted Edge Services monitoring dashboard which offers a simplified user experience for overseeing IOx container applications across multiple devices. The Hosted Edge Services monitoring dashboard is introduced on Cisco Catalyst SD-WAN Manager version 20.18.x.

Ease of setup

 

Cisco Secure Routers SWIM and Onboarding Tool

 

Cisco IOS XE 17.18.1a introduces the Cisco Secure Routers Software Image Management (SWIM) and Onboarding tool that helps customers upgrade and onboard autonomous hardware devices to cloud-hosted or on-premises Catalyst Cisco SD-WAN Manager.

Security

 

Custom IPS signature sets

From Cisco IOS XE 17.18.1a release, Custom IPS signature sets are supported in Cisco SD-WAN Manager, which allows you to create and deploy personalized Snort3 IPS signature sets.This feature allows direct modification of actions for existing IPS rules within profiles and supports building custom rules using rule groups or existing rules. With Custom IPS signature sets, organizations can gain greater control and precision in tailoring threat detection to their specific security needs.

Ease of Use

 

Certificate Management on SD-Routing Devices

This feature introduces a new certificate authorization setting, Enterprise Certificate Settings, which unifies certificate configurations for SD-Routing devices. Cisco SD-WAN Manager automates certificate management by leveraging protocols like EST (Enrolment over Secure Transport) and SCEP (Simple Certificate Enrolment Protocol). The feature automates the enrolment, and renewal of certificates.

Ease of use

 

Configure cellular band select for cellular interfaces on SD-Routing devices

You can select specific frequency bands to which the device can connect to, allowing optimized connection depending on location and network availability. This configuration can be done using Feature Parcels in Catalyst Cisco SD-WAN Manager.

Ease of use

 

Configure logging of crash dump events for cellular interfaces  on SD-Routing devices

You can configure the device to collect the crash dump logs by enabling the boot-and-hold mode on the device using the lte modem crash-action boot-and-hold command.

Ease of use

 

Reset cellular profile for cellular interfaces on SD-Routing devices

You can reset the cellular network profile settings on a specific interface to a factory default state using the cellular<slot> lte profile reset  command.

Ease of use

 

Enable diagnostic monitoring for SD-Routing devices

You can enable diagnostic monitoring log capture for devices with cellular interfaces using Catalyst Cisco SD-WAN Manager.

Ease of Use

 

Show drops command

 

The *show drops* command is introduced in Cisco IOS XE 17.18.1a. This command consolidates multiple platform and protocol-specific debugging tools into a single, user-friendly interface, enabling network operators to efficiently identify the root causes of packet drops. By streamlining the troubleshooting process, this feature significantly improves operational efficiency and network performance.

Upgrade

 

MVPN Ingress Replication (IR) over SRv6

This feature enables the transport of IPv4 MVPN traffic across an SRv6 network. It simplifies multicast deployment by using the existing SRv6 unicast infrastructure as the underlay. With this feature, the ingress PE router receives multicast traffic and creates a separate unicast SRv6-encapsulated copy for each egress PE router in the multicast group.

Upgrade

 

SRv6 Path MTU Discovery

This feature introduces a mechanism to determine the maximum transmission unit (MTU) for packets traversing an SRv6 underlay network. It ensures efficient packet forwarding by preventing fragmentation and packet drops, thereby allowing network devices to dynamically adjust packet sizes to avoid exceeding link MTU limits. The system relays ICMP Packet Too Big (PTB) messages from the SRv6 underlay to the IPv6/IPv4 overlay network, supporting both Transit-node and Headend-node PTB relay methods.

Upgrade

 

SRv6 Flex-Algo with TI-LFA and uLoop Avoidance

From Cisco IOS XE 17.18.1a, Flexible Algorithm enhances SRv6 by including functions like Topology Independent Loop-Free Alternate (TI-LFA) and microloop (uLoop) avoidance. This feature improves network resilience and efficiency.

CUBE FEATURES

Ease of Use

Enhanced support for serviceability in SIP recording

From Cisco IOS XE 17.18.1a onwards, serviceability is enhanced to display consolidated information on forked and associated anchor call legs.

Upgrade

Third-Party GUID capture for correlation between call transfers and SIP-based recording

From Cisco IOS XE 17.18.1a onwards, the Third-Party GUID capture for correlation between calls and SIP-based recording is extended to support transmission of globally unique identifiers (GUIDs) to the recording server during call transfers.

Upgrade

IOS UC apps reports smart licensing flex subscription entitlement tag

From Cisco IOS XE 17.18.1a onwards, CUBE and SRST smart licensing reports flex subscription entitlement tag on all the supported platforms.

Resolved issues

This table lists the resolved issues in this specific software release.

Note: This software release may contain bug fixes first introduced in other releases. To see additional information, click the bug ID to access the Cisco Bug Search Tool. To search for a documented Cisco product issue, type in the browser: <bug_number> site:cisco.com.

