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This article provides information on addressing issue with incomplete VLAN information collected from devices in device inventory in NCM 7.0 and later.
NCM 7.0 and later
Likely cause is that the VLAN or Extended VLAN information collection is disabled.
When VLAN information is incomplete try these steps:
If the VLANS are still not displaying, confirm with an SNMP walk the device is sending the vlan information based on the RFC IF-MIB.
VLAN information currently is collected on Cisco devices using CISCO-VLAN-MEMBERSHIP-MIB and CISCO-VTP-MIB.