Nexus 9000 Series,NX‑OS 9.3(5)

Overview

NX‑OS Release 9.3(5) delivers software updates for Nexus 9000 Series switches running in NX‑OS mode.
This release includes new software features, expanded hardware support, known open issues, and resolved issues.

New Software Features

Enhanced Protocol and Feature Support

  • 25G FCoE support added for N9K-C93180YC-FX, N9K-C93180YC-EX, and N9K-C93360YC-FX2 platforms.
  • Alias option for sensor path in model‑driven telemetry added for Nexus 9000 Series switches and line cards.
  • ARP suppression with reflective relay supports coexistence on multiple fixed platforms.
  • MAC Authentication Bypass Only (MAB) authentication can now be default for all traffic on dot1x‑enabled ports.
  • BGP Prefix Independent Convergence (PIC) Core support added for high‑scale routing on select platforms.
  • Breakout support enhanced with 2×50G, 4×10G, 4×25G modes on applicable platforms.
  • Software image compaction support during copy operations on supported fixed platforms.
  • Software upgrade history capability enables preservation of upgrade history across updates.
  • Configuration replace enhancements including FEX interfaces and port profiles.
  • Configure jobs mode option added to configuration replace workflows.
  • Consistency checkers for ACLs, switchport, multicast, VLAN, segment routing, and SVI/sub‑interfaces.
  • Device LED conversion support for smart license conversions across Nexus 9000 Series.
  • DHCPv6 Option 79 support for selected high‑performance platforms.
  • DSCP wildcard mask ACL support for QoS filtering.
  • Dual RD support for Multi‑Site route reorigination on anchor switches.
  • In‑Service ACL Refresh for ITDv6 on select platforms.
  • Interface statistics support expanded for virtual Nexus devices.
  • IP Source Guard (IPSG) support on high‑performance fixed platforms.
  • IPv6 egress ACL and IPv6 First Hop Security (FHS) support on select systems.
  • IPv6 enhancements including flow label hashing and MLD snooping.
  • ISSU support for uRPF configurations on select leaf platforms.
  • TCP/UDP telemetry features and NX‑API and NETCONF/gRPC enhancements for programmatic access.

New Hardware Features

Fixed Switch Platforms

  • New N9K‑C93180YC‑FX3S switch is supported, featuring:
    • 48×1/10/25G fiber ports + 6×40/100G QSFP28 uplinks
    • One management 10/100/1000BASE‑T port
    • Console and USB port support
      Native FC not supported due to hardware limitations.

Supported Hardware

Fixed Switches

Product ID Description
N9K-C93180YC-FX3S 48×1/10/25G + 6×40/100G fixed switch
N9K-C93180YC-FX 48×1/10/25G + 6×40/100G fixed switch
N9K-C93180YC-EX Enhanced fixed switch
N9K-C9332C 32×40/100G + 2×1/10G
N9K-C9336C-FX2 36×40/100G fixed switch
N9K-C9364C-GX 64×40/100G fixed switch
N9K-C93360YC-FX2 High‑density fixed switch

Modular Switch Platforms

Product ID Description
N9K-C9504 Modular chassis with up to 4 line cards
N9K-C9508 Modular chassis with up to 8 line cards
N9K-C9516 Modular chassis with up to 16 line cards

Line Cards

Product ID Description
N9K-X9736C-FX 36×40/100G QSFP28
N9K-X9732C-FX 32×40/100G QSFP28
N9K-X9732C-EX Enhanced 32×40/100G
N9K-X9636C-R 36×40/100G R‑Series
N9K-X9636C-RX Enhanced R‑Series line card
N9K-X9636Q-R 36×40G R‑Series

Open Issues

Bug ID Description
CSCvu86996 Kernel panic causing continuous reloads on some platforms after update to 9.3(3).
N/A NX‑API insecure HTTP not supported by default.
N/A NX‑API weak TLSv1 protocol disabled.
N/A Only one of v4/v6 uRPF can be configured per interface; other version blocked.
CSCvt99828 Invalid “none” authName value is not accepted; must use allowable values.
CSCvt99859 Allocate-label option not shown unless MPLS L3 VPN enabled.
CSCvt93823 NVE source‑interface change requires NVE shutdown first.
CSCvu48474 FC‑FEC unsupported on non‑retimer 2×50G breakout ports.
N/A Intermittent CRC errors on retimer ports with certain breakouts.
N/A ISIS route deletion issue when IP unnumbered config toggled quickly.
N/A NX‑API sandbox XML/JSON output may contain extra characters.
N/A Manual breakout config removal required post‑upgrade for some QSFPs.
N/A Fan speed changes may occur post‑upgrade due to airflow design on certain PIDs.

Resolved Issues

Bug ID Description
Resolved Stability enhancements for maintenance profile modification crash conditions.
Resolved Multicast flooding behavior and FEX reception issues corrected.
Resolved IGMP route cleanup after static join removal improved.
Resolved PIM register behavior now enabled by default for appropriate platforms.
Resolved mroute summary counters display accuracy improvements.

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