Netgear XCM8806 Chassis User Manual - Page 153

NETGEAR 8800 User Manual • The frames are sent as untagged frames. • The frames are sent with a link-local-assigned multicast address as destination address. • The Spanning Tree Protocol (STP) state of the port does not affect the transmission of LLDP frames. The length of the packet cannot exceed 1500 bytes. As you add TLVs, you increase the length of the LLDP frame. When you reach 1500 bytes, the remaining TLVs are dropped. NETGEAR recommends that you advertise information regarding only one or two VLANs on the LLDP port, to avoid dropped TLVs. If the system drops TLVs because of exceeded length, the system logs a message to the EMS and the show lldp statistics commands shows this information under the Tx Length Exceeded field. Note: The LLDPDU has a maximum of 1500 bytes, even with jumbo frames enabled. TLVs that exceed this limit are dropped. Transmitting LLDP Messages In transmit mode, the NETGEAR switch periodically sends out an untagged LLDPDU frame that contains the mandatory LLDP TLVs as well as the configured optional TLVs. The LLDP agent running on the NETGEAR switch passes serially through the list of ports that are enabled for LLDP and periodically transmits an LLDP frame containing the mandatory TLVs and any configured optional TLVs. The mandatory TLVs and the system description TLV are automatically transmitted after you enable LLDP. The following information, when configured, can be sent at regular intervals: • Chassis ID (mandatory) • Port ID (mandatory) • Time-to-live (mandatory) • Port description • System name • System description (sent by default) • System capabilities • Management address • 802.1-specific information • VLAN name • Port VLAN ID • Port and protocol VLAN ID • 802.3-specific information • MAC/PHY Chapter 6. LLDP | 153