Restrictions for Device Sensor
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Only Cisco Discovery Protocol, LLDP, DHCP, MDNS, SIP, and H323 protocols are supported.
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The session limit for profiling ports is 32.
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The length of one Type-Length-Value (TLV) must not be more than 1024 and the total length of TLVs (combined length of TLVs) of all protocols must not be more than 4096.
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The sensor profiles devices that are only one hop away.
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The Device Sensor feature is enabled by default, but cannot be disabled. Disabling device classifier using no device classifier command in global configuration mode does not disable device sensor. This is because device sensor is independent of IP device tracking and device classifier.
Note
In Cisco IOS Release 15.2(1)E and later releases, you can exclude the protocols so that the Device Sensor feature does not analyze the data. To exclude the protocols, use the device-sensor filter-spec protocol exclude all command in global configuration mode.