Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 186
Media endpoint discovery, Network connectivity device, LLDP-MED capabilities TLV
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Media endpoint discovery LLDP media endpoint discovery (LLDP-MED) provides additional organizationally-specific TLVs to allow endpoint devices and network connectivity devices to advertise their characteristics and configuration information. LLDP-MED endpoint devices are located at the IEEE 802 LAN network edge and participate in IP communication service using the LLDPMED framework, such as IP phones and conference bridges. LLDP-MED network connectivity devices provide access to the IEEE 802based LAN infrastructure for LLDP-MED endpoint devices, such as IP phones. An OS10 device acts as an LLDP-MED network connectivity device. LLDP-MED provides network connectivity devices to: • Manage inventory • Manage PoE • Identify physical location • Identify network policy NOTE: Only the Rx function is supported for managing PoE and identifying the physical location. LLDP-MED is designed for but not limited to VoIP endpoints. Network connectivity device OS10 can acts as an LLDP-MED network connectivity device (Type 4). Network connectivity devices transmit an LLDP-MED capability TLV to endpoint devices and store information that endpoint devices advertise. 127/1 - LLDP-MED capabilities • • • If the transmitting device supports LLDP-MED What LLDP-MED TLVs are supported LLDP device class 127/2 - Network policy 127/3 - Local identification Application type, VLAN ID, L2 priority, and DSCP value. Physical location of the device expressed in one of three formats: • Coordinate-based LCI • Civic address LCI • Emergency call services ELIN 127/4 - Extended Power requirements, priority, and power status. power-via-MDI LLDP-MED capabilities TLV The LLDP-MED capabilities TLV communicates the types of TLVs that the endpoint device and the network connectivity device support. The value of the LLDP-MED capabilities field in the TLV is a 2-octet bitmap. Each bit represents an LLDP-MED capability. LLDP-MED is enabled by default on an interface. If you disable LLDP-MED, use the lldp med enable command to re-enable it on an interface. The device transmits MED PDUs only when it receives a TLV from a peer. The device does not otherwise send PDUs - even if MED is enabled on an interface. 186 Layer 2