HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 370
The LLDP System Descr field maps to CDP's Version and Plat
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Configuring for Network Management Applications LLDP (Link-Layer Discovery Protocol) • The LLDP "System Descr" field maps to CDP's "Version" and "Platform" fields. • The switch assigns "ChassisType" and "PortType" fields as "local" for both the LLDP and the CDP advertisements it receives. • Both LLDP and CDP support the "System Capability" TLV. However, LLDP differentiates between what a device is capable of supporting and what it is actually supporting, and separates the two types of information into subelements of the System Capability TLV. CDP has only a single field for this data. Thus, when CDP System Capability data is mapped to LLDP, the same value appears in both LLDP System Capability fields. • System Name and Port Descr are not communicated by CDP, and thus are not included in the switch's Neighbors database. Note Because ProCurve switches do not generate CDP packets, they are not represented in the CDP data collected by any neighbor devices running CDP. A switch with CDP disabled forwards the CDP packets it receives from other devices, but does not store the CDP information from these packets in its own MIB. LLDP data transmission/collection and CDP data collection are both enabled in the switch's default configuration. In this state, an SNMP network management application designed to discover devices running either CDP or LLDP can retrieve neighbor information from the switch regardless of whether LLDP or CDP is used to collect the device-specific information. Protocol State Packet Generation CDP Enabled1 n/a Inbound Data Management Inbound Packet Forwarding Store inbound CDP data. No forwarding of inbound CDP packets. CDP Disabled n/a No storage of CDP data from Floods inbound CDP packets neighbor devices. from connected devices to outbound ports. LLDP Enabled1 Generatesand Store inbound LLDP data. transmits LLDP packets out all ports on the switch. No forwarding of inbound LLDP packets. LLDP Disabled No packet No storage of LLDP data generation. from neighbor devices. No forwarding of inbound LLDP packets. 13-78