Table 2.        Resolved issues for Cisco 1000 Series Integrated Services Routers, Release 17.18.1a

Bug ID

Description

CSCwn12594

17.16 SIG zscaler ipsec - vpn credentials for primary tunnel not created

CSCwn42496

Device crashed @bfd_send_and_detect_sleep_time  during soak run

CSCwn69868

Unable to come up control connections with controllers after controllers added and down/up

CSCwo72675

All BFD sessions for dialer interfaces are down. SA ID is 0 for all of them.

CSCwo84428

Memory leak under vdaemon process with DTLS on SNMP polling

CSCwp24639

Device reloads after VPN config changes on SDWAN

CSCwm27749

Speed test download / throughput issue on device seen with IPSEC ESP-NULL transform using  Zscaler

CSCwm72336

CXP with Data Policy redirect-DNS via overlay causes blackhole

CSCwn26353

BFD sessions via TLOC-Ext do not come up when IPv6 is dynamically changed

CSCwo05703

SD-WAN: VFR is not dynamically disabled After ZBFW Removal

CSCwo75657

Maximum control connection is not equal to maximum omp sessions

CSCwp91064

FTMD zero pointer dereferences leading to crash

Open issues

This table lists the open issues in this specific software release.

Note: This software release may contain open bugs first identified in other releases. To see additional information, click the bug ID to access the Cisco Bug Search Tool. To search for a documented Cisco product issue, type in the browser: <bug_number> site:cisco.com.

Table 3.             Open issues for Cisco 1000 Series Integrated Services Routers, Release 17.18.1a

Bug ID

Description

CSCwp12196

Device unexpectedly reloads due to memory corruption on a notification queue in FTMd

CSCwq27426

BFD session down due to unencrypted outbound BFD packets despite active IPsec SA

CSCwe19394

Device may boot up into prev_packages.conf due to power outage

CSCwo42664

Keyman core files on device

CSCwp01089

EPFR-High latency times are observed on the hub device

CSCwp81539

Memory leak under cfgmgr process on SNMP polling

CSCwq20326

Device does not install service-side static route to CEF after upgrade

CSCwq40026

Unexpected reboot occurs due to process FTMD

CSCwq68385

TLOC disabled after link down; no automatic tunnel recovery after link restores and TLOC state Is Up 

CSCwq60993

EM9293 module not able to acquire GPS coordinates 

ROMmon Compatibility Matrix

The following table lists the ROMmon releases supported in Cisco IOS XE 16.x.x releases and Cisco IOS XE 17.x.x releases.

To identify the manufacturing date, use the show license udi command. For example:

Router#show license udi

UDI: PID:C1131-8PLTEPWB,SN:FGLxxxxLCQ6

The xxxx in the command output represents the manufacturing date.

●     If the manufacturing date is greater than or equal to 0x2535, the manufactured ROMmon version is 17.6(1r) or higher.

●     If the manufacturing date is less than 0x2535, the ROMmon will be automatically upgraded to 17.5(1r) or above when the Cisco IOS XE 17.9.x release is installed.

●     The minimal or recommended ROMmon version for devices using Cisco IOS XE 17.5 or later is 17.5(1r) or later.

Table 4.             Minimum and Recommended ROMmon Releases Supported on Cisco 1000 Series ISR Routers

Cisco IOS XE Release

Minimum ROMmon Release for IOS XE          

Recommended ROMmon Release for IOS XE

17.18.x

17.5(1r)

17.5(1r)

17.16.x

17.5(1r)

17.5(1r)

17.15.x

17.5(1r)

17.5(1r)

17.14.x

17.5(1r)

17.5(1r)

17.13.x

17.5(1r)

17.5(1r)

17.12.x

17.5(1r)

17.5(1r)

17.11.x

17.5(1r)

17.5(1r)

17.10.x

17.5(1r)

17.5(1r)

17.9.x

17.5(1r)

17.5(1r)

17.8.x

17.5(1r)

17.5(1r)

17.7.x

17.5(1r)

17.5(1r)

17.6.x

17.5(1r)

17.5(1r)

17.5.x

17.5(1r)

17.5(1r)

17.4.x

16.12(2r)

16.12(2r)

17.3.x

16.12(2r)

16.12(2r)

17.2.x

16.9(1r)

16.12(1r)

17.1.x

16.9(1r)

16.12(1r)

16.12.x

16.9(1r)

16.12(1r)

16.11.x

16.9(1r)

16.9(1r)

16.10.x

16.9(1r)

16.9(1r)

16.9.x

16.9(1r)

16.9(1r)

16.8.x

16.8(1r)

16.8(1r)

16.7.x

16.6(1r)

16.6(1r)

16.6.x

16.6(1r)

16.6(1r)

Related resources

●     Release Notes for Previous Versions of Cisco 1100 Integrated Services Router

●     Data sheet for Cisco 1100 Integrated Services Router

●     Hardware Installation Guide

●     Software Configuration Guide

●     Cisco Smart Licensing Guide

●     Smart Licensing using Policy

Legal information

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned 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. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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