diff --git a/snmp/datadog_checks/snmp/data/default_profiles/cisco-catalyst.yaml b/snmp/datadog_checks/snmp/data/default_profiles/cisco-catalyst.yaml
index 5f0f9cc6b4fe0..aa009ccca82fd 100644
--- a/snmp/datadog_checks/snmp/data/default_profiles/cisco-catalyst.yaml
+++ b/snmp/datadog_checks/snmp/data/default_profiles/cisco-catalyst.yaml
@@ -463,3 +463,4 @@ sysobjectid:
   - 1.3.6.1.4.1.9.1.3023 # ciscoC1000FE48T4GL
   - 1.3.6.1.4.1.9.1.3024 # ciscoC1000FE48P4GL
   - 1.3.6.1.4.1.9.1.3069 # ciscoC8500L8S4X
+  - 1.3.6.1.4.1.9.1.3079 # ciscoC9200CX12P2X2G
diff --git a/snmp/datadog_checks/snmp/data/default_profiles/cisco-sb.yaml b/snmp/datadog_checks/snmp/data/default_profiles/cisco-sb.yaml
index 81d79ab64421f..aa712745873f7 100644
--- a/snmp/datadog_checks/snmp/data/default_profiles/cisco-sb.yaml
+++ b/snmp/datadog_checks/snmp/data/default_profiles/cisco-sb.yaml
@@ -5,11 +5,24 @@ extends:
 sysobjectid:
   - 1.3.6.1.4.1.9.6.1.*         # Cisco Small Business
   - 1.3.6.1.4.1.9.6.1.88.26.1   # Cisco SG200-26
+  - 1.3.6.1.4.1.9.6.1.1004.52.5 # Cisco Business 350 (CBS350-48P-4G)
+  # Catalyst 1200/1300 (e.g. C1300-24P-4G) and Cisco Business 350 (CBS350)
+  # run the SMB software stack — not IOS-XE — so they belong here rather
+  # than in cisco-catalyst.yaml, which targets IOS-XE Catalyst chassis.
+  - 1.3.6.1.4.1.9.1.3233        # ciscoC130024P4G (Catalyst 1300 24-port)
 metadata:
   device:
     fields:
       vendor:
         value: "cisco"
+      serial_number:
+        symbol:
+          # ENTITY-MIB: entPhysicalSerialNum at entPhysicalIndex 67109120 — documented
+          # chassis index for Catalyst 1200/1300 and CBS250/350 switches.
+          # Reference: https://www.cisco.com/c/en/us/support/docs/smb/switches/Cisco-Business-Switching/kmgmt3636-snmpv3-common-oids-cbs350.html
+          MIB: ENTITY-MIB
+          OID: 1.3.6.1.2.1.47.1.1.1.1.11.67109120
+          name: entPhysicalSerialNum
 metrics:
   - MIB: CISCOSB-rndMng
     symbol: