Fixed: The controller does not send mDNS queries or responses after upgrade to 17.12.6 or 17.15.4

What's New in Cisco IOS XE 17.15.4b

Wired Proximity-Based Resolution:
The Wired Proximity-Based Resolution feature supports Wi-Fi 7 Access Points (APs) by offering an additional method to determine the country code during AP provisioning. When APs are connected to the same switch and can detect each other using Cisco Discovery Protocol (CDP) or Link Layer Discovery Protocol (LLDP), they are identified as neighbors and included in a neighborhood graph.

However, if an AP has a wired neighbor that is only one hop away, it will not be considered an adjacency for this feature. This is because the controller does not have visibility into the full network topology or the CDP neighbors of the switch to which the AP is connected.

Open Issues for Cisco IOS XE 17.15.4d

• CSCwk79990: Controller encounters kernel unresponsiveness due to IntelResetRequest
• CSCwp21518: Cisco Catalyst Wireless 9164I and Cisco Catalyst IW9167IH APs experiences radio firmware kernel unresponsiveness
• CSCwp27215: Cisco Catalyst 9124 AP in Mesh mode encounters poor iperf traffic performance
• CSCwp61179: Cisco Catalyst 9130 AP fails in port authentication with ClearPass Server
• CSCwp65769: Wave 2 APs performing with fast transition with 802.1X authentication send incorrect M2 message during re-key on session timeout
• CSCwn55495: Cisco Catalyst 9800-40 controller displays random CPU spikes on EZMAN
• CSCwo86312: Controller shows a mismatch between client count from show client commands and SNMP walk total
• CSCwo92511: Controller has inconsistent default MTU settings for mobility tunnels
• CSCwp07279: Controller unexpectedly reloads due to local software fatal error
• CSCwp39409: Controller reboots unexpectedly due to an assertion failure in WNCd process
• CSCwp93598: Memory leak found in the controller process related to handling a specific database string

