Stack Switch discovery fails with IRE errorsIssue <!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Stack Switch discovery fails with following IRE errors: Error: In payload missing minimum set of input values for criterion (matching) attributes from identify rule for table [cmdb_ci_hardware]. Add these input values in payload item '{"className":"cmdb_ci_ip_switch","values":{"short_description":"Cisco IOS Software [Dublin], Catalyst L3 Switch Software (CAT9K_LITE_IOSXE), Version 17.12.5, RELEASE SOFTWARE (fc5)\r\nTechnical Support: http://www.cisco.com/techsupport\r\nCopyright (c) 1986-2025 by Cisco Systems, Inc.\r\nCompiled Fri 14-Mar-25 02:48 by xyzuser Stack\ABC123\nStackPort1/1\nStackPort1/2\nStackAdapter1/1\nStackAdapter1/2\nSwi","stack":"true","discovery_source":"ServiceNow","stack_mode":"Slave","name":"ABC-","classifier":"b9d852c60ab3015100c74a8e158664ca","serial_number":"","model_id":"e175e5731b8831105b33844ee54bcbd5","firmware_version":"17.12.5","sys_class_name":"cmdb_ci_ip_switch","manufacturer":"938cf99d1bc655107c47a712f54bcbfe"},"sys_object_source_info" Symptoms<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Stack Switch Discovery fails due to missing Serial Number information Sample payload:,"stack":"true","discovery_source":"ServiceNow","stack_mode":"Slave","name":"ABC","classifier":"b9d852c60ab3015100c74a8e158664ca","serial_number":"","model_id":"e175e5731b8831105b33844ee54bcbd5","firmware_version":"17.12.5","sys_class_name":"cmdb_ci_ip_switch","manufacturer":"938cf99d1bc655107c47a712f54bcbfe"},"sys_object_source_info":{} Release<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Instance enabled with Discovery Resolution<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Rerun discovery and check if serial numbers are fetched for both master and slave switches.Debug Insert Slave CIs data in cmdb_ci_ip_switch for any empty serial numbers (see attached screenshot). If found, verify the entphysicaltable1 pattern step output and correct the missing serial number at the source.Another cause may be a customized, outdated Stacked Switches Library lacking logic to filter slave switches without serial numbers.Revert the Stacked Switches Library to the OOB version.Run Pattern Sync to Mid from the Mid Server table.Rerun discovery and validate.