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Cisco’s Resilient Infrastructure initiative raises security defaults across its networking portfolio, phases out insecure legacy features, and adds stronger authentication and telemetry. Customers should inventory their equipment, apply the relevant hardening guides, and plan for software and lifecycle changes; the program does not mean every organization must immediately replace its routers or switches.

What Cisco’s Resilient Infrastructure initiative changes

Cisco describes the program as “Redefining Default Security for a Stronger Future.” It applies across network products and related software, including routers, switches, and firewalls. Upcoming releases are intended to strengthen default protections, retire insecure legacy features, and add security capabilities. Some changes may require action on systems already in use, not only on new installations. Cisco’s Resilient Infrastructure overview sets out the program and customer guidance.

Stronger defaults and more visible risks

Planned changes include disabling services such as web servers, SNMP, and guest shell by default; requiring stronger cryptography and credentials; and warning administrators when they configure insecure practices. Cisco senior vice president and chief security and trust officer Anthony Grieco says the aim is to make it “incredibly obvious” when customers configure features that introduce unnecessary network risk.

More authentication and secure transport options

Cisco lists planned capabilities including TACACS+ over TLS 1.3, secure RADIUS transport, FIDO2 over SSH, and scalable SSH public-key authentication with TACACS+. These options are intended to strengthen device access and the protection of authentication traffic. Availability depends on the relevant product and software release; consult Cisco’s product documentation before designing a deployment around a particular capability.

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How deprecated features are phased out

Cisco’s approach has three stages: warning, restriction, and removal. A feature may remain usable in an existing deployment for a time after warnings begin, while a new installation or later release may require an administrator to enable it explicitly. The timetable can vary by feature; Cisco says widely used capabilities such as SNMPv2 may be phased out more slowly than less-used ones.

  1. Warning: Cisco flags insecure configurations so teams can identify them and plan a change.
  2. Restriction: Use becomes more limited, such as requiring explicit enablement rather than working by default.
  3. Removal: The feature is no longer available in the applicable release.

Do not assume that every device will follow the same schedule or that a warning means a feature has already stopped working. Check release notes and product-specific notices for the device and software version in question.

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What network teams should do now

Cisco’s near-term advice is to reduce exposure before future defaults and restrictions take effect. The first steps are inventory and configuration work, not an automatic hardware refresh.

  • Inventory devices and software. Record product models, software versions, network roles, and dependencies on legacy services or protocols.
  • Check support dates. Review each product’s End of Vulnerability Support (EoVSS) and Last Day of Support (LDOS) dates. A device approaching either milestone needs a planned path to supported software or replacement.
  • Apply the relevant hardening guide. Cisco advises: “Apply the relevant Cisco hardening guide today to reduce your attack surface now and smooth the path to future hardened releases.” Prioritize unnecessary services, weak protocols, credentials, and management access.
  • Assess dependencies before disabling a feature. Identify monitoring systems, applications, and network peers that rely on a service such as SNMPv2, then test a supported alternative and schedule the change.
  • Run current software and follow notices. Track Cisco security and product notices, review release notes, and keep devices on current supported releases appropriate to your environment.
  • Test upgrades and authentication changes. Validate compatibility, management access, logging, and rollback procedures in a representative environment before broad deployment.

The right sequence depends on lifecycle status, existing security posture, legacy-protocol dependencies, logging and telemetry needs, authentication options, upgrade disruption, and the cost of replacement. Cisco Live Protect is described as a temporary runtime-protection bridge while organizations test and deploy permanent patches; it is not a substitute for a permanent software fix.

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How Cisco’s security-release schedule fits in

In a June 2, 2026 blog, Cisco vice president Russ Smoak said the company planned to begin a scheduled, twice-monthly security disclosure model in July 2026, with seven days’ advance notice of the technologies covered in each release. Cisco reserves the first and third Wednesdays for hardened software publications.

The schedule distinguishes broad hardened-software publications from a quarterly plan for core network operating systems: IOS XE, IOS XR, NX-OS, Firepower/ASA, and SD-WAN. Emergencies, active exploitation, and zero-day issues remain outside the normal cycle. Cisco says hardened releases address systemic defect patterns identified through static analysis, live-system testing, configuration review, and exploit simulation, with security engineers validating and prioritizing fixes. This is more than a calendar for isolated vulnerability fixes: it is also intended to address recurring classes of defects.

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Smoak’s guidance is to run a current hardened release rather than patch individual findings across older releases. Teams should still assess each advisory and product’s supported upgrade path; a scheduled cadence does not remove the need to respond to urgent security notices.

Will you need to replace an aging Cisco router or switch?

Not necessarily immediately. The initiative changes software defaults and feature support as well as device security expectations. An in-support device that can run a suitable current release may be addressed through hardening and upgrades. A device near or beyond EoVSS or LDOS, or one that cannot support required protections, may need replacement planning.

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Network World reports that Cisco says customers may need to update or replace aging routers, switches, and firewalls. It also reports that 48% of network assets worldwide are aging or obsolete, citing a Cisco-commissioned 2025 report. That percentage is a secondary-reported figure, not a number established here from the underlying report, and it should not be treated as a measurement of any one organization’s estate.

For each device, compare its lifecycle status, available security defaults, ability to disable or replace insecure protocols, telemetry and logging, authentication support, upgrade disruption, and total replacement cost. The result may be a software upgrade, a staged migration, or replacement; age alone does not settle the decision.

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