Resolved Issues for Cisco IOS XE 17.15.4d

• CSCwr09565: The controller does not send mDNS queries or responses after upgrade to 17.12.6 or 17.15.4
• CSCwr15607: mDNS browsing fails for 5 GHz clients when Location LSS is enabled on the controller
• CSCwn18885: Cisco Catalyst 9136 series APs encounter kernel unresponsiveness with last reload reason 'unknown'
• CSCwo98644: RRM does not update the default channel when using IPv6 only on the controller
• CSCwp06711: Static AP Location is overwritten as per Location Tag Configuration on WLC
• CSCwn77030: Controller does not process analytics action frames received from MLD for MLO clients
• CSCvy53719: Cisco Catalyst 9800-80 controller displays stale, non-impacting "mce: [Hardware Error]" messages during IOS-XE 17.x boot-up
• CSCwp59171: Users unable to add allowed user on Lobby admin page
• CSCwo89539: Controller reload unexpectedly when adding "location civic-location-id" to multiple interfaces
• CSCwn45380: Controller uses registry to initialize the trap queue length in SNMP
• CSCwo21938: AFC is using manual geolocation co-ordinates
• CSCwo95396: Cisco Catalyst 9800 CL and 9800L controllers reload while provisioning the controller from Cisco Catalyst Center
• CSCwn99763: Noise floor value is always displayed as 0 for a few x-paths
• CSCwo00821: IoT Orchestrator is unable to start after an upgrade or a reload
• CSCwo52310: Wireless cloud service consumes 100% CPU due to geolocation derivation
• CSCwp31397: Controller DFS Radar Detection results in most of the APs allocated to the same channel
• CSCwo62157: Controller with CAPWAP enabled display memory leak in tdl_mac_addr object
• CSCwo68664: Cisco Catalyst 9800-L controller in Software-Defined Access (SDA) Wireless does not enforce the Extensible Authentication Protocol (EAP) timeout
• CSCwn39428: Error message "Flow Monitor is Required" is shown even when flow monitor name is available
• CSCwp21187: Controller unexpectedly reboots due to due to mDNS packet
• CSCwo29017: wncmgrd kernel unresponsiveness after issue command ‘show ap config slots’
• CSCwo67294: Controller unexpectedly reloads due to a corrupted value in IGMP Layer 2 Snooping process
• CSCwn92827: Secondary controller fails with rsync error
• CSCwn93586: Cisco Catalyst 9176 AP operates in XOR mode, Channel and CW changes are not pushed post the DCA cycle
• CSCwo15982: Controller unexpectedly reboots with 17.15.3.14 image
• CSCwo54553: Controller displays traceback messages when default-policy-tag APs block initiates a configuration change for other APs due to Ref-count not zero
• CSCwj80614: Clients are unable to connect due to assignment of IP address that is in use by stale client entry in device-tracking database in FlexConnect local switching
• CSCwp16968: 1562 WGB FT Roaming client disconnection issue due to MAC record Mismatch
• CSCwo07767: Controller's active chassis get stuck in active recovery state on 17.12.4
• CSCwn92477: Controller unexpectedly reboots during WNCd process due to assertion failure with invalid BSSID
• CSCwo62333: Cisco Catalyst 9800-L controller in FlexConnect/Software Defined Access (SDA) fails to start MAB on association request
• CSCwn90855: Controller overrides client's IP address in the device tracking database causing packet loss
• CSCwn94511: The factory-reset all command is unsecure but functions as if it has a secure option
• CSCwo97886: Controller displays out of order packet issue with fragmented packet when Auto QoS is enabled
• CSCwo35645: NETCONF over SSH fails to return all the records for wireless-client-oper and shows 'invalid XML' before everything is returned
• CSCwo67413: Controller pushes aWIPS profiles from FQDN-only setup for intrusion detection
• CSCwp12959: wireless client gets excluded with one authentication failure or never gets excluded
• CSCwn11160: Controller running in High Availability in guest anchor sends traffic to the wrong tunnel after switchover for already connected clients
• CSCwo37680: Controller initiates client deletion with code: CO_CLIENT_DELETE_REASON_DOT11_MAX_STA
• CSCwn96363: Remove redundant counters from "show wireless stats ap name <ap> dot11 5GHz" output
• CSCwo70030: Rogue processing is performed by WNCd even though the "bssid-neighbor-stats" configuration is disabled
• CSCwm48458: Detecting radar on 5-GHz CH100 causes controller to mismatch to CM66 and switch dual mode from 6-GHz to 5-GHz
• CSCwn31021: Controller fails to represent the correct format of AP Name and VLAN ID in option 82
• CSCwo19011: Controller observes unexpected SISF reboot with WNCD core
• CSCwo30925: Cisco Wi-Fi 6 and above APs do not support disabling WMM on radios that support 802.11n/11ac/11ax operation
• CSCwp25552: BSSID-mac dispatched as 00:00:00:00:00:00 for slot 1 WLAN 1
• CSCwn33501: Controller connected to the AP does not give any output while executing the show ap summary sort name command
• CSCwp03988: Unexpected Reload Due to Unsuccessful copy of the MAC address
• CSCwo20395: Controller's rogue classification rules do not apply configured classifications
