PowerConnect B-Series FCX Configuration Guide 68753-1002266-01General operating principles 24• Automatically deploys network policies, such as Layer 2 and Layer 3 QoS policies and VoiceVLANs.• Supports E-911 Emergency Call Services (ECS) for IP telephony• Collects Endpoint inventory information• Network troubleshooting• Helps to detect improper network policy configurationLLDP-MED classAn LLDP-MED class specifies an Endpoint type and its capabilities. An Endpoint can belong to oneof three LLDP-MED class types:• Class 1 (Generic endpoint) – A Class 1 Endpoint requires basic LLDP discovery services, butdoes not support IP media nor does it act as an end-user communication appliance. A Class 1Endpoint can be an IP communications controller, other communication-related server, orother device requiring basic LLDP discovery services.• Class 2 (Media endpoint) – A Class 2 Endpoint supports media streams and may or may not beassociated with a particular end user. Device capabilities include media streaming, as well asall of the capabilities defined for Class 1 Endpoints. A Class 2 Endpoint can be a voice/mediagateway, conference, bridge, media server, etc..• Class 3 (Communication endpoint) – A Class 3 Endpoint supports end user IP communication.Capabilities include aspects related to end user devices, as well as all of the capabilitiesdefined for Class 1 and Class 2 Endpoints. A Class 3 Endpoint can be an IP telephone,softphone (PC-based phone), or other communication device that directly supports the enduser.Discovery services defined in Class 3 include location identifier (ECS/E911) information andinventory management.The LLDP-MED device class is advertised when LLDP-MED is enabled on a port.Figure 116 illustrates LLDP-MED connectivity and supported LLDP-MED classes.General operating principlesLLDP and LLDP-MED use the services of the Data Link sublayers, Logical Link Control and MediaAccess Control, to transmit and receive information to and from other LLDP Agents (protocolentities that implement LLDP).LLDP is a one-way protocol. An LLDP agent can transmit and receive information to and fromanother LLDP agent located on an adjacent device, but it cannot solicit information from anotherLLDP agent, nor can it acknowledge information received from another LLDP agent.Operating modesWhen LLDP is enabled on a global basis, by default, each port on the Dell device will be capable oftransmitting and receiving LLDP packets. You can disable a port’s ability to transmit and receiveLLDP packets, or change the operating mode to one of the following:• Transmit LLDP information only