• CSCwo53638: Client error: High-availability data path setup failed on standby device in RA trace
• CSCwo61286: Audit session ID changes after inter-WNCd roam on Central Web Authentication (CWA) with PSK
• CSCwn94159: Controller with 6 GHz support AP's radio channel bandwidth changes due to DCA happening frequently
• CSCwn36778: Cisco Catalyst 9800-80 controller displays low memory leak potentially in the 'ipv4_addr' field
• CSCwp26707: Controller fails to start L2 authentication for 802.11r clients with vlan-persitent configured in 17.12.5
• CSCwp86129: Client connected to local mac-auth PSK or MPSK SSIDs get disconnected and do not remain connected to the controller
• CSCwo98083: Access points are unreachable in inventory on Cisco Connected Cloud version 2.3.7.9
• CSCwo64967: Mobility tunnel with data-link encryption intermittently disconnects when the fourth octet of the WMI address is 255
• CSCwp13687: Cisco Catalyst 9800-CL controller modifies the script generating SSC to avoid issues with RSA key generation impacting AP join
• CSCwo41248: Controller display wrong message when configuring 2 radios on the same UNII band (100 - 144)
• CSCwo80904: Cisco Catalyst 9164 and 9166 APs encounter kernel unresponsiveness due to radio failures (Beacon Stuck)
• CSCwo33572: Failed to collect RA tracing logs on Cisco IOS XE Release 17.9.5
• CSCwk48338: Cisco Catalyst 9130AX AP does not accept clients on the 5 GHz radio
• CSCwk79057: AP does not failover to the RADIUS server in FlexConnect Local Switching Local Authentication
• CSCwn88092: Unable to view the events for wireless clients in the Client 360 section of the Event Viewer
• CSCwn96529: Cisco Catalyst 9136I-ROW AP in Site-Survey mode cannot add country code "IN"
• CSCwo38789: Cisco Catalyst 9176 AP encounters watchdog reset (WCPD) kernel unresponsiveness due to memory leak in RRM module
• CSCwo48539: Cisco Catalyst 9124 MAP powered with 30W and joined to a Cisco Catalyst 9124 EWC RAP can enable Tri-Radio with the EWC GUI
• CSCwo60793: IOX app channel down as IOX app and CAF app state are mismatched
• CSCwo61838: Cisco Catalyst 9120 / 17.12.4 ESW13 encounters kernel unresponsiveness due to OOM process gRPC
• CSCwo68312: Cisco Catalyst 9124AXE-E APs identifies antennas wrongly
• CSCwo76564: Cisco Catalyst 9130, 9136 and 9166 APs display memory leak in ble_transport
• CSCwp07242: Cisco Catalyst 9105 AP stops acking frames due to rxstuck
• CSCwp17376: Cisco Catalyst 9130AXI-C AP's slot 1 does not announce HE capabilities
• CSCwp34935: Cisco Wireless 9176 AP Site Survey mode radio down with country code other than US
• CSCwn55534: IP theft is observed on the controller when the client receives a second DHCP offer following DORA
• CSCwn73024: Cisco Catalyst 9130AX AP fails PKCS certificate enrollment to support special characters on WGB
• CSCwn83397: Wired Mesh AP (MAP) client flaps between VLAN 0 and numbered native VLAN on Root AP (RAP)
• CSCwn88567: Cisco Aironet 1815i AP does not display correct syslog timestamps
• CSCwn92047: Cisco Catalyst 9105 Access Point controller fails to start after reboot when internal AP is configured as 802.1X supplicant
• CSCwn99070: Radio core fails to generate properly causing operational issues
• CSCwo05017: Cisco Catalyst 9162 Access Point experiences out-of-memory reset due to unbounded /tmp usage causing system instability
• CSCwo14129: Wave 2 APs experience unresponsiveness due to soft lockup in version 17.12.4 causing system instability
• CSCwo16038: Cisco Catalyst 9124 AP workgroup Bridge becomes unreachable connecting to Cisco 2800 Root Access Point when Wi-Fi Multimedia (WMM) is disabled
• CSCwo34769: Access point in FlexConnect mode does not advertise RSNxE in probe response frames
• CSCwo37756: Cisco Aironet 1815 AP does not receive an internal DHCP IP address when connected to LAN3
• CSCwo43801: AP duplicates DHCP request packets when using FlexConnect mode with Central Switching WLAN
• CSCwo46493: Cisco Catalyst 9136 AP dual ethernet failover reboots
• CSCwo53891: AP reboots with incorrect reason 'Controller Last Sent: Channel0 Detected'
• CSCwo72236: AP prints logs every 30 seconds: "RTNETLINK answers: No such file or directory"
• CSCwo74316: NTP synchronization failure for AP occurs when the controller is NTP server
• CSCwo75325: SST:17.12.6: Crash due to radio failures (Beacon Stuck) seen on 1832 or 1852 APs
• CSCwo75806: Reassociation Response from AP is delayed for over 200ms on AP WCP component intermittently
• CSCwo75908: MTU value of some APs are not 1600 byte
• CSCwo82821: Cisco Catalyst 9120 Series APs experience kernel panic at txq_hw_fill+0x394
• CSCwo89749: Cisco Catalyst 9105 Series APs reboot due to kernel panic
• CSCwo94810: Cisco Wireless 916x Series, 9130 Series, and 917x Series APs reject association from IoT client TI module
• CSCwp20425: Roaming failure in FlexConnect mode with WPA3-SAE and OKC enabled
• CSCwo14012: AP with filter as tag source remains correctly configured after 2.4 GHz RF profile deletion
• CSCwn66085: Reduce false radar detection in Wi-Fi 6/6E/7 APs</ap>